Assets Held for Sale - Additional information (Details) - USD ($) $ in Thousands		3 Months Ended
	Jul. 06, 2018	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Aug. 10, 2018	Feb. 28, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairment charges		$ 958		$ 9,815
Nemacolin
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (loss) on sale		500
Disposal Group, Held-for-sale, Not Discontinued Operations | Churchill Downs Incorporated
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Termination fee	$ 5,000
Disposal Group, Held-for-sale, Not Discontinued Operations | Nemacolin
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash consideration on sale of assets and liabilities					$ 100
Impairment charge of net assets being sold			$ 3,800
Vicksburg's | Churchill Downs Incorporated
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairment charges		9,800
Presque Isle Downs
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (loss) on sale		$ 21,600
Presque Isle Downs | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash consideration on sale of assets and liabilities						$ 178,900
Vicksburg | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash consideration on sale of assets and liabilities						$ 50,600