Entity Addresses, Address Type [Axis] Business Contact [Member] Related and Nonrelated Parties [Axis] Nonrelated Party [Member] Related Party [Member] Third Party [Member] Equity Components [Axis] Common Stock [Member] Subscription Receivable [Member] Additional Paid-in Capital [Member] Statutory Reserve [Member] Retained Earnings [Member] AOCI Attributable to Parent [Member] Parent [Member] Noncontrolling Interest [Member] Ownership [Axis] Leishen Energy Holding Co Ltd [Member] Sale of Stock [Axis] IPO [Member] Over-Allotment Option [Member] Investment, Name [Axis] Leishen Energy Group Holding Co Ltd Leishen Holding Hong Kong [Member] Leishen Energy Holding Co Ltd Leishen Cayman [Member] Leishen Energy Group Co Ltd Leishen Hong Kong [Member] ZJY Technologies Co Ltd ZJY Technologies [Member] China Oil Blue Ocean Petroleum Technology Inc China Oil Blue Ocean [Member] Leishen Energy Technology Nanjing Co Ltd Leishen Nanjing [Member] Leishen Green Energy Technology Development Co Ltd Beijing Leishen Green Energy [Member] Leishen Energy Technology Shandong Co Ltd Leishen Shandong [Member] Leishen Energy Services Co Ltd Leishen Services [Member] Sichuan Leishen Hongzhuo Energy Development Co Ltd Sichuan Leishen Hongzhuo [Member] Sichuan Huayou Huitong New Material Co Ltd Huayou Huitong [Member] Xinjiang Breslin Oil And Gas Service Co Ltd Xinjiang Breslin [Member] Lionize Engineering Technology Limited. [Member] China Oil Blue Ocean Hydrogen Energy Technology Co.,Ltd. [Member] Suqian Hanmo Energy Service Co..Ltd. [Member] Lse Energy International Co Ltd [Member] Lse Energy America Inc [Member] Huayou Huiton and Sichuan Leishen Hongzhuo [Member] Plan Name [Axis] Employee Contribution Plans [Member] Award Type [Axis] CNY [Member] Long-Lived Tangible Asset [Axis] Office Equipment [Member] Statistical Measurement [Axis] Minimum [Member] Maximum [Member] Vehicles [Member] Machinery and Equipment [Member] Software Development [Member] Fair Value Hierarchy and NAV [Axis] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Product and Service [Axis] Sales Of Clean Energy Equipment [Member] Sales of Digitalization and Integration Equipment [Member] Sales Of New Energy [Member] Delivery Of Oil And Gas Engineering Technical Services [Member] Concentration Risk Benchmark [Axis] Revenue Benchmark [Member] Concentration Risk Type [Axis] Customer Concentration Risk [Member] Customer [Axis] Customer A [Member] Customer B [Member] Customer C [Member] Customer D [Member] Customer [Member] Accounts Receivable [Member] Customer E [Member] Vendor A [Member] Vendor B [Member] Vendor [Member] Accounts Payable [Member] Vendor C [Member] Asset Class [Axis] Trading Assets, Excluding Debt and Equity Securities [Member] Equity Securities [Member] Related Party Transaction [Axis] Beijing Youyi Natural Technology Co., Ltd. [Member] Sichuan Zhuoyue Shuxin Technology Co., Ltd. [Member] Sichuan Jiahongyi Information Technology Consulting Co., Ltd. [Member] Title and Position [Axis] Sichuan TIBO [Member] Jining Eni Energy Technology Co Ltd [Member] Sichuan Leishen Hongzhuo Energy Development Co Ltd [Member] Legal Entity [Axis] Shuifu Yongcheng [Member] Sichuan Shunengwei Energy Development Co Ltd [Member] China Oil Blue Ocean Petroleum Technology Inc [Member] Finite-Lived Intangible Assets by Major Class [Axis] Debt Instrument [Axis] Polar Petroleum Equipment (Shandong) Co., Ltd [Member] Sichuan TIBO Fluid Technology Co Ltd [Member] Xianlong Technology (Beijing) Co., Ltd. [Member] Joseph Petroleum Technology (Beijing) Co., Ltd. [Member] Beiiing Chenghui Shengsi Technology Co Ltd [Member] Accrued Interest Receivable [Member] ZJY Technologies [Member] Beijing Chenghui Shengsi Technology Co., Ltd [Member] China Oil Blue Ocean [Member] Subsequent Event Type [Axis] Subsequent Event [Member] Eni Energy [Member] Xinjiang Breslin [Member] Joseph Petroleum [Member] Long-Term Debt, Type [Axis] Bank of China [Member] Industrial and Commercial Bank One [Member] Industrial and Commercial Bank Two [Member] Shenzhen Qianhai Webank One [Member] Shenzhen Qianhai Webank Two [Member] Bank Of China Chengdu Zijing West Road Subbranch One [Member] Bank Of China Chengdu Zijing West Road Subbranch Two [Member] Industrial and Commercial Bank of China Beijing Yayuncun Subbranch One [Member] Industrial and Commercial Bank of China Beijing Yayuncun Subbranch Two [Member] Sichuan Leishen Hongzhuo [Member] Nanjing Lishui Technology Development Co Ltd [Member] Li Honglinag [Member] Shuifu Yongcheng Technology Co Ltd [Member] Li Hongqi [Member] Li Hongliang [Member] Sichuan Hongzhuo Shuya Energy Co Ltd [Member] Li Hongguang [Member] Equipment Sales to Sichuan TIBO Fluid Technology Co Ltd [Member] LNG/CNG Sales To Hongzhuo Shuya Energy Co Ltd [Member] Sichuan TIBO Fluid Technology Co Ltd (Lessor) [Member] Consolidated Entities [Axis] Beijing Leishen Green Energy [Member] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Equity Transaction Agreements [Member] Chengdu Jiajiaqi Technology Co., Ltd [Member] Lei Huaping [Member] Huayou Huitong [Member] PRC Subsidiaries [Member] Non controlling Interests [Member] Geographical [Axis] CHINA China Oil Blue Ocean and ZJY Technologies [Member] Segments [Axis] Saleof Clean Energy Equipment [Member] Saleof Digitalization And Integration Equipment [Member] Saleof New Energy [Member] Cleaning Energy Equipment [Member] Digitalization and Integration Equipment [Member] New Energy [Member] Oil and Gas Field Engineering Technical Services [Member] Other Corporate Assets [Member] Class of Stock [Axis] Common Class A [Member] Common Class B [Member] Polar Energy Company Limited [Member] Wise Power Energy Services Co Ltd [Member] China Oil Blue Ocean Energy Equipment(Sichuan)Co.,Ltd (China Oil Blue Ocean Energy) [Member] Parent Company [Member] Entity Addresses [Table] Entity Addresses [Line Items] Document Type Amendment Flag Amendment Description Document Registration Statement Document Annual Report Document Quarterly Report Document Transition Report Document Shell Company Report Document Shell Company Event Date Document Period Start Date Document Period End Date Document Fiscal Period Focus Document Fiscal Year Focus Current Fiscal Year End Date Entity File Number Entity Registrant Name Entity Central Index Key Entity Primary SIC Number Entity Tax Identification Number Entity Incorporation, State or Country Code Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Three Entity Address, City or Town Entity Address, State or Province Entity Address, Country Entity Address, Postal Zip Code Country Region City Area Code Local Phone Number Extension Written Communications Soliciting Material Pre-commencement Tender Offer Pre-commencement Issuer Tender Offer Title of 12(b) Security No Trading Symbol Flag Trading Symbol Security Exchange Name Title of 12(g) Security Security Reporting Obligation Annual Information Form Audited Annual Financial Statements Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Elected Not To Use the Extended Transition Period Document Accounting Standard Other Reporting Standard Item Number Entity Shell Company Entity Public Float Entity Bankruptcy Proceedings, Reporting Current Entity Common Stock, Shares Outstanding Documents Incorporated by Reference [Text Block] Contact Personnel Name Contact Personnel Email Address Entity Listing, Par Value Per Share Document Financial Statement Error Correction [Flag] Auditor Firm ID Auditor Name Auditor Location Defined Benefit Plan [Table] Defined Benefit Plan Disclosure [Line Items] ASSETS Current Assets: Cash Restricted cash Short-term investments Accounts receivable, net Notes receivable Advance to suppliers, net Inventories Loan receivable - related party Prepaid expenses and other current assets, net Due from related parties Total current assets Non-current assets: Long-term investments Non-current accounts receivable Deferred offering costs Property and equipment, net Intangible assets Operating lease right-of-use assets, net Loans receivable, non-current Deferred tax assets, net Other non-current assets Total non-current assets Total Assets LIABILITIES AND EQUITY Current Liabilities: Short-term loans Accounts payable Advance from customers Taxes payable Due to related parties Operating lease liabilities Other payables and other current liabilities Total current liabilities Non-current Liabilities: Long-term loans Deferred tax liabilities, net Operating lease liabilities, non-current Total non-current liabilities Total Liabilities Commitments and Contingencies Equity: Ordinary shares (par value $0.001 per share, 50,000,000 shares authorized; 17,025,000 and 15,500,000 shares issued and outstanding as of September 30, 2025 and 2024, respectively Subscription receivable Additional paid-in capital Statutory reserves Retained earnings Accumulated other comprehensive loss Total equity attributable to Leishen Energy Holding Co., Ltd Non-controlling interests Total Equity Total Liabilities and Equity Statement of Financial Position [Abstract] Ordinary shares, par value Ordinary shares, shares authorized Ordinary shares, shares issued Ordinary shares, shares outstanding Revenues: Total revenues Cost of revenues Gross profit Operating expenses: Selling and marketing General and administrative Provision for expected credit losses Research and development Total operating expenses (Loss) income from operations Other income: Interest expense Exchange gains (loss) Income from equity investments Income from short-term investments Interest income from loan receivable Loss from disposal of property and equipment Gain on disposal of equity investments Loss from deregistration of a subsidiary Other income, net Total other income, net Income before income taxes Income tax (benefit) expense Net income Less: net income (loss) attributable to non-controlling interests Net income attributable to Leishen Energy Holding Co., Ltd Comprehensive income Net income Foreign currency translation (loss) gain Total comprehensive income Less: comprehensive income (loss) attributable to non-controlling interests Comprehensive income attributable to Leishen Energy Holding Co., Ltd Earnings per ordinary share Basic diluted Weighted average number of ordinary shares outstanding Basic diluted Statement [Table] Statement [Line Items] Balance Balance, shares Shareholders capital withdrawal Cash contribution from shareholders Net income (loss) Appropriation to statutory reserve Foreign currency translation adjustment Cash withdrawal by a shareholder Purchase of minority interest Shares issued in initial public offering Shares issued in initial public offering, shares Balance Balance, shares Statement