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Operating Leases - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2002
Leases [Abstract] |  |  |  |
Total rent expense for all operating leases | $ 16,000,000 | $ 18,300,000 | $ 18,900,000 |
Payment to re-acquire Churchill Downs facility in future period |  |  |  | $ 1.00

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- Definition Payment to Re-Acquire Churchill Downs Facility In Future Period + References No definition available. + Details
Name: | chdn_PaymenttoReAcquireChurchillDownsFacilityInFuturePeriod
Namespace Prefix: | chdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration