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Related Party Transaction [Table] Related Party Transaction [Table] Schedule of Investments with readily determinable fair values [Table] Equity Method Investment [Table] Stock Options Additional Disclosures Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Schedule of Supplemental Income Statement Information Lease, Cost [Table Text Block] Other current assets Total Other Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating loss Operating Income (Loss) Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date Xtract One warrants Warrants and Rights Outstanding Revenue Recognition [Abstract] Revenue Recognition [Abstract] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Credit spread adjustment (as a percent) Debt Instrument, Credit Spread Adjustment (SOFR) Debt Instrument, Credit Spread Adjustment (SOFR) Related Party Transaction [Domain] Related Party Transaction [Domain] Restructuring Liability Restructuring Reserve [Roll Forward] 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] Dividends declared (in USD 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] Debt instrument collateral Debt Instrument, Collateral Equity investments Equity Securities [Member] Schedule of Stock Options Award Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Weighted-Average Exercise Price Per Share Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Impairment losses Asset, Impairment Loss Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Balance at beginning of period Balance at end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Description of Business and Basis of Presentation Business Description and Basis of Presentation [Text Block] Treasury stock, at cost (in shares) Treasury Stock, Common, Shares Knicks Revolving Credit Facility Knicks Revolving Credit Facility [Member] Knicks Revolving Credit Facility Effective interest rate Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Related Party Related Party [Member] Income taxes paid, net Income Tax Paid, after Refund Received Deferred compensation arrangement with individual, compensation expense Deferred Compensation Arrangement with Individual, Compensation Expense Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Class A Common Stock Common Class A [Member] Operating lease expense associated with the Arena License Agreements Related Party Transaction, Operating Lease Expense Associated With Arena License Agreements Related Party Transaction, Operating Lease Expense Associated with Arena License Agreements Entity Interactive Data Current Entity Interactive Data Current Variable Rate [Axis] Variable Rate [Axis] Common stock issued under stock incentive plans Stock Issued During Period, Value, Restricted Stock Unit Award Aggregate value of stock related to Restricted Stock Units issued during the period. Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Other comprehensive income Other comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Fiscal year ending June 30, 2030 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Shares withheld for tax withholding obligation, value (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table] Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table] Accounts payable Increase (Decrease) in Accounts Payable, Trade Fair Value, Assets and Liabilities Measured on Recurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Federal statutory income tax rate (as percent) Effective Income Tax Rate Reconciliation, at Federal 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Exercisable, aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Stock repurchase program, remaining authorized amount Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Schedule of Prepaid Expenses Schedule Of Prepaid Expenses [Table Text Block] Schedule Of Prepaid Expenses Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Deferred revenue, noncurrent Contract with Customer, Liability, Noncurrent Additional Financial Information Additional Financial Information Disclosure [Text Block] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Other comprehensive income, before income taxes Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Warrants and rights outstanding term (in years) Warrants and Rights Outstanding, Term Commitments and contingencies (see Note 12) Commitments and Contingencies MSG Stockholders MSG Stockholders [Member] M S G Stockholders Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Warrants and rights outstanding, measurement input (as a percent) Warrants and Rights Outstanding, Measurement Input Income (losses) from equity method investments Income (Loss) from Equity Method Investments Other Current Assets Other Assets [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Counterparty Name [Axis] Counterparty Name [Axis] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Exercisable, weighted-average remaining contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted-Average Remaining Contractual Term Amounts reclassified from accumulated other comprehensive loss: Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax [Abstract] Inventory Inventory, Net Award Type [Domain] Award Type [Domain] Impairment charges and observable price changes Equity Securities Without Readily Determinable Fair Value, Impairments And Observable Price Changes Equity Securities Without Readily Determinable Fair Value, Impairments And Observable Price Changes Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fiscal year ending June 30, 2027 (remainder) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Fair Value Measurements Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Transaction Type [Axis] Transaction Type [Axis] Repurchases of common stock (in shares) Treasury Stock, Shares, Acquired Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] PEO Name PEO Name Deferred revenue, including non-current portion Contract with Customer, Liability Prepaid Expenses Prepaid Expense, Current [Abstract] Schedule of Short-term Debt [Table] Short-Term Debt [Table] Other segment items Segment Reporting, Other Segment Item, Amount Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Payments Payments for Restructuring Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash on the consolidated statements of cash flows Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Common stock issued under stock incentive plans Stock Issued During Period, Value, Treasury Stock Reissued Rent expense pursuant to Sublease Agreement Related Party Transaction, Rent Expense Related Party Transaction, Rent Expense Other accrued liabilities Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Base Rate Base Rate [Member] Debt service ratio, terms, number of trailing quarters Debt Instrument, Debt Service Ratio, Terms, Number Of Trailing Quarters Debt Instrument, Debt Service Ratio, Terms, Number Of Trailing Quarters 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] Restricted cash Restricted Cash and Cash Equivalent, Current 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] Debt Instrument [Axis] Debt Instrument [Axis] Ownership (as a percent) Equity Method Investment, Ownership Percentage Spinoff Spinoff [Member] Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Total lease cost Lease, Cost Investment, Name [Domain] Investment, Name [Domain] Number of shares received for every one common stock shares held on record date (in shares) Number Of Shares Received For Every One Common Stock Shares Held On Record Date Number Of Shares Received For Every One Common Stock Shares Held On Record Date Leases Lessee, Operating Leases [Text Block] Basic loss per common share attributable to MSG Knickerbockers Corp.’s stockholders (in USD per share) Basic loss per common share attributable to MSG Knickerbockers Corp.’s