of Cash Flows [Abstract] Cash flows from operating activities: Adjustments to reconcile net income to net cash (used in) provided by operating activities: Depreciation and amortization Loss on disposal of property and equipment Changes in fair value of short-term investments Provision for expected credit losses of receivables and advances to suppliers Gain on disposal of equity investment Loss from deregistration of a subsidiary Loss (income) from equity investment Non-cash lease expense Deferred income tax Changes in operating assets and liabilities: Accounts receivable Notes receivable Advance to suppliers Inventories Due from related parties Prepaid expenses and other current assets Accounts payable Advance from customers Taxes payable Due to related parties Other payables and other current liabilities Lease liabilities Net cash (used in) provided by operating activities Cash flows from investing activities: Purchase of property and equipment Proceeds from disposal of property and equipment Proceeds on disposal of equity investment Proceeds on disposal of subsidiaries Loan to a related party Loans to third parties Purchases of intangible assets Purchase of short-term investments Maturity of short-term investments Purchase of long-term investments Net cash used in investing activities Cash flows from financing activities: Proceeds from short-term loans Repayments of short-term loans Repayments of long-term loans Net proceeds from initial public offering Payment of offering cost Payment for purchasing minority interests Cash contribution from non-controlling shareholders Cash withdrawal by a non-controlling shareholder Net cash provided by (used in) financing activities Effect of foreign exchange rate on cash Net increase (decrease) in cash and restricted cash Cash and restricted cash at the beginning of the year Cash and restricted cash at the end of the year Reconciliation of cash and restricted cash Cash Restricted cash Total cash and restricted cash shown in the statements of cash flows Supplemental disclosures of cash flow information: Income taxes paid Interest paid Non-cash transactions: Operating right-of-use assets recognized for related operating lease liabilities Shareholders’ capital withdrawal recognized as an increase in due to related parties Reclassification of deferred offering cost Transfer of self-produced products from inventories to property and equipment Contribution of inventories to fulfill a funding obligation Pay vs Performance Disclosure [Table] Executive Category [Axis] Individual [Axis] Adjustment to Compensation [Axis] Measure [Axis] Pay vs Performance Disclosure, Table Company Selected Measure Name Named Executive Officers, Footnote Peer Group Issuers, Footnote Changed Peer Group, Footnote PEO Total Compensation Amount PEO Actually Paid Compensation Amount Adjustment To PEO Compensation, Footnote Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Compensation Actually Paid Amount Adjustment to Non-PEO NEO Compensation Footnote Equity Valuation Assumption Difference, Footnote Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Company Selected Measure Total Shareholder Return Vs Peer Group Compensation Actually Paid vs. Other Measure Tabular List, Table Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net Income (Loss) Company Selected Measure Amount Other Performance Measure, Amount Adjustment to Compensation, Amount PEO Name Name Non-GAAP Measure Description Additional 402(v) Disclosure Pension Benefits Adjustments, Footnote Equity Awards Adjustments, Footnote Erroneously Awarded Compensation Recovery [Table] Restatement Determination Date [Axis] Restatement Determination Date Aggregate Erroneous Compensation Amount Erroneous Compensation Analysis Stock Price or TSR Estimation Method Outstanding Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Not Yet Determined Name Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery, Explanation of Impracticability Name Compensation Amount Restatement does not require Recovery Awards Close in Time to MNPI Disclosures [Table] Award Timing MNPI Disclosure Award Timing Method Award Timing Predetermined Award Timing MNPI Considered Award Timing, How MNPI Considered MNPI Disclosure Timed for Compensation Value Awards Close in Time to MNPI Disclosures, Table Name Underlying Securities Exercise Price Fair Value as of Grant Date Underlying Security Market Price Change Trading Arrangements, by Individual [Table] Trading Arrangement [Axis] Material Terms of Trading Arrangement Name Title Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted Adoption Date Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated Termination Date Expiration Date Arrangement Duration Aggregate Available Insider Trading Policies and Procedures [Line Items] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Not Adopted Cybersecurity Risk Management, Strategy, and Governance [Abstract] Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block] Cybersecurity Risk Management Processes Integrated [Flag] Cybersecurity Risk Management Processes Integrated [Text Block] Cybersecurity Risk Management Third Party Engaged [Flag] Cybersecurity Risk Third Party Oversight and Identification Processes [Flag] Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag] Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block] Cybersecurity