75000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 75010 - Statement - Unaudited Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 75020 - Statement - Unaudited Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 75030 - Statement - Unaudited Condensed Consolidated Statements of Operations link:presentationLink link:calculationLink link:definitionLink 75040 - Statement - Unaudited Condensed Consolidated Statements of Comprehensive (Loss) Income link:presentationLink link:calculationLink link:definitionLink 75050 - Statement - Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 75060 - Statement - Unaudited Condensed Consolidated Statements of Changes in Equity link:presentationLink link:calculationLink link:definitionLink 75070 - Statement - Unaudited Condensed Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 995455 - Disclosure - Business link:presentationLink link:calculationLink link:definitionLink 995465 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 995475 - Disclosure - Balance Sheet Components link:presentationLink link:calculationLink link:definitionLink 995485 - Disclosure - Investments in Unconsolidated Entities link:presentationLink link:calculationLink link:definitionLink 995495 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 995505 - Disclosure - Stock-based Compensation link:presentationLink link:calculationLink link:definitionLink 995515 - Disclosure - Net Loss Per Share of Common Stock link:presentationLink link:calculationLink link:definitionLink 995525 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 995535 - Disclosure - Related Party Transactions link:presentationLink link:calculationLink link:definitionLink 995545 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 995555 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 995565 - Disclosure - Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 995575 - Disclosure - Balance Sheet Components (Tables) link:presentationLink link:calculationLink link:definitionLink 995585 - Disclosure - Investments in Unconsolidated Entities (Tables) link:presentationLink link:calculationLink link:definitionLink 995595 - Disclosure - Commitments and Contingencies (Tables) link:presentationLink link:calculationLink link:definitionLink 995605 - Disclosure - Stock-based Compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 995615 - Disclosure - Net Loss Per Share of Common Stock (Tables) link:presentationLink link:calculationLink link:definitionLink 995625 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 995635 - Disclosure - Business (Details) link:presentationLink link:calculationLink link:definitionLink 995645 - Disclosure - Summary of Significant Accounting Policies - Basis of Presentation and Use of Estimates (Details) link:presentationLink link:calculationLink link:definitionLink 995655 - Disclosure - Summary of Significant Accounting Policies - Others (Details) link:presentationLink link:calculationLink link:definitionLink 995665 - Disclosure - Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) link:presentationLink link:calculationLink link:definitionLink 995675 - Disclosure - Summary of Significant Accounting Policies - Noncontrolling Interests (Details) link:presentationLink link:calculationLink link:definitionLink 995685 - Disclosure - Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) link:presentationLink link:calculationLink link:definitionLink 995695 - Disclosure - Balance Sheet Components - Inventories (Details) link:presentationLink link:calculationLink link:definitionLink 995705 - Disclosure - Balance Sheet Components - Property, Plant and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 995715 - Disclosure - Balance Sheet Components - Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 995725 - Disclosure - Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 995735 - Disclosure - Investments in Unconsolidated Entities (Details) link:presentationLink link:calculationLink link:definitionLink 995745 - Disclosure - Commitments and Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 995755 - Disclosure - Commitments and Contingencies (Details) 2 link:presentationLink link:calculationLink link:definitionLink 995765 - Disclosure - Stock-based Compensation (Details) link:presentationLink link:calculationLink link:definitionLink 995775 - Disclosure - Net Loss Per Share of Common Stock (Details) link:presentationLink link:calculationLink link:definitionLink 995785 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 995795 - Disclosure - Related Party Transactions (Details) link:presentationLink link:calculationLink link:definitionLink Proceeds from Sale of Property, Plant, and Equipment Proceeds from sales of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment, Total Income (Loss) from Continuing Operations before Income Taxes, Foreign Foreign operations Concentration Risk Type [Axis] Concentration Risk Type Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Conversion of convertible notes principal and interest. Conversion of Convertible Notes Principal and Interest Conversion of convertible notes principal and interest Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accounts Payable, Total Long-Term Debt, Excluding