Document and Entity Information Statement [Table] Entity Addresses, Address Type [Axis] Address Type [Domain] Business Contact Class of Stock [Axis] Class of Stock [Domain] Ordinary Shares Common Class A [Member] Common Class A Class A ordinary shares Common Class B [Member] Common Class B Class B ordinary shares Statement Statement Document Type Document Registration Statement Document Annual Report Document Transition Report Document Shell Company Report Document Period End Date Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Contact Personnel Email Address Entity Address, Country Entity Address, Address Line One Entity Address, Address Line Two Entity Address, City or Town Entity Address, Postal Zip Code Country Region City Area Code Local Phone Number Contact Personnel Name Title of 12(b) Security Trading Symbol Security Exchange Name Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Emerging Growth Company Entity Ex Transition Period Document Financial Statement Error Correction [Flag] Entity Shell Company ICFR Auditor Attestation Flag Document Accounting Standard Entity Common Stock, Shares Outstanding Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Auditor Name Auditor Firm ID Auditor Location Consolidated Balance Sheets Related Party, Type [Axis] Related Party, Type [Domain] Nonrelated Party [Member] Nonrelated party Related Party [Member] Related party Assets [Abstract] ASSETS Assets, Current [Abstract] CURRENT ASSETS: Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalent Cash and cash equivalents Restricted Cash, Current Restricted Cash Accounts Receivable, after Allowance for Credit Loss, Current Accounts receivable, net Accounts receivable, net Amounts due from bank as evidenced by a written promise to pay, due within 1 year (or 1 business cycle). Bank Acceptance Notes Receivable Bank acceptance notes receivable Bank acceptance receivable Inventory, Net Inventories, net Total inventory Prepaid Supplies Prepayment to suppliers, net Amount of investments in trading securities classified as current. Investment In Trading Securities Investment in trading securities Other Assets, Current Other current assets Total other current assets Assets, Current TOTAL CURRENT ASSETS It represents the value of property plant and equipment excluding construction in progress, net. Property and Plant Equipment, Excluding Construction In Progress, Net Property and equipment, net Property and equipment, net Construction in Progress, Gross Construction in progress Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Goodwill Goodwill Long-term Investments Long term investment Operating Lease, Right-of-Use Asset Operating lease right of use assets Total operating lease assets Deferred Income Tax Assets, Net Deferred tax assets The amount of Prepayments for property and equipment. Prepayment for property and equipment Prepayments for property and equipment Other Assets, Noncurrent Other long term assets Assets TOTAL ASSETS Liabilities, Current [Abstract] CURRENT LIABILITIES: Current liabilities: Loans Payable to Bank, Current Bank loans Accrued Insurance, Current Insurance premium payables Accounts Payable, Current Accounts payable Contract with Customer, Liability, Current Contract liabilities Advance from customers Amount of current deferred government grants. Deferred Government Grants, Current Deferred government grants-current Deferred government grants - current Taxes Payable, Current Taxes payable Total Operating Lease, Liability, Current Current operating lease liabilities Operating lease liabilities, current Other Liabilities, Current Due to related party Other Liability, Current, Related Party [Extensible Enumeration] Accrued Liabilities and Other Liabilities Accrued expenses and other payables Accrued expenses and other payables Liabilities, Current TOTAL CURRENT LIABILITIES Liabilities, Noncurrent [Abstract] LONG TERM LIABILITIES Operating Lease, Liability, Noncurrent Operating lease liabilities, noncurrent Non-current operating lease liabilities Amount of non-current deferred government grants. Deferred Government Grants, Non-Current Deferred government grants - noncurrent Liabilities TOTAL LIABILITIES Commitments and contingencies Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] SHAREHOLDERS' EQUITY: Common Stock, Value, Issued Ordinary Shares, $0.00833335 par value, 5,030,000,000 and 100,000,000 shares authorized, 200,623,358 and 7,226,480 Ordinary Shares, consisting of 180,623,358 and 7,226,480 Class A ordinary shares, par value US$0.00833335 per share, and 20,000,000 Class B ordinary shares, par value US$0.00833335 per share, as of September 30, 2025 and 2024 respectively Additional Paid in Capital Additional paid-in capital Amount of statutory reserve. Statutory Reserve. Statutory Reserve Retained Earnings (Accumulated Deficit) Accumulated (deficit) earnings Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive profit (loss) Stockholders' Equity Attributable to Parent Total shareholders' equity attributable to BGM Group Ltd. Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interests Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance as of ending Balance as of beginning TOTAL SHAREHOLDERS' EQUITY Liabilities and Equity TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Common Stock, Par or Stated Value Per Share Ordinary Shares, par value (in dollar per share) Par value Common Stock, Shares Authorized Ordinary Shares, shares authorized Common Stock, Shares, Issued Ordinary Shares, shares issued Common Stock, Shares, Outstanding Balance as of ending (in shares) Balance as of beginning (in shares) Ordinary Shares, shares outstanding Consolidated Statements of Operations and Comprehensive Income (Loss) Revenue from Contract with Customer, Excluding Assessed Tax NET REVENUE Revenue Cost of Revenue COST OF REVENUE Cost of revenue Gross Profit Gross Profit GROSS PROFIT Selling, General and Administrative Expense SELLING, GENERAL AND ADMINISTRATIVE Research and Development Expense Research and development expense RESEARCH AND DEVELOPMENT EXPENSES Operating Income (Loss) LOSS FROM OPERATIONS Interest Income (Expense), Net Interest income (expense), net Amount of investment gain (loss). Investment Gain Loss Investment loss Equity Method