Risk Board of Directors Oversight [Text Block] Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block] Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block] Cybersecurity Risk Role of Management [Text Block] Cybersecurity Risk Management Positions or Committees Responsible [Flag] Cybersecurity Risk Management Positions or Committees Responsible [Text Block] Cybersecurity Risk Management Expertise of Management Responsible [Text Block] Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block] Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag] Material Cybersecurity Incident [Abstract] Material Cybersecurity Incident Nature [Text Block] Material Cybersecurity Incident Scope [Text Block] Material Cybersecurity Incident Timing [Text Block] Material Cybersecurity Incident Material Impact or Reasonably Likely Material Impact [Text Block] Material Cybersecurity Incident Information Not Available or Undetermined [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] ORGANIZATION AND BUSINESS DESCRIPTION Accounting Policies [Abstract] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Short-term Investments SHORT-TERM INVESTMENTS Credit Loss [Abstract] ACCOUNTS RECEIVABLE, NET Receivables [Abstract] NOTES RECEIVABLE Advance To Suppliers Net ADVANCE TO SUPPLIERS, NET Inventory Disclosure [Abstract] INVENTORIES Prepaid Expenses And Other Current Assets Net PREPAID EXPENSES AND OTHER CURRENT ASSETS, NET Investments, All Other Investments [Abstract] LONG-TERM INVESTMENTS, NET Property, Plant and Equipment [Abstract] PROPERTY AND EQUIPMENT, NET Goodwill and Intangible Assets Disclosure [Abstract] INTANGIBLE ASSETS, NET Loans Receivable LOANS RECEIVABLE Debt Disclosure [Abstract] BANK LOANS Payables and Accruals [Abstract] OTHER PAYABLES AND OTHER CURRENT LIABILITIES Lease LEASE Related Party Transactions [Abstract] RELATED PARTY BALANCES AND TRANSACTIONS Equity [Abstract] EQUITY Income Tax Disclosure [Abstract] TAXES Commitments and Contingencies Disclosure [Abstract] COMMITMENTS AND CONTINGENCIES Segment Reporting [Abstract] SEGMENT INFORMATION Subsequent Events [Abstract] SUBSEQUENT EVENTS Condensed Financial Information Disclosure [Abstract] PARENT COMPANY INFORMATION Basis of presentation Principles of consolidation Non-controlling interests Use of estimates Foreign Currency Translation Cash Restricted Cash Short-term Investments Accounts Receivable, net Notes Receivable Advance to Suppliers, net Inventories Loans Receivable Property and Equipment, net Intangible Assets, net Fair Value of Financial Instruments Long-term Investments Lease Restricted Net Assets Revenue Recognition Cost of Revenues General and Administrative Expenses Selling and Marketing Expenses Research and Development Expenses Interest Expenses Other Income, net Mainland China Employee Contribution Plans Income Taxes Value Added Tax (“VAT”) Earnings Per Share Comprehensive Income Segment Reporting Related Parties Recent accounting pronouncement SCHEDULE OF COMPANY AND SUBSIDIARIES SCHEDULE OF FOREIGN CURRENCY TRANSLATION SCHEDULE OF ESTIMATED USEFUL LIFE SCHEDULE OF AMORTIZATION OF INTANGIBLE ASSETS SCHEDULE OF FAIR VALUE MEASUREMENT ON RECURRING BASIS SCHEDULE OF BREAKDOWN OF REVENUES SCHEDULE OF CONCENTRATIONS SCHEDULE OF SHORT TERM INVESTMENT SCHEDULE OF NET INVESTMENT INCOME SCHEDULE OF ACCOUNTS RECEIVABLE SCHEDULE OF ALLOWANCE FOR EXPECTED CREDIT LOSSES SCHEDULE OF ADVANCE TO SUPPLIERS, NET SCHEDULE OF MOVEMENT OF ALLOWANCE FOR CREDIT LOSS ADVANCE TO SUPPLIER SCHEDULE OF INVENTORIES SCHEDULE OF PREPAID EXPENSES AND OTHER CURRENT ASSETS SCHEDULE OF ALLOWANCE FOR CREDIT LOSSES SCHEDULE OF LONG-TERM INVESTMENTS SCHEDULE OF EQUITY INVESTMENTS ACCOUNTED FOR USING THE EQUITY METHOD SCHEDULE OF PROPERTY, PLANT, AND EQUIPMENT SCHEDULE MOVEMENT OF MACHINERY AND EQUIPMENT SCHEDULE OF INTANGIBLE ASSETS SCHEDULE OF LOAN RECEIVABLE SCHEDULE OF BANK LOANS SCHEDULE OF OTHER PAYABLES AND OTHER CURRENT LIABILITIES SCHEDULE OF OPERATING LEASE RELATED ASSETS AND LIABILITIES SCHEDULE OF WEIGHTED AVERAGE OF OPERATING LEASE SCHEDULE OF OPERATING LEASE COST SCHEDULE OF MATURITY OF OPERATING LEASE LIABILITIES SCHEDULE OF RELATED PARTY TRANSACTIONS SCHEDULE OF NON - CONTROLLING INTERESTS SCHEDULE OF INCOME BEFORE PROVISION FOR INCOME TAXES SCHEDULE OF PROVISION FOR INCOME TAX SCHEDULE OF STATUTORY RATE OF EFFECTIVE TAX RATE SCHEDULE OF COMPONENTS OF DEFERRED TAX ASSETS AND LIABILITIES SCHEDULE OF TAXES PAYABLE SCHEDULE OF OPERATING SEGMENT INFORMATION SCHEDULE OF PARENT COMPANY BALANCE SHEETS SCHEDULE OF PARENT COMPANY STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME SCHEDULE OF PARENT COMPANY STATEMENTS OF CASH FLOWS ScheduleOfCompanyAndSubsidiariesTable [Table] ScheduleOfCompanyAndSubsidiariesLineItems [Line Items] Date of Incorporation Percentage of effective ownership Principal activities Consolidation, Less-than-Wholly-Owned Subsidiary, Parent Ownership Interest, Effect of Change [Table] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Date of incorporation Ownership interest Number of shares issued Share price per share Gross proceeds from issuance of ordinary shares Number of shares issued and sold Net proceeds from issuance of ordinary shares AccountingPoliciesTable [Table] Insurance limit Loans receivables percenatge Impairment Impairment on lease Expenses Value added tax percentage Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Foreign currency exchange rate translation Foreign currency exchange rate translation Property, Plant and Equipment [Table] Property, Plant and Equipment [Line Items] Estimated useful lives (in years) Platform Operator, Crypto Asset [Table] Platform Operator, Crypto Asset [Line Items] Trading securities Held-to-maturity securities Total Nature of Operation, Product Information, Concentration of Risk [Table] Product Information [Line Items] Reveues Percentage of reveues Total Concentration risk percentage Impairment Effects on Earnings Per Share [Table] Impairment Effects on Earnings Per Share [Line Items] Total short-term investments Schedule Of Net Investment Income Gain from redemption of wealth management products investments Unrealized gain from wealth management products investments Unrealized gain from common stocks Net investment income Trading securities Trade accounts receivable Less: allowance for expected credit losses Total accounts receivable, net Current portion Non-current portion Balance at beginning of the year Current year addition Exchange differences Balance at end of the year Notes receivable Schedule Of Advance To Suppliers Net Advance for products and services from third parties Less: allowance for expected credit losses Advance to suppliers, net Schedule Of Movement Of Allowance For Credit Loss Advance To Supplier Balance at beginning of the year Current year addition Exchange differences Balance at end of the year Raw materials Work in progress Self-produced products Purchased products - clean-energy equipment Purchased products - digitalization and integration equipment Total inventories Equipment transferred from inventories Schedule Of Prepaid Expenses And Other Current Assets Deposits Staff advances VAT Credit to be deducted Advanced service fee Equity transaction   Other Less: allowance against advanced service fee Prepaid expenses and other current assets, net DisclosurePrepaidExpensesAndOtherCurrentAssetsNetTable [Table] Advance service fee Equity transaction percentage Schedule Of Allowance For Credit Losses Balance at beginning of the year Current year addition Foreign exchange difference Balance at end of the year Equity method investments, net Equity investments using the measurement alternative Long-term investment, net InvestmentsAllOtherInvestmentsTable [Table] InvestmentsAllOtherInvestmentsLineItems [Line Items] Equity interest, rate Equity method investment Realized gain Proportion of existing shares transferred, description Balance at the beginning of the year Additions Share of results of equity investees Effect of foreign currency translation Disposal of equity interests Total Property and equipment, gross Less: accumulated depreciation Property and equipment, net Balance at the beginning of the year Purchases Equipment transferred from inventories Disposals Exchange differences Balance at the end of the year Depreciation Intangible Asset, Finite-Lived [Table] Finite-Lived Intangible Assets [Line Items] Software Less: accumulated amortization Intangible assets, net Amortization Short-Term Debt [Table] Short-Term Debt [Line Items] Total loans Less: current portion Credit facility Interest, rate Debt instrument term Debt repaid Debt outstanding, repaid Interest accrued Loan receivable related party Loan repaid Loan, current Loan balance Schedule of Long-Term Debt Instruments [Table] Debt Instrument [Line Items] Principal Amount Annual Interest Rate Contract term Total loans Current portion Long-term loans Long term debt Repayments of debt Payroll payable Deposits Other Other payables and other current liabilities Schedule Of Operating Lease Related Assets And Liabilities Operating lease ROU assets Operating lease liabilities - current Operating lease liabilities - non-current Total operating lease liabilities Schedule Of Weighted Average Of Operating Lease Weighted-average remaining lease term Weighted-average discount rate Operating lease cost Cash paid for operating leases 2026 2027 2028 2029 After 2029 Total lease payments Less: Imputed Interest Present value of operating lease liabilities Operating lease, description Lessee operating lease term of contract Lease rental payment Renewal term Lease terminated Related Party Transaction [Table] Related Party Transaction [Line Items] Amount due from related party Loan receivable from a related party Amount due to related parties Revenues Factory lease Purchase of equipment Purchase of fixed assets Additional paid in capital Repayments of related party Interest, current Repaid amount Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Paid-in capital Deficit Total non-controlling interests Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Subsidiary, Sale of Stock [Line Items] Gross proceeds from issuance of ordinary shares Net proceeds from underwriting discounts and commissions Percentage of equity interest Purchase price Restricted net assets IncomeBeforeProvisionForIncomeTaxTable [Table] IncomeBeforeProvisionForIncomeTaxLineItems [Line Items] Income before provision for income taxes ProvisonForIncomeTaxTable [Table] ProvisonForIncomeTaxLineItems [Line Items] Current Current Deferred Deferred Income tax (benefit) expense Income tax at expected tax rates Additional deduction of research and development expenses Non-deductible expenses Effect of PRC preferential tax rates Non-PRC entities not subject to PRC tax Other Change of valuation allowance Effective tax rate Change in Unrecognized Tax Benefit, Reasonably Possible [Table] Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] Reduction in income tax rate Deferred tax assets Allowance for expected credit losses Impairment of a long-term investment Unbilled cost Net operating loss carryforwards Total deferred tax assets Deferred tax liabilities Unbilled revenue Long-term investment gain of equity method Other Total deferred tax liabilities Net deferred tax assets Net deferred tax liabilities VAT payable Income taxes payable Other Total Description of enterprise income tax Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting Information [Line Items] Total segment profit (gross profit)  Selling and marketing expenses  General and administrative expenses  Provision for expected credit losses  Research and development expenses  Total operating expenses (Loss) income from operations Other income, net Income before income taxes Total assets Other corporate assets Total assets related to reportable segments Elimination of intercompany balances Total consolidated assets Reportable segments Subsequent Event [Table] Subsequent Event [Line Items] Authorized share capital Ordinary shares, outstanding Ordinary shares, voting rights ScheduleOfParentyCompanyBalanceSheetsTable [Table] ScheduleOfParentyCompanyBalanceSheetsLineItems [Line Items] Cash and cash equivalents Amounts due from a subsidiary Investment in subsidiaries LIABILITIES COMMITMENTS AND CONTINGENCIES EQUITY Ordinary shares (par value $0.001 per share, 50,000,000 shares authorized; 17,025,000 and 15,500,000 shares issued and outstanding as of September 30, 2025 and 2024, respectively.) Additional paid-in capital Statutory reserves ScheduleOfParentyCompanyBalanceSheetsParentheticalTable [Table] ScheduleOfParentyCompanyBalanceSheetsParentheticalLineItems [Line Items] ScheduleOfParentyCompanyOperationsAndComprehensiveIncomeTable [Table] ScheduleOfParentyCompanyOperationsAndComprehensiveIncomeLineItems [Line Items] Equity in earnings of subsidiaries Other income: Other income, net Foreign currency translation (loss) gain ScheduleOfParentyCompanyCashFlowsTable [Table] ScheduleOfParentyCompanyCashFlowsLineItems [Line Items] Cash flows from operating activities Net income Adjustments to reconcile net income to net cash provided by operating activities: Equity in earnings of subsidiaries Changes in other receivables from a subsidiary Description of enterprise income tax. Schedule Of Income Before Provision For Income Taxes [Table Text Block] Current year addition. Exchange differences. Selfproduced products. Shenzhen Qianhai Webank One [Member] Purchased products for cleanenergy equipment. Purchased products for digitalization and integration equipment. Shenzhen Qianhai Webank Two [Member] Prepaid Expense And Other Current Assets Disclosure [Text Block] Bank Of China Chengdu Zijing West Road Subbranch One [Member] Bank Of China Chengdu Zijing West Road Subbranch Two [Member] Effective income tax rate reconciliation income tax at expected tax rates. Effective income tax rate reconciliation additional deduction of research and development. Effective income tax rate reconciliation effect of prc preferential tax rates. Effective income tax rate reconciliation non prc entities not subject to prc tax. Bank of China [Member] Industrial and Commercial Bank One [Member] Industrial and Commercial Bank Two [Member] Deposits current. Advances to staff current. Advanced service fee current. Allowance for expected credit losses. China Oil Blue Ocean and ZJY Technologies [Member] Equity transaction current. Deferred tax assets allowance for expected credit losses. Deferred tax assets unbilled cost. Deferred tax liability unbilled revenue. Deferred tax liability long term investment gain of equity method. Schedule of Allowance For Credit Losses [Table Text Block] Schedule of Taxes Payable [Table Text Block] Value added taxes payable current. Income taxes payable. Other taxes payable current. Advance to suppliers net. Industrial and Commercial Bank of China Beijing Yayuncun Subbranch One [Member] Clean Energy Equipment [Member] Digitalization and Integration Equipment [Member] Beijing Youyi Natural Technology Co., Ltd. [Member] New Energy Production And Operation [Member] Oil And Gas Engineering Technical Services [Member] Sichuan Zhuoyue Shuxin Technology Co., Ltd. [Member] Sichuan Jiahongyi Information Technology Consulting Co., Ltd. [Member] Industrial and Commercial Bank of China Beijing Yayuncun Subbranch Two [Member] Loan receivable non current. Schedule of Balance Sheet Information Related Operating Lease [Table Text Block] Sichuan TIBO [Member] Nanjing Lishui Technology Development Co Ltd [Member] Advance from customers. Statutory reserve. Sichuan Leishen Hongzhuo [Member] Sichuan TIBO Fluid Technology Co Ltd [Member] Li Honglinag [Member] Schedule of Weighted Average of Operating Lease [Table Text Block] Equity investments in measurement alternative. Jining Eni Energy Technology Co Ltd [Member] Lessee operating lease liability payments due after year four. Sichuan Leishen Hongzhuo Energy Development Co Ltd [Member] Shuifu