Related and Nonrelated Parties [Axis] Total current Assets Total non-current assets Total assets Total current Liabilities Total non-current liabilities Total Liabilities Total shareholder’s equity Total liabilities and shareholders’ equity Gross profit Total costs and operating expenses GAIN (LOSS) FROM OPERATIONS Total other income (loss), net PROFIT (LOSS) BEFORE INCOME TAX EXPENSES NET INCOME (LOSS) Net income (loss) attributable to FST Corp.’s shareholders TOTAL COMPREHENSIVE INCOME (LOSS ) Comprehensive income (loss) attributable to FST Corp.’s shareholders Net cash used in investing activities Net cash used in financing activities Net increase in cash and cash equivalents Cash, cash equivalents and restricted cash at the beginning of period Cash, cash equivalents and restricted cash at the end of period Document Type Document Fiscal Year Focus Entity File Number Entity Registrant Name Entity Central Index Key Amendment Flag Document Period End Date Document Fiscal Period Focus Current Fiscal Year End Date Current assets Cash and cash equivalents Restricted cash Accounts and notes receivable, net Prepaid tax Inventories, net Amounts due from a related party Prepaid expenses and other current assets Non-current assets Property, plant and equipment, net Intangible assets, net Long-term investments Right-of-use assets Deferred tax assets, net Prepayment and other non-current assets LIABILITIES Current liabilities Short-term bank borrowings Accounts payables Operating lease liabilities, current Amounts due to related parties Current tax liabilities Accrued expenses and other current liabilities Non-current liabilities Long-term bank borrowings Operating lease liabilities, non-current OET derivative liability Warrant liabilities SHAREHOLDERS’ EQUITY Ordinary share (par value of US$0.0001 per share; 500,000,000 shares authorized; 44,766,003 shares issued and outstanding) Ordinary share, par value (in Dollars per share) Ordinary share, shares authorized (in Shares) Ordinary share, shares issued (in Shares) Ordinary share, shares outstanding (in Shares) Additional paid in capital Retained earnings Accumulated other comprehensive loss Total FST Corp. shareholder’s equity Non-controlling interests Revenue Cost of sales COSTS AND OPERATING EXPENSES: Selling expenses General and administrative expenses Research and development expenses OTHER INCOME (EXPENSE) Foreign exchange gain Other income, net Unrealized loss on change in fair value of OET derivative liability INCOME TAX EXPENSES Less: net income(loss) attributable to non-controlling interests OTHER COMPREHENSIVE LOSS Less: total comprehensive income (loss) attributable to non-controlling interests Weighted average number of shares outstanding, basic (in Shares) Weighted average number of shares outstanding, diluted (in Shares) Earnings per share, basic (in Dollars per share) Earnings loss per share, diluted (in Dollars per share) CASH FLOWS FROM OPERATING ACTIVITIES: Net cash provided by operating activities CASH FLOWS FROM INVESTING ACTIVITIES: CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from bank borrowings Effect of foreign exchange rate on cash, cash equivalents and restricted cash SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: Interest expenses paid Income taxes paid Right of use assets obtained in exchange for operating lease obligations Interest expense, net Foreign currency translation adjustment Purchase of property, plant and equipment Purchase of intangible assets Repayments of bank borrowings Related Party Related and Nonrelated Parties [Domain] Statement [Table] Statement [Line Items] Statement of Cash Flows [Abstract] Restricted Cash, Current Earnings Per Share, Diluted Liabilities, Noncurrent [Abstract] Common Stock, Value, Issued Nonoperating Income (Expense) [Abstract] Prepaid Taxes Operating Lease, Liability, Current Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Selling, General and Administrative Expense Weighted Average Number of Shares Outstanding, Basic Unrealized Gain (Loss) on Derivatives Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Liabilities, Current [Abstract] Short-Term Bank Loans and Notes Payable Long-Term Debt, Excluding Current Maturities Proceeds from Bank Debt Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Other Nonoperating Income (Expense) Other Comprehensive Income (Loss), Tax [Abstract] Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Deferred Income, Current Deferred Income Tax Assets, Net Gain (Loss) on Sale of Investments Derivative Liability, Noncurrent Income Tax Expense (Benefit) Income Statement [Abstract] Assets, Noncurrent Equity, Attributable to Parent Operating Expenses [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax Revenues Related Party [Member] Earnings Per Share, Basic Liabilities, Noncurrent Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Warrants and Rights Outstanding Supplemental Cash Flow Information [Abstract] Assets Liabilities Accounts Payable and Other Accrued Liabilities, Current Equity, Attributable to Parent [Abstract] Other Receivables, Net, Current Research and Development Expense General and Administrative Expense Repayments of Bank Debt Comprehensive Income (Loss), Net of Tax, Attributable to Parent Current Fiscal Year End Date Common Stock, Par or Stated Value Per Share Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Operating Costs and Expenses Document Fiscal Year Focus Common Stock, Shares, Issued Common Stock, Shares, Outstanding Other Liabilities, Current Net Income (Loss) Available to Common Stockholders, Basic Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Weighted Average Number of Shares Outstanding, Diluted Intangible Assets, Net (Excluding Goodwill) Prepaid Expense and Other Assets, Current Gross Profit Additional Paid in Capital, Common Stock Net Income (Loss) Attributable to Noncontrolling Interest Payments to Acquire Property, Plant, and Equipment Accounts Receivable, after Allowance for Credit Loss, Current Accounts Payable, Current Interest Paid, Excluding Capitalized Interest, Operating Activity Equity, Including Portion Attributable to Noncontrolling Interest Payments for (Proceeds from) Short-Term Investments Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Assets, Current [Abstract] Property, Plant and Equipment, Net Long-Term Investments Document Fiscal Period Focus Liabilities, Current Statement of Financial Position [Abstract] Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Common Stock, Shares Authorized Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Document Type Interest Expense, Nonoperating Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Operating Lease, Liability, Noncurrent Entity File Number Amendment Flag Document Period End Date Operating Income (Loss) Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Cost of Revenue Cash Equivalents, at Carrying Value Entity Central Index Key Prepaid Expense and Other Assets, Noncurrent Equity, Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Liabilities and Equity Nonoperating Income (Expense) Liabilities [Abstract] Income Taxes Paid Assets, Noncurrent [Abstract] Retained Earnings (Accumulated Deficit) Income (Loss) Attributable to Parent, before Tax Inventory, Net Entity Registrant Name Assets, Current Operating Lease, Right-of-Use Asset