Current Maturities Long-term debt, excluding current installments Long-Term Debt, Excluding Current Maturities, Total Entity Current Reporting Status Entity Current Reporting Status Operating Expenses [Abstract] Operating expenses: Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Common Stock, Shares Authorized Common stock, shares authorized Product and Service [Axis] Document Fiscal Period Focus Document Fiscal Period Focus Unsecured convertible promissory notes payable. Unsecured Convertible Promissory Notes Payable [Member] Unsecured Convertible Promissory Notes Payable Debt Instrument, Interest Rate, Stated Percentage Loan agreement, rate of interest Entity Shell Company Entity Shell Company Common shares purchased form non-controlling interest by non-controlling interest. Common Shares Purchased From Minority Interest By Non Controlling Interest Common shares purchased form non-controlling interests Cash and Cash Equivalent Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total OCI, Foreign Currency Transaction and Translation Gain (Loss), Arising During Period, Tax Foreign currency translation adjustments tax Common Stock, Shares, Issued Common stock, shares issued Lessee, Operating Lease, Description Operating lease agreements, description Statement [Table] Statement [Table] Restricted Cash, Noncurrent Restricted Cash, Noncurrent Noncontrolling Interest [Table] Minority Interest [Table] Statement [Line Items] Statement [Line Items] Entity Filer Category Entity Filer Category Liabilities and Equity TOTAL LIABILITIES AND EQUITY Long-Term Debt, Current Maturities Current installments of long-term debt Long-Term Debt, Current Maturities, Total Largest shareholder. Largest Shareholder [Member] Largest Shareholder Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset Equity Method Investments Dissolution Of Investee Equity method investments dissolution of investee. Dissolution of investee Dissolution of investee Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent U.S. federal income tax rate (as a percent) Shares Issued, Price Per Share Closing price per share Income Taxes Paid Cash paid for income taxes Geographical [Domain] Geographical Payments to Acquire Intangible Assets Payments for development of intangible assets Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Equivalents Represents information pertaining to Taiwan Bandaoti Zhaoming Co., Ltd. formerly known as Silicon Base Development, Inc., a wholly-owned subsidiary of the entity. Taiwan Bandaoti Zhaoming Co Ltd [Member] Taiwan Bandaoti Zhaoming Co., Ltd. Schedule of Inventory, Current [Table Text Block] Schedule of inventories Additional Paid in Capital, Common Stock Additional paid-in capital Loan agreement. Loan Agreement [Member] Loan Agreement Common Stock To Be Issued [Member] Common Stock To Be Issued Common Stock To Be Issued Property, Plant and Equipment [Line Items] Property Plant And Equipment [Line Items] Carrying value as of the balance sheet date of liabilities incurred and payable for business expenses. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, if longer). Accrued Business Expenses Current Accrued business expenses Concentration Risk [Table] Concentration Risk [Table] Currency [Axis] Currency Investment, Name [Axis] Investment, Name Earnings Per Share, Basic Basic Earnings Per Share, Basic, Total Commitments and contingencies. Commitments And Contingencies [Line Items] Commitments and Contingencies Repayments of Long-Term Debt Repayments of long-term debt Repayments of Long-Term Debt, Total Stock Issued Issuance of common stock to repay long-term loan Interest Income (Expense), Nonoperating Interest expenses, net Liabilities, Current Total current liabilities Accounts receivable Increase (Decrease) in Accounts Receivable Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Inventory, Finished Goods, Net of Reserves Finished goods Represents information pertaining to SemiLEDs Optoelectronics Co. Ltd., formerly Semi-Photonics Co., Ltd. (Taiwan SemiLEDs), a wholly-owned subsidiary of the entity. Semi L E Ds Optoelectronics Company Limited [Member] Taiwan SemiLEDs Product Concentration Risk [Member] Product Concentration Equity, Attributable to Parent [Abstract] SHAREHOLDERS' EQUITY: Entity Small Business Entity Small Business Increase (Decrease) in Accrued Liabilities Accrued expenses and other current liabilities Increase (Decrease) in Accrued Liabilities, Total Retained Earnings (Accumulated Deficit) Accumulated deficit Retained Earnings (Accumulated Deficit), Total Transfer from Investments Conversion of convertible notes payable to common stock Income taxes. Income Taxes [Line Items] Income Taxes [Line Items] Nature of Operations [Text Block] Business Geographic Concentration Risk [Member] Geographic Concentration Commitments and contingencies. Commitments And Contingencies [Table] Commitments And Contingencies [Table] Share-Based Payment Arrangement [Text Block] Stock-based Compensation Represents the maximum period of the standard product warranty liability. Standard Product Warranty Period Maximum Maximum warranty period Organization, Consolidation and Presentation of Financial Statements [Abstract] Amendment Flag Amendment Flag Product