SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 08, 2024	Feb. 29, 2024	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Feb. 15, 2024	Jan. 31, 2021	Jan. 25, 2021
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees			$ 9,200,000	$ 9,200,000
Revenue from Contract with Customer, Including Assessed Tax			104,410,000	109,869,000
Redeemable noncontrolling interest			8,364,000		$ 16,520,000
Aggregate amortization expense for produced content assets			8,100,000	6,900,000
Aggregate amortization expense for acquired content assets			3,300,000	6,300,000
Amortization of content assets			$ 11,444,000	13,158,000
Percentage Of Award Amount			4.00%		4.00%
Other current liabilities			$ 40,269,000		$ 42,831,000
Impairment of goodwill, intangible assets, and long-lived assets			0	16,775,000
Other Liabilities, Current			40,269,000		$ 42,831,000
Churchill Downs Incorporated
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Partnership investment ownership percentage						50.00%
Customer advances and unearned income
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Contract with customer liability revenue recognized			2,000,000.0
Reserve for audience deficiency
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Contract with customer liability revenue recognized			1,000,000.0
Unearned event income
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenue from Contract with Customer, Including Assessed Tax			0
Event revenues & other
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenue from Contract with Customer, Including Assessed Tax			1,734,000	1,782,000
Continuing Operations [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Marketing and Advertising Expense			$ 7,000,000.0	7,100,000
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
Remaining weighted-average amortization period			2 years 7 months 6 days		2 years 10 months 24 days
Amortization of Intangible Assets			$ 1,200,000	1,200,000
7.375% Senior Secured Notes due February 2028
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross			650,000,000.0		$ 725,000,000.0
Fair value of debt			$ 553,300,000		$ 616,300,000
Debt Instrument, Interest Rate, Stated Percentage			7.375%		7.375%		7.375%	7.375%
Face amount of debt								$ 825,000,000.0
ABL Facility
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Borrowings outstanding			$ 0		$ 0
Annual Fund-Raising Event | Tom Joyner Foundation Inc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Amount receivable from related party			4,200,000		1,000,000.0
Performance Rights | Alfred C. Liggins, President and Chief Executive Officer
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Other current liabilities					300,000
Related party expenses incurred			800,000	$ 800,000
Other Liabilities, Current					300,000
Sale of BMI | Alfred C. Liggins, President and Chief Executive Officer
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Cash proceeds sale of equity interest in BMI	$ 800,000
Past financial services and administrative support | Chief Executive Officer
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Amount receivable from related party			$ 200,000		200,000
RVAEH
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Investment purchased		$ 600,000
Equity Method Investments					$ 0.0