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Description of Business (Details) ft² in Thousands										3 Months Ended				9 Months Ended		14 Months Ended
Description of Business (Details) ft² in Thousands	Oct. 02, 2020 USD ($) ft² game	Sep. 18, 2020	Sep. 11, 2020 USD ($)	Jun. 05, 2020 number_of_betting_facilities	Oct. 09, 2019 USD ($) a	Mar. 08, 2019 USD ($)	Mar. 06, 2019 USD ($)	Mar. 05, 2019 USD ($)	Jan. 11, 2019 USD ($)	Dec. 31, 2021 ft² game	Dec. 31, 2020 USD ($)	Sep. 30, 2020 game	Jun. 30, 2020 game	Sep. 30, 2020 USD ($) game racingDay	Sep. 30, 2019 USD ($)	Jun. 30, 2021 USD ($)	Mar. 16, 2020 USD ($)
Variable Interest Entity [Line Items]
Number of reportable segments \| game														3
Proceeds from new credit facilities														$ 726,000,000.0	$ 1,236,000,000.0
All Other \| Arlington International Racecourse
Variable Interest Entity [Line Items]
Number of spectator-free live racing days \| racingDay														18
Number of off-track facilities \| number_of_betting_facilities				4
Number of live racing days held \| game												12
Maximum patron capacity \| game														300
All Other \| Turfway Park
Variable Interest Entity [Line Items]
Number of spectator-free live racing days \| game														5
Number of live racing days held \| game														9
Number live racing days canceled \| racingDay														3
Churchill Downs Racetrack
Variable Interest Entity [Line Items]
Number of spectator-free live racing days \| game												14	27
Derby City Gaming
Variable Interest Entity [Line Items]
Patron capacity, percentage														0.75
Gaming capacity, percentage														0.66
Calder Casino and Racing
Variable Interest Entity [Line Items]
Gaming capacity, percentage														0.56
Fair Grounds and VSI
Variable Interest Entity [Line Items]
Patron capacity, percentage														0.25
Gaming capacity, percentage														0.75
Video Services, LLC
Variable Interest Entity [Line Items]
Patron capacity, percentage														0.50
Gaming capacity, percentage														0.75
Harlow’s
Variable Interest Entity [Line Items]
Patron capacity, percentage														0.50
Maximum gaming capacity, slots, percentage														0.66
Maximum gaming capacity, table games, percentage														0.60
Ocean Downs
Variable Interest Entity [Line Items]
Patron capacity, percentage														0.50
Maximum gaming capacity, table games, percentage														0.60
Maximum gaming capacity, video lottery terminals, percentage														0.70
Oxford
Variable Interest Entity [Line Items]
Maximum number of persons allowed on the gaming floor \| game														200
Presque Isle
Variable Interest Entity [Line Items]
Patron capacity, percentage														0.50
Maximum gaming capacity, slots, percentage														0.60
Maximum gaming capacity, table games, percentage														0.60
Riverwalk
Variable Interest Entity [Line Items]
Patron capacity, percentage														0.50
Maximum gaming capacity, slots, percentage														0.66
Maximum gaming capacity, table games, percentage														0.60
Lady Luck Nemacolin
Variable Interest Entity [Line Items]
Patron capacity, percentage														0.50
Maximum gaming capacity, slots, percentage														0.50
Maximum gaming capacity, table games, percentage														0.60
Oak Grove
Variable Interest Entity [Line Items]
Patron capacity, percentage		0.75
Gaming capacity, percentage		0.63
Revolving Credit Facility \| Line of Credit
Variable Interest Entity [Line Items]
Borrowings																	$ 675,400,000
Proceeds from new credit facilities														$ 622,000,000.0
Presque Isle Downs & Casino And Lady Luck Casino
Variable Interest Entity [Line Items]
Payments to acquire business									$ 178,900,000
Presque Isle
Variable Interest Entity [Line Items]
Working capital and other purchase price adjustments									$ 1,600,000
Lady Luck Nemacolin
Variable Interest Entity [Line Items]
Payments to acquire business						$ 100,000
Turfway Park
Variable Interest Entity [Line Items]
Payments to acquire business					$ 36,000,000.0
Working capital and other purchase price adjustments					900,000
Total consideration					$ 46,000,000.0
Area of land \| a					197
Rivers Casino Des Plaines
Variable Interest Entity [Line Items]
Patron capacity, percentage														0.25
Maximum gaming capacity, slots, percentage														0.75
Maximum gaming capacity, table games, percentage														0.45
Miami Valley Gaming LLC
Variable Interest Entity [Line Items]
Patron capacity, percentage														0.63
Maximum gaming capacity, video lottery terminals, percentage														0.67
Equity method investment, ownership percentage												50.00%		50.00%
WKY Development, LLC
Variable Interest Entity [Line Items]
Payments to acquire business			$ 3,000,000.0
Midwest Gaming Holdings, LLC
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage							61.30%	42.00%				61.30%		61.30%
Aggregated cash consideration paid at closing of the Sale Transaction								$ 406,600,000
Transaction costs								3,500,000
Deferred tax liability								103,200,000
Clairvest Group Inc.
Variable Interest Entity [Line Items]
Transaction costs								3,500,000
Subsequent Event \| Newport Racing and Gaming
Variable Interest Entity [Line Items]
Patron capacity, percentage	0.75
Payments to acquire business	$ 38,400,000
Business combination, future investment in acquisition extension, square foot of gaming floor \| ft²	17
Number of historical racing machines \| game	500
Subsequent Event \| Revolving Credit Facility \| Line of Credit
Variable Interest Entity [Line Items]
Minimum liquidity financial covenant																$ 150,000,000.0
Subsequent Event \| Turfway Park \| Forecast
Variable Interest Entity [Line Items]
Total consideration											$ 200,000,000.0
Business combination, future investment in acquisition extension, square foot of gaming floor \| ft²										155
Subsequent Event \| Turfway Park \| Maximum \| Forecast
Variable Interest Entity [Line Items]
Number of historical racing machines \| game										1,200
Midwest Gaming Holdings, LLC
Variable Interest Entity [Line Items]
Proceeds from new credit facilities							$ 300,000,000.0	$ 300,000,000.0
High Plaines \| Midwest Gaming Holdings, LLC
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage							36.00%
Casino Investors \| Midwest Gaming Holdings, LLC
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage							2.70%