and Service [Domain] Chief Executive Officer [Member] Chairman And Chief Executive Officer Chairman And Chief Executive Officer Concentration Risk [Line Items] Concentration Risk [Line Items] Liabilities and Equity [Abstract] LIABILITIES AND EQUITY Entity Address, Postal Zip Code Entity Address, Postal Zip Code Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Net cash used in operating activities Net cash used in operating activities Net cash provided by operating activities Common Stock [Member] Common Stock Lessee, Operating Lease, Liability, to be Paid, Year Three 2029 Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less: Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Entity Address, Address Line One Entity Address, Address Line One Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] Earnings Per Share [Abstract] Net (loss) income per share attributable to SemiLEDs stockholders: SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Equity Securities without Readily Determinable Fair Value, Amount Equity investment without readily determinable fair value Equity investment without readily determinable fair value - Ending Balance Equity investment without readily determinable fair value - Beginning Balance Operating Lease, Right-of-Use Asset Operating lease right of use assets Operating lease right of use assets Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Per Employee Maximum grant limit per employee per one year period Less: Net (loss) income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest, Total Less: Net income attributable to noncontrolling interests Insurance Coverage Limit by Central Deposit Insurance Corporation (C D I C) Insurance coverage limit by Central Deposit Insurance Corporation (CDIC). Insurance coverage limit by CDIC Document Type Document Type Gross Profit Gross profit Gross profits (losses) on product sales Subsidiary, Ownership Percentage, Parent Ownership interest (as a percent) Entity Central Index Key Entity Central Index Key Accounts Receivable, Allowance for Credit Loss, Current Allowance for doubtful accounts Maximum threshold percentage which the entity uses for disclosure. Maximum Threshold For Disclosure Percentage Maximum percentage of total accrued expenses and other current liabilities Maximum percentage of total net revenues Restricted Cash and Cash Equivalent [Abstract] Restricted Cash and Cash Equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive securities (in shares) Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) United States of America, Dollars U.S. Dollars Liabilities [Abstract] Liabilities Parent [Member] Total SemiLEDs Shareholders' Equity Repayments of Related Party Debt Related party loan repayment amount Stock units and stock options to purchase common stock. Stock Units And Stock Options To Purchase Common Stock [Member] Stock units and stock options to purchase common stock Lessee operating lease liability payments due after year four. Lessee Operating Lease Liability Payments Due After Year Four Thereafter Total Accrued Liabilities, Current Accrued expenses and other current liabilities Disclosure of accounting policy for noncontrolling interest in consolidated subsidiaries. Minority Interest Policy [Text Block] Noncontrolling Interests Cost of Sales [Member] Cost of revenues Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Stock-based Compensation Ownership [Domain] Ownership Current Fiscal Year End Date Current Fiscal Year End Date Payments to Noncontrolling Interests Acquisition of noncontrolling interests Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Investments in unconsolidated entities Total investments in unconsolidated entities Document Quarterly Report Document Quarterly Report Stock Issued During Period, Value, Conversion of Convertible Securities Conversion of convertible notes payable to common stock Investment, Name [Domain] Investment, Name Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive (loss) income attributable to SemiLEDs stockholders Common Stock, Capital Shares Reserved for Future Issuance Common stock available for future issuance (in shares) Geographical [Axis] Geographical Payments for Operating Activities [Abstract] Cash Paid for amounts Included In Measurement of Liabilities: Summary of the stock-based compensation expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive loss, net of tax: Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Additional number of shares authorized for issuance Other Assets, Noncurrent Other assets Antidilutive Securities [Axis] Antidilutive Securities Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Vesting percentage Basis of Presentation and Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Other Machinery and Equipment [Member] Other equipment Related Party Transaction [Axis] AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income Customer [Domain] Customer Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name Trung Doan. Trung Doan [Member] Trung Doan Selling, General and Administrative Expense Selling, general and administrative Selling, General and Administrative Expense, Total Debt Instrument, Maturity Date Debt instrument , maturity date Employees. Employees [Member] Employees Minimum [Member] Minimum Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Grant-date fair value (in dollars per share) Assets, Current [Abstract] CURRENT ASSETS: Disclosure of accounting policy for reporting when there is a substantial doubt about an entity's ability to continue as a going concern for a reasonable period of time (generally a year from the balance sheet date). Disclose: (a) pertinent conditions and events giving rise to the assessment of substantial doubt about the entity's ability to continue as a going concern for a reasonable period of time, (b) the possible effects of such conditions and events, (c) management's evaluation of the significance of those conditions and events and any mitigating factors, (d) possible discontinuance of operations, (e) management's plans (including relevant prospective financial information), and (f) information about the recoverability or classification of recorded asset amounts or the amounts or classification of liabilities. If management's plans alleviate the substantial doubt about the entity's ability to continue as a going concern, disclosure of the principal conditions and events that initially raised the substantial doubt about the entity's ability to continue as a going concern would be expected to be considered. Disclose whether operations for the current or prior years generated sufficient cash to cover current obligations, whether waivers were obtained from creditors relating to the company's default under the provisions of debt agreements and possible effects of such conditions and events, such as: whether there is a possible need to obtain additional financing (debt or equity) or to liquidate certain holdings to offset future cash flow deficiencies. Disclose appropriate parent company information when parent is dependent upon remittances from subsidiaries to satisfy its obligations. Going Concern Policy Policy [Text Block] Going Concern The entire disclosure for equity investment, or group of investments, for which combined disclosure is appropriate, including: (a) the name of each investee and percentage of ownership of common stock, (b) accounting policies for investments in common stock, (c) difference between the amount at which the investment is carried and the amount of underlying equity in net assets and the accounting treatment of the difference, (d) the total fair value of each identified investment for which a market value is available, (e) summarized information as to assets, liabilities, and results of operations of the investees (for investments in unconsolidated subsidiaries, common stock of joint ventures, or other investments using the equity method), and (f) material effects of possible conversions, exercises, or contingent issuances of the investee. Other disclosures include (a) the names of any investee in which the investor owns 20 percent or more of the voting stock and investment is not accounted for using the equity method, and the reasons why not, and (b) the names of any investee in which the investor owns less than 20 percent of the voting stock and the investment is accounted for using the equity method, and the reasons why it is. It also includes certain corporate joint ventures are partially owned by the reporting entity or its wholly-owned subsidiaries, and certain noncontrolled corporations where reporting entities can exercise significant influence over the operating and financial policies of joint ventures. Such investments are accounted for under the equity and cost method of accounting. Equity And Cost Method Investments Disclosure [Text Block] Investments in Unconsolidated Entities Disclosure of accounting policy for significant risks and uncertainties. Significant Risks And Uncertainties Policy [Text Block] Certain Significant Risks and Uncertainties Represents the number of wholly owned subsidiaries of the entity as on balance sheet date. Number Of Wholly Owned Subsidiaries Number of wholly owned subsidiaries Liabilities, Current [Abstract] CURRENT LIABILITIES: Related Party Transactions [Abstract] Shares, Outstanding BALANCE (in shares) BALANCE (in shares) Accounts Receivable, after Allowance for Credit Loss, Current Accounts Receivable, after Allowance for Credit Loss, Current, Total Accounts receivable (including related parties), net of allowance for doubtful accounts of $177 and $180 as of February 28, 2026 and August 31, 2025, respectively Income taxes. Income Taxes [Table] Income Taxes [Table] Restricted Cash and Cash Equivalent Restricted cash and cash equivalents Restricted Cash and Cash Equivalents, Total Restricted Cash Equivalent, Current Restricted Cash Equivalents, Current Commitments and Contingencies Commitments and contingencies (Note 5) Operating Lease, Liability Present value of future minimum lease payments Total Inventory, Work in Process, Net of Reserves Work in process Simplot Taiwan Inc Simplot Taiwan Inc [Member] Simplot Taiwan Inc [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark Stock-based compensation expense Allocated Share Based Compensation Expense Reverse Allocated share based compensation expense (reverse). Capital Expenditures Incurred but Not yet Paid Accrual related to property, plant and equipment Income (loss) before income taxes Net (loss) income Net (loss) income Net loss Weighted Average Number of Shares Outstanding, Basic Basic Weighted Average Number of Shares Outstanding, Basic, Total Non-Rule 10b5-1 Arr Modified Flag Non-Rule 10b5-1 Arr Modified Flag. Non-Rule 10b5-1 Arrangement Modified Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset Subsequent Events [Text Block] Subsequent Events Inventory, Raw Materials, Net of Reserves Raw materials Related Party Transactions Disclosure [Text Block] Related Party Transactions APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition, Total Equity, Attributable to Parent Equity, Attributable to Parent, Ending Balance Equity, Attributable to Parent, Beginning Balance Total shareholders' equity Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Statement of Stockholders' Equity [Abstract] Tabular disclosure of the components of cash and cash equivalents by location. Schedule Of Cash Cash Equivalents By Location Table [Text Block] Schedule of cash and cash equivalents by location Equity Method Investments Equity method investments, net Use of Estimates, Policy [Policy Text Block] Use of Estimates Share-Based Payment Arrangement, Forfeiture Method [Fixed List] Share-based Compensation, Forfeiture Method [Fixed List] Leasehold Improvements [Member] Leasehold improvements Gain (Loss), Foreign Currency Transaction, before Tax Foreign Currency Transaction Gain (Loss), before Tax, Total Foreign currency transaction (loss) gain, net Entity Address, Address Line Two Entity Address, Address Line Two Taiwan, New Dollars New Taiwan Dollars UNITED STATES United States Noncontrolling Interest [Member] Non-Controlling Interests Represents the percentage of estimated future forfeiture rate for stock-based awards. Share Based Compensation Arrangement By Share Based Payment Award Estimated Forfeiture Rate Estimated forfeiture rate (as a percent) Entity Incorporation, Date of Incorporation Date of entity incorporation Schedule of accrued expenses and other current liabilities Schedule of Accrued Liabilities [Table Text Block] Debt Instrument, Name [Domain] Debt Instrument, Name Noncash Investing and Financing Items [Abstract] NONCASH INVESTING AND FINANCING ACTIVITIES: Income (Loss) from Equity Method Investments Investment income (loss) from unconsolidated entities Investment loss from unconsolidated entities Entity [Domain] Entity Equity method investment, Percentage Ownership Equity Method Investment, Ownership Percentage Schedule of Investments [Line Items] Investments in unconsolidated entities Debt Instrument, Repaid, Principal Repayment of loan principal Related and Nonrelated Parties [Axis] Related Party Accounting Standards Update [Extensible Enumeration] Entity Address, City or Town Entity Address, City or Town Cash, FDIC Insured Amount Cash, FDIC insured amount Security Exchange Name Security Exchange Name Property, Plant and Equipment, Gross Total property, plant and equipment Property, Plant and Equipment, Gross, Total Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Ending Balance Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (loss) before income taxes (Loss) income before income taxes Concentration Risk Type [Domain] Concentration Risk Type Antidilutive Securities, Name [Domain] Antidilutive Securities, Name Debt Instrument, Increase, Accrued Interest Inventory, Net Total Inventories, net Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation CASH AND CASH EQUIVALENTS AND RESTRICTED CASH—End of period CASH AND CASH EQUIVALENTS AND RESTRICTED CASH—Beginning of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total Interest Paid, Excluding Capitalized Interest, Operating Activity Cash paid for interest Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Statistical Measurement [Domain] Statistical Measurement Assets, Current Total current assets Document Period End Date Document Period End Date Title and Position [Axis] Title of Individual Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Foreign currency translation adjustments, net of tax of $0 for all periods presented Other comprehensive income (loss) Gain (Loss) on Disposition of Property Plant Equipment Gain on disposals of long-lived assets, net Gain (Loss) on Disposition of Property Plant Equipment, Total Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Weighted Average Amortization Period (Years) Statement of Financial Position [Abstract] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) Interest rate on promissory notes payable Interest rate on promissory notes payable. Interest Rate On Promissory Notes Payable Revenue Recognition Revenue [Policy Text Block] Tax Cuts And Jobs Act Of2017 One Time Transition Tax Payable Period On Unrepatriated Earnings Of Foreign Subsidiaries Tax cuts and jobs act of 2017, one-time transition tax payable period on unrepatriated earnings of foreign subsidiaries. One-time transition tax payable period on certain unrepatriated earnings from non-U.S. subsidiaries Antidilutive Security, Excluded EPS Calculation [Table] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Amendment of the 2010 Plan to extend the term Two Thousand Ten Plan Term Extension Two thousand ten plan term extension. Customer Deposits Current Liabilities Customer Deposits Current Liabilities Customer deposits Liabilities Total liabilities Majority Shareholder [Member] J.R. Simplot Company Tabular disclosure of the components of property, plant and equipment. Schedule Of Property Plant And Equipment Components Table [Text Block] Schedule of property, plant and equipment All Currencies [Domain] All Currencies Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Comprehensive income (loss): Schedule of balance sheet information related to Leases. Schedule Of Balance Sheet Information Related To Leases Table [Text Block] Schedule of balance sheet information related to leases Lessee, Operating Lease, Liability, to be Paid, Year Two 2028 Stock issued during period, value, to repay loan. Stock Issued During Period, Value, To Repay Loan Issuance of common stock to repay long-term loan Finite-Lived Intangible Assets, Gross Gross Carrying Amount Finite-Lived Intangible Assets, Gross, Total Represents the number of share-based compensation plans approved by the board of directors and stockholders of the entity. Share Based Compensation Arrangement By Share Based Payment Award Number Of Plans Number of share-based compensation plans Weighted Average Number of Shares Outstanding, Diluted Diluted Weighted Average Number of Shares Outstanding, Diluted, Total Entity File Number Entity File Number Conversion of convertible notes principal and interest shares issued. Conversion of Convertible Notes Principal and Interest Shares Issued Shares issued on conversion of convertible notes principal and interest Cover [Abstract] Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Revenue Benchmark [Member] Net Revenues Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Shares of common stock reserved for issuance Payments for Placement of Refundable Deposits Payments for placement of refundable deposits. Placement of refundable deposits Noncontrolling Interest [Line Items] Minority Interest [Line Items] Tabular disclosure about the operations of the business organization. Business Organization [Table] Business Organization [Table] Total Finite-Lived Intangible Assets, Net Intangible assets, net Finite-Lived Intangible Assets, Net, Beginning Balance Finite-Lived Intangible Assets, Net, Ending Balance Debt Instrument, Convertible, Conversion Price Debt instrument, convertible conversion price Operating Lease, Expense Operating lease expenses, net Few Select Markets, Including The United States, Japan, Taiwan and Netherlands [Member] Few Select Markets, Including The United States, Japan, Taiwan and Netherlands. Few Select Markets, including the United States, Japan, Taiwan and Netherlands Schedule of Investments [Table] Schedule Of Investments [Table] New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Schedule of aggregate future noncancelable minimum rental payments for the operating leases Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Impairment loss on investment Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Stock Issued During Period, Shares, Conversion of Convertible Securities Stock issued during period, upon conversion of unsecured convertible promissory notes, shares Conversion of convertible notes payable to common stock (in shares) Ownership [Axis] Ownership Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Vesting period Income (Loss) from Continuing Operations before Income Taxes, Domestic U.S. operations Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding Common stock, shares outstanding Common Stock, Shares, Outstanding, Ending Balance Operating Lease, Liability, Current Operating lease liabilities, current Operating lease liabilities, current portion Depreciation, Depletion and Amortization Depreciation and amortization Depreciation, Depletion and Amortization, Total Document Transition Report Document Transition Report Operating Expenses Total operating expenses Research and Development Expense Research and development Research and Development Expense, Total Cost of Revenue Cost of revenues Cost of Revenue, Total Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive (loss) income Statement of Cash Flows [Abstract] Stock Issued During Period, Value, New Issues Common stock issued during period, value Finite-Lived Intangible Assets [Line Items] Finite Lived Intangible Assets [Line Items] Earnings Per Share [Text Block] Net Loss Per Share of Common Stock Revenue Recognition [Abstract] Revenues Recognition Net income (loss) attributable to SemiLEDs stockholders Inventory Write-down Provisions for inventory write-downs Inventory write-downs Increase (Decrease) in Inventories Inventories Increase (Decrease) in Inventories, Total Operating Lease, Cost Lease expense related to noncancelable operating leases Purchase Obligation Purchase commitments for inventory, property, plant and equipment Purchase Obligation, Total Operating Lease, Payments Operating cash flows from operating leases Assets [Abstract] ASSETS Construction in Progress [Member] Construction in progress Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Document Fiscal Year Focus Document Fiscal Year Focus Debt Conversion, Converted Instrument, Shares Issued