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Description of Business	12 Months Ended
Description of Business	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	DESCRIPTION OF BUSINESS Churchill Downs Incorporated (the "Company", "we", "us", "our") is an industry-leading racing, gaming and online entertainment company anchored by our iconic flagship event - The Kentucky Derby. We are a leader in brick-and-mortar casino gaming with approximately 9,030 gaming positions in seven states, and we are the largest, legal online account wagering platform for horseracing in the U.S. We are also one of the world's largest producers and distributors of mobile games. We were organized as a Kentucky corporation in 1928, and our principal executive offices are located in Louisville, Kentucky. We conduct our business through our operating segments and report our net revenue and operating expense associated with our operating segments in our accompanying Consolidated Statements of Comprehensive Income. Our operating segments are defined as follows: Racing: primarily commissions earned on wagering at our racetracks, off-track betting facilities ("OTBs"), simulcast fees earned from other wagering sites, and the operations include admissions, sponsorships and licensing rights, food and beverage services and alternative uses of our pari-mutuel facilities. Casinos: slot machines, table games, video poker ancillary food and beverage services and hotel and other miscellaneous operations. In addition, we include our 50% joint venture in Miami Valley Gaming ("MVG") and our 25% equity investment in Saratoga Casino Holdings LLC ("SCH"). TwinSpires: mobile and online pari-mutuel wagering business on TwinSpires.com; high dollar wagering by international customers ("Velocity"); and horseracing statistical data generated by our information business that provides data information and processing services to the equine industry. Big Fish Games: social casino, casual and mid-core free to play, and premium paid games for PC, Mac, and mobile devices. Other Investments: pari-mutuel wagering systems for racetracks and an Internet real-money gaming operation. Corporate: other revenue and general and administrative expense not allocated to our other operating segments.