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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
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Apr. 21, 2023 USD ($) | Feb. 14, 2023 USD ($) | Nov. 01, 2022 | Nov. 30, 2016 USD ($) | Oct. 31, 2022 segment item | Jul. 31, 2021 USD ($) | Feb. 28, 2021 USD ($) | Mar. 31, 2023 USD ($) segment | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Mar. 08, 2023 | Sep. 30, 2022 USD ($) | Jul. 29, 2021 USD ($) | Jan. 25, 2021 USD ($) | Apr. 10, 2015 USD ($)
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  | $ 476,000 | $ 26,473,000 | $ 26,473,000 | $ 26,475,000 |  | $ 26,474,000 |  |  |
Number of Reportable Segments | segment |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |
Allowance for doubtful accounts receivable (in dollars) |  |  |  |  |  |  |  | $ 7,188,000 |  |  | 9,223,000 |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  | 109,869,000 |  | 112,131,000 |  |  |  |  |  |
Reassessed Estimated Fair Value of Award |  |  |  |  |  |  |  | 25,600,000 |  |  | 25,700,000 |  |  |  |  |
Selling, General and Administrative Expense, Total |  |  |  |  |  |  |  | 36,874,000 |  | 35,210,000 | 160,642,000 |  |  |  |  |
Exercisable period of put rights |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest |  |  |  |  |  |  |  | 25,116,000 | 27,059,000 | 26,852,000 | 31,923,000 |  | $ 28,952,000 |  |  |
Investment in unconsolidated joint venture |  |  |  |  |  |  |  | 13,125,000 |  |  |  |  |  |  |  |
Operating Lease, Liability |  |  |  |  |  |  |  | 30,460,000 |  |  |  |  |  |  |  |
Impairment of goodwill, intangible assets, and long-lived assets |  |  |  |  |  |  |  | 16,775,000 |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  |  |  | 800,000 |  | 900,000 |  |  |  |  |  |
Due to Other Related Parties, Current |  |  |  |  |  |  |  | 1,400,000 |  |  | 1,500,000 |  |  |  |  |
Number of reporting units | item |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |  |
Number of radio markets | item |  |  |  |  | 13 |  |  |  |  |  |  |  |  |  |  |
Number of other business segments | segment |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |
Non-cash launch additions |  |  |  |  |  |  |  | 0 |  | 18,750,000 |  |  |  |  |  |
RVAEH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial investment in escrow account |  |  |  |  |  | $ 26,000,000.0 |  |  |  |  |  |  |  |  |  |
Decrease in restricted cash due to derecognition |  |  |  |  |  |  | $ 26,000,000.0 |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  | 0 |  |  | 26,000,000.0 |  |  |  |  |
Percentage of ownership of equity interest excluding interest in entity |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold period to get the option to purchase all of their shares after reaching certain milestone |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest |  |  |  |  |  |  |  |  |  |  | 6,600,000 |  |  |  |  |
Percentage of ownership interest held |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss in other expense (income) |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated joint venture |  |  |  |  |  |  |  | 13,100,000 |  |  |  |  |  |  |  |
Churchhill Downs Incorporated | RVAEH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership of equity interest excluding interest in entity |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest purchased |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest held |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment purchased |  | $ 6,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Host Community Agreement [Member] | RVA Entertainment Holdings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront payment (refund) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,000,000 |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts receivable (in dollars) |  |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |  |
Event revenues & other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  | 1,782,000 |  | 824,000 |  |  |  |  |  |
Reserve for audience deficiency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |
Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketing and Advertising Expense |  |  |  |  |  |  |  | 7,100,000 |  | 7,400,000 |  |  |  |  |  |
Barter Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  | 600,000 |  | 400,000 |  |  |  |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  | 400,000 |  | 300,000 |  |  |  |  |  |
Selling, General and Administrative Expense, Total |  |  |  |  |  |  |  | 200,000 |  | 200,000 |  |  |  |  |  |
Radio broadcasting and Reach Media segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Commissions and Fees |  |  |  |  |  |  |  | 4,200,000 |  | 3,700,000 |  |  |  |  |  |
Fantastic Voyage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income Guarantee |  |  |  |  |  |  |  | $ 1,750,000 |  |  |  |  |  |  |  |
Launch support asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite Lived Intangible Assets Weighted Average Amortization Period |  |  |  |  |  |  |  | 8 years 1 month 6 days |  |  | 8 years 1 month 6 days |  |  |  |  |
Finite Lived Intangible Assets Remaining Weighted Average Amortization Period |  |  |  |  |  |  |  | 3 years 7 months 6 days |  |  | 3 years 9 months 18 days |  |  |  |  |
Payment for launch support |  |  |  |  |  |  |  | $ 0 |  | 0 |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  |  |  |  | $ 1,200,000 |  | 700,000 |  |  |  |  |  |
Licensing Agreements [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Licensing Agreements [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Radio Broadcasting Licenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge, indefinite lived intangible asset |  |  |  |  |  |  |  | $ 16,775,000 |  |  |  |  |  |  |  |
Tom Joyner Foundation Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement Expenditure Guarantee |  |  |  |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |
Percentage of Performance Bonus |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Tom Joyner Foundation Inc [Member] | Fantastic Voyage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income Guarantee |  |  |  |  |  |  |  | $ 250,000 |  |  |  |  |  |  |  |
Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Award Amount |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |
7.375% Senior Secured Notes due February 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | $ 725,000,000.0 |  |  | $ 750,000,000.0 |  |  |  |  |
Fair value of debt |  |  |  |  |  |  |  | $ 645,300,000 |  |  | 646,900,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 7.375% |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 825,000,000.0 |
PPP loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Income |  |  |  |  |  |  |  |  | $ 7,600,000 |  |  |  |  |  |  |
Tv One Llc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Commissions and Fees |  |  |  |  |  |  |  | $ 5,000,000.0 |  | 5,100,000 |  |  |  |  |  |
Customer Advances [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  | 1,900,000 |  |  |  |  |  |  |  |
Unearned Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |
Related Party Agreement Expenditures Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due to Related Parties |  |  |  |  |  |  |  | 3,900,000 |  |  | $ 2,300,000 |  |  |  |  |
Employment Agreement Award [Member] | Corporate selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (expense) associated with the Employment Agreement Award |  |  |  |  |  |  |  | $ 100,000 |  | 600,000 |  |  |  |  |  |
MGM National Harbor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment owned |  |  |  | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000
Percentage of ownership of equity interest excluding interest in entity |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Other Income |  |  |  |  |  |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |
MGM National Harbor [Member] | Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of available for sale debt securities | $ 136,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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