Yongcheng [Member] Proportion of existing shares transferred description. Sichuan Shunengwei Energy Development Co Ltd [Member] ZJY Technologies [Member] Equity method investments additions. Equity method investments equity investees. Equity method investments effect of foreign currency translation. Equity method investments disposal of equity interests. Li Hongqi [Member] Li Hongliang [Member] China Oil Blue Ocean Petroleum Technology Inc [Member] Lessor operating factory lease. Polar Energy Company Limited [Member] Wise Power Energy Services Co Ltd [Member] Interest income from loan receivable. China Oil Blue Ocean Petroleum Technology Inc China Oil Blue Ocean [Member] Beijing Leishen Green Energy [Member] China Oil Blue Ocean Energy Equipment(Sichuan)Co.,Ltd (China Oil Blue Ocean Energy) [Member] Subscription Receivable [Member] China Oil Blue Ocean [Member] Statutory Reserve [Member] Huayou Huitong [Member] PRC Subsidiaries [Member] Schedule Of Machinery And Equipment [Table Text Block] Cash withdrawal by a shareholder. Schedule of noncontrolling interest [Table Text Block] Purchase of machinery and equipment. Transferred from inventory. Disposal of machinery and equipment. Machinery and equipment exchange differences. Amount issued in initial public offering. Total number of common shares of an entity that have been issued and sold. Gain loss on changes in fair value of short term investments. Non cash lease expense. Increase decrease in advance to suppliers. Increase decrease in advance from customers. Statutory reserves. Payments to maturity of short term investments. Payments for purchase of long term investments. Proceeds from deferred offering cost. Cash contributions from non-controlling shareholders. Proceeds from cash withdrawal by noncontrolling shareholder. Amounts due from subsidiary. Equity in earnings of subsidiaries. Equity Transaction Agreements [Member] Chengdu Jiajiaqi Technology Co., Ltd [Member] Lei Huaping [Member] Shareholders capital withdrawal recognized as increase in due to related parties. Schedule of Loans Receivable [Table Text Block] Reclassification of deferred offering cost. Shares issued in initial public offering. Loans receivable. Polar Petroleum Equipment (Shandong) Co., Ltd [Member] Xianlong Technology (Beijing) Co., Ltd. [Member] Joseph Petroleum Technology (Beijing) Co., Ltd. [Member] Accrued Interest Receivable [Member] Loan receivable related party. Leishen Energy Holding Co Ltd [Member] Schedule of Company and Subsidiaries [Table Text Block] Leishen Energy Holding Co Ltd Leishen Cayman [Member] Non controlling Interests [Member] Leishen Energy Group Holding Co Ltd Leishen Holding Hong Kong [Member] Leishen Energy Group Co Ltd Leishen Hong Kong [Member] ZJY Technologies Co Ltd ZJY Technologies [Member] Leishen Energy Technology Nanjing Co Ltd Leishen Nanjing [Member] Leishen Green Energy Technology Development Co Ltd Beijing Leishen Green Energy [Member] Leishen Energy Technology Shandong Co Ltd Leishen Shandong [Member] Leishen Energy Services Co Ltd Leishen Services [Member] Sichuan Leishen Hongzhuo Energy Development Co Ltd Sichuan Leishen Hongzhuo [Member] Sichuan Huayou Huitong New Material Co Ltd Huayou Huitong [Member] Xinjiang Breslin Oil And Gas Service Co Ltd Xinjiang Breslin [Member] Principal activities. Disclosure loans receivables text block. Lionize Engineering Technology Limited. [Member] China Oil Blue Ocean Hydrogen Energy Technology Co.,Ltd. [Member] Suqian Hanmo Energy Service Co..Ltd. [Member] Eni Energy [Member] Non Controlling Interests [Policy Text Block] CNY [Member] Foreign currency exchange rate translation. Short Term Investments [Policy Text Block] Advance To Suppliers Net [Policy Text Block] Xinjiang Breslin [Member] Property Plant And Equipment Estimated Useful Lives [Text Block] Joseph Petroleum [Member] Long Term Investments [Policy Text Block] Beijing Chenghui Shengsi Technology Co., Ltd [Member] Restricted Net Assets [Policy Text Block] Sales Of Clean Energy Equipment [Member] Sales of Digitalization and Integration Equipment [Member] Sales Of New Energy [Member] Delivery Of Oil And Gas Engineering Technical Services [Member] Revenue breakdown percentage. Cost Of Revenues [Policy Text Block] Selling And Marketing Expenses [Policy Text Block] Other Income Net [Policy Text Block] Employee Contribution Plans [Policy Text Block] Employee Contribution Plans [Member] Value Added Tax [Policy Text Block] Value added tax percentage. Customer A [Member] Customer B [Member] Customer C [Member] Customer D [Member] Customer [Member] Customer E [Member] Vendor A [Member] Vendor B [Member] Vendor C [Member] Related Parties [Policy Text Block] Short Term Investment [Text Block] Income (loss) from sales of short-term investments. Short Term Investment [Table Text Block] Vendor [Member] Gain on disposal of equity investment. Loans receivable net current. Operating right of use assets recognized for related operating lease liabilities. Loans to third parties. Stock issued purchase minority interest. Shuifu Yongcheng Technology Co Ltd [Member] Li Hongguang [Member] Sichuan Hongzhuo Shuya Energy Co Ltd [Member] Equipment Sales to Sichuan TIBO Fluid Technology Co Ltd [Member] Third Party [Member] Sichuan TIBO Fluid Technology Co Ltd (Lessor) [Member] Allowance for doubtful accounts receivable