stockholders (in USD per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Short-term debt, terms Short-Term Debt, Terms Deferred revenue Contract with Customer, Liability, Current Risk-free interest rate Measurement Input, Risk Free Interest Rate [Member] Schedule of Deferred Financing Costs Schedule Of Deferred Financing Costs [Table Text Block] Schedule Of Deferred Financing Costs Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Debt, current Short-Term Debt, Fair Value Long-term debt Long-Term Debt, Excluding Current Maturities Receivables Arising From Contracts With Customers Receivables Arising From Contracts With Customers [Member] Receivables Arising From Contracts With Customers Time deposits Bank Time Deposits [Member] Award Type [Axis] Award Type [Axis] Corporate & administrative Corporate And Administrative Expense Corporate And Administrative Expense Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Accumulated deficit Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Penny warrants issued, exercisable, percentage of equity interests (as a percent) Penny Warrants Issued Exercisable Percentage Of Equity Interests Penny Warrants Issued Exercisable Percentage Of Equity Interests Product and Service [Axis] Product and Service [Axis] Equity investments with readily determinable fair values: Carrying Value/Fair Value Equity Securities, FV-NI Number of options to purchase per holder on record date (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Options To Purchase Per Holder On Record Date Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Options To Purchase Per Holder On Record Date 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] Non-Employee Director Plan Non-Employee Director Plan [Member] Non-Employee Director Plan Short-Term Debt [Line Items] Short-Term Debt [Line Items] Common Stock Issued Common Stock [Member] Media rights Media Rights [Member] Media Rights (including local and league-wide national and international) [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Team Personnel Transactions Team Personnel Transactions And Insurance Recoveries [Text Block] Team Personnel Transactions And Insurance Recoveries [Text Block] Operating lease costs Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Local Media Rights Local Media Rights [Member] Local Media Rights Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] MSG Rangers MSG Rangers [Member] MSG Rangers Revenue, Remaining Performance Obligation Revenue, Remaining Performance Obligation, Provision for Loss [Policy Text Block] Equity Awards Adjustments Equity Awards Adjustments [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Total liabilities and equity Liabilities and Equity Warrants assigned, exercisable, percentage of equity interests (as a percent) Percentage Of Equity Interests Received In Exchange For Warrants Exercisable Percentage Of Equity Interests Received In Exchange For Warrants Exercisable Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Plan Name [Axis] Plan Name [Axis] Restructuring charges Restructuring charges Restructuring charges Restructuring Charges Related Party [Domain] Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Miscellaneous (expense) income, net Other Nonoperating Income (Expense) Name Awards Close in Time to MNPI Disclosures, Individual Name Purchases of investments 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] Schedule of Cost Basis and Carrying Value of Equity Investments with Readily Determinable Fair Values and Realized and Unrealized Gains (Losses) on Equity Investments with Readily Determinable Fair Values Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Forfeited / Cancelled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period MSG Networks MSG Networks [Member] MSG Networks [Member] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Maximum capacity Short-Term Debt, Maximum Capacity Maximum capacity that could be advanced. Preferred stock, par value $0.01, 15,000 shares authorized; none outstanding as of September 30, 2026 and June 30, 2026 Preferred Stock, Value, Issued 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] Credit Facility [Axis] Credit Facility [Axis] Restructuring Charges Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets measured at fair value Assets, Fair Value Disclosure Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Entity Information, Former Legal or Registered Name Entity Information, Former Legal or Registered Name Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Thereafter Lessee, Operating Lease, Liability, To Be Paid, After Year Four Lessee, Operating Lease, Liability, To Be Paid, After Year Four Indefinite-lived Intangible Assets [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Prepaid employee-related costs Prepaid Employee Related Costs, Current Prepaid Employee Related Costs, Current Goodwill impairment Goodwill, Impairment Loss Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Expected term Measurement Input, Expected Term [Member] Operating lease expenses and other rental expenses associated with the Arena License Agreements Operating Lease, Expense Company Selected Measure Amount Company Selected Measure Amount Unrealized (loss) gain Equity Securities, FV-NI, Unrealized Gain (Loss) Investments, Debt and Equity Securities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Net loss allocable to common shares, basic and diluted (numerator): Numerator [Abstract] Numerator Cash, Cash Equivalents and Restricted Cash Cash and Cash Equivalents Disclosure [Text Block] Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Contract Assets Arising From Contract With Customers Contract Assets Arising From Contract With Customers [Member] Contract Assets Arising From Contract With Customers Current Assets: Assets, Current [Abstract] Operating lease, weighted average remaining term (in years) Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Amortization of actuarial loss included in net periodic benefit cost Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Entity Address, Address Line One Entity Address, Address Line One Non-cash additions to ROU and lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Vested (in USD 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 Line of credit facility amount outstanding Line of Credit Facility, Fair Value of Amount Outstanding Income tax benefit Income tax benefit Income Tax Expense (Benefit) Marketing & event-related expenses Marketing And Event-Related Expenses Marketing And Event-Related Expenses Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] 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] Net loss Net loss Net loss Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Location, Statement of Financial Position, Balance [Axis] Location, Statement of Financial Position, Balance [Axis] Knicks Knicks [Member] New York Knicks, LLC[Member] Statement [Table] Statement [Table] Restrictive covenants Debt Instrument, Restrictive Covenants Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Estimated Revenue Expected to be Recognized in the Future Related to Performance Obligations Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Interest income Interest income Investment Income, Interest Exercisable (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Event-related Event-Related [Member] Event-Related [Member] Schedule of Contract Balances Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] 2017 Rangers Revolving Credit Facility 2017 Rangers Revolving Credit Facility [Member] 2017 Rangers Revolving Credit Facility Restricted Stock Units (RSUs) and Performance Stock Units (PSUs) Restricted Stock Units (RSUs) And Performance Stock Units (PSUs) [Member] Restricted Stock Units (RSUs) And Performance Stock Units (PSUs) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]