Investment, Realized Gain (Loss) on Disposal Loss on disposal of Long term investment Loss on disposal of long term investment Loss on disposal of Long term investment Amount of investments in share of results of associates. Investments In Share of Results of Associates Share of results of associates Share of results of associates The amount of grant income. Grant Income Grant income Other Nonoperating Income (Expense) Other Income (expenses) Nonoperating Income (Expense) Total other expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest LOSS BEFORE INCOME TAX PROVISION (loss) Income from operations Income Tax Expense (Benefit) INCOME TAX EXPENSE/(BENEFIT) Total Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss NET LOSS Net loss for the year Net Income (Loss) Attributable to Noncontrolling Interest Less: net loss attributable to non-controlling interest NET LOSS ATTRIBUTABLE TO BGM Group Ltd. Net (loss) income Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] OTHER COMPREHENSIVE LOSS Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation adjustment Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest COMPREHENSIVE LOSS Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Less: comprehensive loss attributable to non - controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent COMPREHENSIVE LOSS ATTRIBUTABLE TO BGM Group Ltd. Earnings Per Share, Basic Earnings (loss) per common share - basic (in dollar per share) Earnings (loss) per share - basic Earnings Per Share, Diluted Earnings (loss) per common share - diluted (in dollar per share) Earnings (loss) per share - diluted Weighted Average Number of Shares Outstanding, Basic Weighted average shares - basic (in shares) Weighted Average Number of Shares Outstanding, Diluted Weighted average shares - diluted (in shares) Weighted-average number of ordinary shares outstanding - diluted Consolidated Statements of Changes in Shareholders' Equity Equity Components [Axis] Equity Component [Domain] Additional Paid-in Capital Retained Deficit and Earnings Representing member information pertaining to statutory reserve. Statutory Reserve Accumulated Other Comprehensive Profit (Loss) The Shareholders' Equity Attributable to BGM Group Ltd Non-controlling Interests Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Stock Issued During Period, Value, New Issues Issuance of common shares Stock Issued During Period, Shares, New Issues Issuance of common shares (in shares) Value of shares issued during the period to stock options granted to employees. Stock Issued During Period, Value, Stock Options Granted to Employees Stock options granted to employees Number of shares issued during the period to stock options granted to employees. Stock Issued During Period, Shares, Stock Options Granted to Employees Stock options granted to employees (in shares) Amount of appropriations to statutory reserve from retained earnings. Appropriations To Statutory Reserve Appropriation for statutory reserve Consolidated Statements of Cash flows Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Operating Lease, Right-of-Use Asset, Amortization Expense Non-cash operating lease expenses Depreciation and amortization Share-Based Payment Arrangement, Noncash Expense Stock based compensation Accounts Receivable, Credit Loss Expense (Reversal) Credit loss for accounts receivable Addition Provision for Other Credit Losses Provision (reverse) for other receivables Other Cost and Expense, Operating Allowance for ATV Aggregate amount of write-off charged during the period for property, plant and equipment. Impairment Of Property And Equipment Impairment of property and equipment Inventory, LIFO Reserve, Effect on Income, Net Inventories provision (reserve) Deferred Income Tax Expense (Benefit) Deferred tax expense (benefit) Marketable Securities, Unrealized Gain (Loss) Unrealized loss from investment in securities Investment Income, Net Investment (income) Gain (Loss) on Disposition of Assets Property and equipment written off Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Insurance Liabilities Insurance premium payables The increase (decrease) during the reporting period of the amounts due from bank evidenced by a note. Increase Decrease In Bank Acceptance Notes Receivable Bank acceptance notes receivable Increase (Decrease) in Inventories Inventories Increase (Decrease) in Prepaid Supplies Prepayment to suppliers Increase (Decrease) in Other Current Assets Other current assets Increase (Decrease) in Accounts Payable, Trade Accounts payable Increase (Decrease) in Contract with Customer, Liability Contract liabilities Amount of increase (decrease) in deferred government grants. Increase (Decrease) in Deferred Government Grants Deferred government grants Increase (Decrease) in Income Taxes Payable Taxes payable Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Accrued expenses and other payables The increase (decrease) during the reporting period pertaining to operating lease liabilities. Increase (Decrease) in Operating Lease Liabilities Lease liabilities Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment It represents the value of payments for construction in progress. Payments for Construction in Progress Payment for construction in progress Payments to Acquire Intangible Assets Purchase of intangible assets Proceeds from Sale of Long-Term Investments Cash received from disposal of Long term investment Cash Acquired from Acquisition Cash received from acquisition Proceeds from Equity Method Investment, Distribution, Return of Capital Dividend received Payments to Acquire Short-Term Investments Payment for short term investment Proceeds from Sale, Maturity and Collection of Short-Term Investments Proceeds from short term investment Payments to Acquire Long-Term Investments Payments on long term investment Proceeds from Sale and Maturity of Marketable Securities Proceeds from Sale and Maturity of Marketable Securities Redemption from marketable securities Represents the information pertaining to acquisition of non-controlling interest. Acquisition Of Non-controlling Interest Purchase of non controlling interest Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from (Repayments of) Lines of Credit Proceeds from bank loans