current year addition. Allowance for doubtful accounts receivable current foreign exchange difference. Huayou Huiton and Sichuan Leishen Hongzhuo [Member] Stock issued during period value appropriation to statutory reserve. Deferred tax assets, net. Transfer of selfproduced products from inventories to property and equipment Loan receivable percenatge Unrealized gain from wealth management products investments. Advance for products and services from third parties. Advance To Suppliers [Table Text Block] Allowance for expected credit losses advance to suppliers. Advance To Suppliers Allowance For Credit Losses [Table Text Block] Current year addition advance to suppliers. Foreign exchange difference advance to suppliers. LNG CNG Sales To Hongzhuo Shuya Energy Co Ltd [Member] Advance To Suppliers [Text Block] Provision for expected credit losses Beiiing Chenghui Shengsi Technology Co Ltd [Member] Contribution of Inventories to Fulfill Funding Obligation Lse Energy International Co Ltd [Member] Lse Energy America Inc [Member] Other Segment [Member] Direct Labor Costs [Member] Depreciation of Production Equipment [Member] Cost of Raw Materials and Purchased Products [Member] Segment assets Cleaning Energy High-End Equipment [Member] Oil and Gas Field Engineering Technical Services [Member] Other Unallocated Amounts [Member] Elimination of receivables from corporate headquarters Other unallocated amounts Number of reportable segments Income from short-term investments Prepaid expenses and other current assets net Due to related parties Assets, Current Assets, Noncurrent Liabilities, Current Liabilities, Noncurrent Common Stock, Share Subscribed but Unissued, Subscriptions Receivable Equity, Attributable to Parent Equity, Including Portion Attributable to Noncontrolling Interest Liabilities and Equity Cost of Revenue Operating Expenses Interest Expense, Nonoperating Nonoperating Income (Expense) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Parent Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Diluted Shares, Outstanding Gain (Loss) on Disposition of Assets GainLossOnChangesInFairValueOfShorttermInvestments GainOnDisposalOfEquityInvestment Gain (Loss) on Investments Increase (Decrease) in Accounts and Other Receivables Increase (Decrease) in Notes Receivable, Current Increase (Decrease) in Inventories Increase (Decrease) in Due from Related Parties, Current Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Accounts Payable IncreaseDecreaseInAdvanceFromCustomers Increase (Decrease) in Accrued Taxes Payable Increase (Decrease) in Due to Related Parties Increase (Decrease) in Other Current Liabilities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Payments to Acquire Property, Plant, and Equipment Payments for (Proceeds from) Loans Receivable PaymentsForProceedsFromLoansReceivableToThirdParties Payments to Acquire Intangible Assets Payments to Acquire Short-Term Investments PaymentsForPurchaseOfLongtermInvestments Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Repayments of Short-Term Debt Repayments of Long-Term Debt Payments of Ordinary Dividends, Noncontrolling Interest Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Forgone Recovery, Individual Name Outstanding Recovery, Individual Name Awards Close in Time to MNPI Disclosures, Individual Name Trading Arrangement, Individual Name Non Controlling Interests [Policy Text Block] Cash and Cash Equivalents, Policy [Policy Text Block] Short Term Investments [Policy Text Block] Inventory, Policy [Policy Text Block] Mortgage Banking Activity [Policy Text Block] Lessee, Leases [Policy Text Block] ForeignCurrencyExchangeRateTranslation Investment Income, Net Accounts Receivable, Allowance for Credit Loss Accounts Receivable, after Allowance for Credit Loss Proceeds from Collection of Notes Receivable Allowance for expected credit losses advance to suppliers CurrentYearAdditionAdvanceToSuppliers ExchangeDifferenceAdvanceToSuppliers AllowanceForExpectedCreditLosses Prepaid Expense and Other Assets, Current Accounts Receivable, Allowance for Credit Loss, Current AllowanceForDoubtfulAccountsReceivableCurrentYearAddition Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Machinery and Equipment, Gross MachineryAndEquipmentExchangeDifferences Finite-Lived Intangible Assets, Accumulated Amortization Loans Payable Loans Payable, Noncurrent Deposit Liability, Current Accrued Liabilities and Other Liabilities Accounts Payable and Other Accrued Liabilities, Current Lessee, Operating Lease, Liability, to be Paid Lessee, Operating Lease, Liability, Undiscounted Excess Amount Current Income Tax Expense (Benefit) Effective income tax rate reconciliation additional deduction of research and development EffectiveIncomeTaxRateReconciliationEffectOfPrcPreferentialTaxRates EffectiveIncomeTaxRateReconciliationNonprcEntitiesNotSubjectToPrcTax Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent Effective Income Tax Rate Reconciliation, Percent Deferred Tax Assets, Net of Valuation Allowance DeferredTaxLiabilityUnbilledRevenue DeferredTaxLiabilityLongTermInvestmentGainOfEquityMethod Deferred Tax Liabilities, Other Deferred Tax Liabilities, Gross OtherTaxesPayableCurrent StatutoryReserves Other Nonoperating Income Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent Increase (Decrease) in Other Receivables