Shares delivered for repayment of loan principal Concentration Risk Benchmark [Domain] Concentration Risk Benchmark Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES: Accounts Payable, Current Accounts payable Accounts Payable, Current, Total Cancellable and noncancellable operating lease expiration. Cancellable And Noncancellable Operating Lease Expiration Cancellable and noncancellable operating lease expiration Cancellable and noncancellable operating lease expiration Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Schedule of income (loss) before income taxes Unconsolidated entities. Unconsolidated Entities [Member] Unconsolidated Entities Research and Development Expense [Member] Research and development Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Change ownership in SBDI Change ownership in SBDI Debt Conversion, Converted Instrument, Amount Amount of unsecured convertible promissory notes converted Unsecured convertible promissory notes principal amount. Unsecured Convertible Promissory Notes Principal Amount Principal amount of unsecured convertible promissory notes Other Liabilities, Total Other Liabilities Related party loan repayment amount Commitments and Contingencies Disclosure [Abstract] Lessee, Operating Lease, Liability, to be Paid, Year One 2027 Purchase Obligations Purchase Obligation [Abstract] Purchase Obligations Debt Instrument [Axis] Debt Instrument Share-Based Payment Arrangement [Abstract] Accounts Payable, Related Party [Extensible Enumeration] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Business Organization [Line Items] Business Concentration Risk, Percentage Concentration risk (as a percent) Revenues Revenues, net Revenues, Total Intellectual Property [Member] Patents and trademarks Debt Instrument Unpaid Interest Debt instrument unpaid interest. Debt instrument unpaid interest Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Net cash used in investing activities Title of 12(b) Security Title of 12(b) Security Entity Address, Address Line Three Entity Address, Address Line Three Related and Nonrelated Parties [Domain] Related Party Income Tax Disclosure [Text Block] Income Taxes Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Remainder of 2026 Legal Entity [Axis] Legal Entity Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Changes in : Income Tax Disclosure [Abstract] Accrued Liabilities and Other Liabilities [Abstract] Unrecognized Tax Benefits Unrecognized tax benefits Unrecognized Tax Benefits, Beginning Balance Unrecognized Tax Benefits, Ending Balance Additional Paid-in Capital [Member] Additional Paid-in Capital Represents the minimum period of the standard product warranty liability. Standard Product Warranty Period Minimum Minimum warranty period Statement of Income Location, Balance [Axis] Income Statement Location Trading Symbol Trading Symbol Intangible Asset, Finite-Lived [Table] Schedule Of Finite Lived Intangible Assets [Table] Tax year remain open Open Tax Year Related Party Transaction [Table] Schedule Of Related Party Transactions By Related Party [Table] Stock issued during period, shares, to repay loan. Stock Issued During Period, Shares, To Repay Loan Issuance of common stock to repay long-term loan (in shares) Director [Member] Directors Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of intangible assets Accrued compensation and benefits Employee-related Liabilities, Current Employee-related Liabilities, Current, Total Buy-Sell Purchase Orders of Equipment [Member] Buy-sell purchase orders of equipment. Buy-Sell Purchase Orders of Equipment TAIWAN Taiwan Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES: Lessee, Operating Lease, Liability, to be Paid Total future minimum lease payments, undiscounted Lessee, Operating Lease, Liability, Undiscounted Excess Amount Less: Imputed interest Equity Components [Axis] Equity Components Other payable to related parties Accounts Payable, Total Accounts Payable Nonoperating Income (Expense) Total other income, net Equity Component [Domain] Equity Component Top ten customers. Top Ten Customers [Member] Top Ten Customers Machinery and equipment Machinery and Equipment [Member] Customer [Axis] Customer Building and Building Improvements [Member] Buildings and improvements Statement of Comprehensive Income [Abstract] Maximum [Member] Maximum Statistical Measurement [Axis] Statistical Measurement Time Deposits, At or Above Central Deposit Insurance Corporation (C D I C) Insurance Limit Time deposits, at or above Central Deposit Insurance Corporation (CDIC) insurance limit. Cash in excess of CDIC insured amount Finite-Lived Intangible Assets, Accumulated Amortization Accumulated Amortization Common Stock, Value, Issued Common stock value Common stock, $0.0000056 par value - 15,000 shares authorized; 8,258 shares issued and outstanding as of February 28, 2026 and August 31, 2025 Other Currency [Member] Other Currencies Consolidation, Policy [Policy Text Block] Principles of Consolidation Equity, Including Portion Attributable to Noncontrolling Interest BALANCE BALANCE Total shareholders' equity Time Deposits, at or Above FDIC Insurance Limit Cash in excess of FDIC insured limits Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest, Total Comprehensive (loss) income attributable to noncontrolling interests Stock-based compensation (in shares) Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Shares Value Adjustments to additional paid in capital sharebased compensation requisite service period recognition shares value. Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class Related Party Transaction [Line Items] Related Party Transaction [Line Items] Entity Registrant Name Entity Registrant Name Customer Concentration Risk [Member] Customer Concentration Other Nonoperating Income (Expense) Other income, net Other Nonoperating Income (Expense), Total Subsequent Events [Abstract] Income Tax Expense (Benefit) Income tax expense Income Tax Expense (Benefit), Total Chairman and Chief Executive Officer and Largest Shareholder. Chairman And Chief Executive Officer And Largest Shareholder [Member] Holders Subsidiary, Ownership Percentage, Noncontrolling Owner Noncontrolling interest (as percentage) Rule 10b5-1 Arr Modified Flag Rule 10b5-1 Arr Modified Flag. Rule 10b5-1 Arrangement Modified Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration of Credit Risk Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Payments to Acquire Property, Plant, and Equipment Purchases of property, plant and equipment Payments to Acquire Property, Plant, and Equipment, Total Gain (Loss) on Investments, Total Gain (Loss) on Investments Investment loss from unconsolidated entities Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Stock units granted (in shares) Assets TOTAL ASSETS Property, Plant and Equipment [Table] Schedule Of Property Plant And Equipment [Table] High Power Optoelectronics inc [Member] High Power Optoelectronics inc. High Power Optoelectronics, inc. Disclosure of accounting policy for concentration of supply risk. Concentration Of Supply Risk Policy [Text Block] Concentration of Supply Risk Income Statement [Abstract] Selling, General and Administrative Expenses [Member] Selling, general and administrative Stock Issued During Period, Shares, New Issues Common stock issued during period, shares Earnings Per Share, Diluted Diluted Earnings Per Share, Diluted, Total Title and Position [Domain] Title of Individual City Area Code City Area Code Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date Plan expiration date Debt Instrument, Face Amount Aggregate amount of loan Operating Lease, Weighted Average Remaining Lease Term Operating leases Proceeds from Equity Method Investment, Distribution Dividend received from unconsolidated entities Property, Plant and Equipment, Net Property, plant and equipment, net Property, plant and equipment, net Operating Income (Loss) Income (loss) from operations Loss from operations Losses from operations Losses from operations (Loss) income from operations Retained Earnings [Member] Accumulated Deficit Entity Address, Country Entity Address, Country Share-Based Payment Arrangement, Noncash Expense Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense, Total Disclosure Text Block Supplement [Abstract] Operating Lease, Weighted Average Discount Rate, Percent Operating leases Operating Lease, Liability, Noncurrent Operating lease liabilities, less current portion Operating lease liabilities, less current portion Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash used in financing activities Lease, Cost [Table Text Block] Schedule of lease expenses and related cash flows Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Developed Technology Rights [Member] Acquired technology Nonoperating Income (Expense) [Abstract] Other income (expenses): Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of stock-based compensation plan awards were excluded from the computation of diluted net loss per share of common stock Entity Interactive Data Current Entity Interactive Data Current Statement of Income Location, Balance [Domain] Income Statement Location Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: A tabular presentation of the information summarizing investments in unconsolidated entities. Schedule Of Investments In Unconsolidated Entities Table [Text Block] Schedule of ownership interest and carrying amounts of investments in unconsolidated entities Entity Tax Identification Number Entity Tax Identification Number Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Effect of exchange rate changes on cash and cash equivalents and restricted cash Local Phone Number Local Phone Number Related Party Transaction [Domain] Investments in Unconsolidated Entities Investments In Unconsolidated Entities Disclosure [Abstract] Weighted Average Number of Shares Outstanding, Diluted [Abstract] Shares used in computing net (loss) income per share attributable to SemiLEDs stockholders: Accounting Policies [Abstract] Yi Yang Optoelectronics Co., Ltd Yi Yang Optoelectronics Co., Ltd. Yi Yang Optoelectronics Co., Ltd [Member] Other (individually less than 5% of total accrued expenses and other current liabilities) Other Sundry Liabilities, Current Lessee, Operating Lease, Liability, to be Paid, Year Four 2030 Accrued Professional Fees, Current Accrued professional service fees Entity Emerging Growth Company Entity Emerging Growth Company