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Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Increase/(Decrease) Increase (Decrease) in Contract with Customer, Asset STOCKHOLDERS' EQUITY Equity [Text Block] Security Exchange Name Security Exchange Name Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Class B Common Stock Common Class B Common Class B [Member] Consolidation Items [Domain] Consolidation Items [Domain] Amortized Cost, Due within years two through five years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Schedule of Property and Equipment Property, Plant, and Equipment [Table Text Block] Statement of Comprehensive Income [Abstract] EARNINGS PER COMMON SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Attributable to Houlihan Lokey, Inc. common stockholders: Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Amortized Cost , due within one year Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Total liabilities Liabilities Trading Symbol Trading Symbol Non-compensation expense by segment Non-Compensation Expense Non-Compensation Expense Geographical [Domain] Geographical [Domain] Capital expenditures Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Company Selected Measure Name Company Selected Measure Name Schedule of Restricted Cash Restrictions on Cash and Cash Equivalents [Table Text Block] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] 2016 Incentive Plan Incentive Plan 2016 [Member] Incentive Plan 2016 [Member] Estimated Fair Value, due within one year Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Net income per share attributable to holders of shares of common stock Earnings Per Share, Diluted [Abstract] Estimated Fair Value, Due within years two through five Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Credit Facility [Domain] Credit Facility [Domain] Depreciation and 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activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Revenues Revenue from Contract with Customer, Excluding Assessed Tax Property and equipment, net Total net book value Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Certain Employees Company Employees [Member] Company Employees [Member] Financial Instruments [Domain] Financial Instruments [Domain] Tradename-Houlihan Lokey Indefinite-Lived Trade Names Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] GOODWILL AND OTHER INTANGIBLE ASSETS Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Comprehensive (income) loss attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] Gross Unrealized Gains Debt Securities, Trading, 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Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Computers and software Computers And Software [Member] Computers And Software [Member] Information technology and communications Communications and Information Technology Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Common stock, dividends, per share, declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Increase/(Decrease) Increase (Decrease) in Contract with Customer, Receivables, Net Increase (Decrease) in Contract with Customer, Receivables, Net Schedule of Maturities of Debt Securities Investments Classified by Contractual Maturity Date [Table Text Block] Other shares repurchased/forfeited (in 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Liabilities and Equity [Abstract] Award Type [Domain] Award Type [Domain] Leverage ratio Debt Instrument, Covenant, Leverage Ratio, Maximum Debt Instrument, Covenant, Leverage Ratio, Maximum Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Level III Fair Value, Inputs, Level 3 [Member] Cash paid during the period for: Supplemental Cash Flow Information [Abstract] 2028 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities PEO Name PEO Name Geographical [Axis] Geographical [Axis] Leasehold improvements Leasehold Improvements [Member] Share repurchases Payments for Repurchase of Equity Beginning balance Ending balance Contract with Customer, Liability Property, Plant and Equipment, Type [Axis] Long-Lived Asset, Class [Axis] Other assets Other Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Allowance for Uncollectible Accounts Receivable Accounts Receivable, Allowance for Credit Loss [Roll Forward] Cash, cash equivalents, and restricted cash – beginning of period Cash, cash equivalents, and restricted cash – end of period Total cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Corporate Finance Corporate Finance [Member] Corporate Finance [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] BACKGROUND Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] 2029 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Employee compensation and benefits Labor and Related Expense Conversion of Class B to Class A shares (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Basic (in dollars per share) Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Insider Trading Arrangements [Line Items] Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Revaluation of acquisition contingent consideration Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease) Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common stock Common Stock [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] International Non-US [Member] Intangible Asset, Finite-Lived, after Accumulated Amortization, Estimated Amortization Expense, Fiscal Year Maturity [Abstract] Intangible Asset, Finite-Lived, after Accumulated Amortization, Estimated Amortization Expense, Fiscal Year Maturity [Abstract] Derivative Contract [Domain] Derivative Contract [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Total liabilities, temporary equity and stockholders' equity Liabilities and Equity Goodwill and Other intangible assets, net Intangible Asset, Including Goodwill, after Accumulated Amortization Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Related Party [Domain] Related and Nonrelated Parties [Domain] Allowance for Uncollectible Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Fair Value Debt Securities, Trading Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital 2030 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Remainder of 2027 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Name Awards Close in Time to MNPI Disclosures, Individual Name Purchases of investment securities Payments to Acquire Investments Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Forfeited/Repurchased (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Property, Plant and Equipment, Type [Domain] Long-Lived Asset, Class [Domain] Christopher Crain [Member] Christopher Crain Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Adjustment to Compensation: Adjustment to Compensation [Axis] Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Foreign Exchange Forward, US Dollar and Euro Foreign Exchange Forward, US Dollar and Euro [Member] Foreign Exchange Forward, US Dollar and Euro Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name INCOME TAXES Income Tax Disclosure [Text Block] Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Equipment Equipment [Member] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Contract Liabilities Changes in Contract with Customer, Liability [Roll Forward] Changes in Contract with Customer, Liability [Roll Forward] Rent Operating Lease, Expense Company Selected Measure Amount Company Selected Measure Amount Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Entity Address, Address Line Two Entity Address, Address Line Two Stock, Class of Stock [Table] Stock, Class of Stock [Table] Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Financial Advisory Services Financial Advisory Services [Member] Financial Advisory Services [Member] Non-PEO NEO Non-PEO NEO [Member] Foreign Currency Transactions Foreign Currency Transactions and Translations Policy [Policy Text Block] Entity Address, Address Line One Entity Address, Address Line One Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Provision for income taxes Provision for income taxes Income Tax Expense (Benefit) Award Timing Method Award Timing Method [Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Net decrease in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Other intangible assets, net Other Intangible Assets, Net Net income attributable to Houlihan Lokey, Inc. Net income Net income attributable to Houlihan Lokey, Inc. Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Revaluation of acquisition contingent consideration Business Combination. Revaluation of Contingent Consideration Business Combination. Revaluation of Contingent Consideration Statement [Table] Statement [Table] Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Restatement Determination Date: Restatement Determination Date [Axis] Financial Restructuring Financial Restructuring [Member] Financial Restructuring [Member] Contract with Customer, Asset and Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Fed Funds Effective Rate Overnight Index Swap Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Contract Assets Changes in Contract with Customer, Asset [Roll Forward] Changes in Contract with Customer, Asset [Roll Forward] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]