Basis Of Presentation	6 Months Ended
Jun. 30, 2018
Basis of Presentation [Abstract]
Basis of Presentation and Significant Accounting Policies [Text Block]	Basis of Presentation The Churchill Downs Incorporated (the "Company", "we", "us", "our") financial statements are presented in conformity with the requirements of this Quarterly Report on Form 10-Q and consequently do not include all of the disclosures normally required by U.S. generally accepted accounting principles ("GAAP") or those normally made in our Annual Report on Form 10-K. The December 31, 2017 condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP. On November 29, 2017, the Company entered into a definitive Stock Purchase Agreement (the "Stock Purchase Agreement") to sell its mobile gaming subsidiary, Big Fish Games, Inc., a Washington corporation ("Big Fish Games"), to Aristocrat Technologies, Inc., a Nevada corporation (the "Purchaser"), an indirect, wholly owned subsidiary of Aristocrat Leisure Limited, an Australian corporation (the "Big Fish Transaction"). On January 9, 2018, pursuant to the Stock Purchase Agreement, the Company completed the Big Fish Transaction. The Purchaser paid an aggregate consideration of $990.0 million in cash in connection with the Big Fish Transaction, subject to customary adjustments for working capital and indebtedness and certain other adjustments as set forth in the Stock Purchase Agreement. The Big Fish Games segment and related Big Fish Transaction meet the criteria for held for sale and discontinued operation presentation. Accordingly, the condensed consolidated statements of comprehensive income, condensed consolidated balance sheets, and the notes to financial statements reflect the Big Fish Games segment as discontinued operations for all periods presented. Unless otherwise specified, disclosures in these condensed consolidated financial statements reflect continuing operations only. The condensed consolidated statements of cash flows include both continuing and discontinued operations. Refer to Note 5, Discontinued Operations, for further information on the discontinued operations relating to the Big Fish Transaction. The following information is unaudited. All per share amounts assume dilution unless otherwise noted. This report should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2017. In the opinion of management, all adjustments necessary for a fair statement of this information have been made, and all such adjustments are of a normal, recurring nature. Seasonality Racing Due to the seasonal nature of our live racing business, revenue and operating results for any interim quarter are generally not indicative of the revenues and operating results for the year and may not be comparable with results for the corresponding period of the previous year. Historically, we have had fewer live racing days during the first quarter of each year, and the majority of our live racing revenue occurs during the second quarter, with the running of the Kentucky Derby and the Kentucky Oaks. We conducted 64 live thoroughbred race days in the second quarter of 2018 and 2017. For the six months ended June 30, 2018, we conducted 118 live thoroughbred race days, compared to 119 live thoroughbred race days during the six months ended June 30, 2017. TwinSpires Due to the seasonal nature of the racing business, revenue and operating results for any interim quarter are generally not indicative of the revenues and operating results for the year and may not be comparable with results for the corresponding period of the previous year. Historically, our revenue is higher in the second quarter with the running of the Kentucky Derby and the Kentucky Oaks. Casino Revenue from our casino properties has a seasonal component and is typically higher during the first and second quarters.

Basis of Presentation

The Churchill Downs Incorporated (the "Company", "we", "us", "our") financial statements are presented in conformity with the requirements of this Quarterly Report on Form 10-Q and consequently do not include all of the disclosures normally required by U.S. generally accepted accounting principles ("GAAP") or those normally made in our Annual Report on Form 10-K. The December 31, 2017 condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP.

On November 29, 2017, the Company entered into a definitive Stock Purchase Agreement (the "Stock Purchase Agreement") to sell its mobile gaming subsidiary, Big Fish Games, Inc., a Washington corporation ("Big Fish Games"), to Aristocrat Technologies, Inc., a Nevada corporation (the "Purchaser"), an indirect, wholly owned subsidiary of Aristocrat Leisure Limited, an Australian corporation (the "Big Fish Transaction"). On January 9, 2018, pursuant to the Stock Purchase Agreement, the Company completed the Big Fish Transaction. The Purchaser paid an aggregate consideration of $990.0 million in cash in connection with the Big Fish Transaction, subject to customary adjustments for working capital and indebtedness and certain other adjustments as set forth in the Stock Purchase Agreement.

The Big Fish Games segment and related Big Fish Transaction meet the criteria for held for sale and discontinued operation presentation. Accordingly, the condensed consolidated statements of comprehensive income, condensed consolidated balance sheets, and the notes to financial statements reflect the Big Fish Games segment as discontinued operations for all periods presented. Unless otherwise specified, disclosures in these condensed consolidated financial statements reflect continuing operations only. The condensed consolidated statements of cash flows include both continuing and discontinued operations. Refer to Note 5, Discontinued Operations, for further information on the discontinued operations relating to the Big Fish Transaction.

The following information is unaudited. All per share amounts assume dilution unless otherwise noted. This report should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2017.

In the opinion of management, all adjustments necessary for a fair statement of this information have been made, and all such adjustments are of a normal, recurring nature.

Seasonality

Racing

Due to the seasonal nature of our live racing business, revenue and operating results for any interim quarter are generally not indicative of the revenues and operating results for the year and may not be comparable with results for the corresponding period of the previous year. Historically, we have had fewer live racing days during the first quarter of each year, and the majority of our live racing revenue occurs during the second quarter, with the running of the Kentucky Derby and the Kentucky Oaks. We conducted 64 live thoroughbred race days in the second quarter of 2018 and 2017. For the six months ended June 30, 2018, we conducted 118 live thoroughbred race days, compared to 119 live thoroughbred race days during the six months ended June 30, 2017.

TwinSpires

Due to the seasonal nature of the racing business, revenue and operating results for any interim quarter are generally not indicative of the revenues and operating results for the year and may not be comparable with results for the corresponding period of the previous year. Historically, our revenue is higher in the second quarter with the running of the Kentucky Derby and the Kentucky Oaks.

Casino

Revenue from our casino properties has a seasonal component and is typically higher during the first and second quarters.