Number Of Casinos

No definition available.

Name:	chdn_NumberOfCasinos
Namespace Prefix:	chdn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of States With Gaming Positions

+ References

No definition available.

+ Details

Name:	chdn_NumberOfStatesWithGamingPositions
Namespace Prefix:	chdn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Gaming Locations

+ References

No definition available.

+ Details

Name:	chdn_NumberofGamingLocations
Namespace Prefix:	chdn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Online Real-Money Sports Betting And iGaming Agreement Term

+ References

No definition available.

+ Details

Name:	chdn_OnlineRealMoneySportsBettingAndiGamingAgreementTerm
Namespace Prefix:	chdn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

+ Details

Name:	us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=chdn_OceanDownsLLCandRacingServicesLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=chdn_SaratogaCasinoHoldingsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=chdn_MiamiValleyGamingLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=chdn_CasinoSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=chdn_BigFishGamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=stpr_MS
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Description of Business - Additional Information (Details) $ in Millions				1 Months Ended	12 Months Ended
	Oct. 31, 2018	Jul. 16, 2018	Jan. 09, 2018 USD ($)	Aug. 31, 2018 casino	Dec. 31, 2018 USD ($) state gaming_location	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2012
Variable Interest Entity [Line Items]
Number of gaming locations \| gaming_location					9,500
Number of states with gaming positions \| state					7
Proceeds from sale of Big Fish Games			$ 970.7		$ 970.7	$ 0.0	$ 0.0
Online real-money sports betting and iGaming agreement term		15 years
Stock split, conversion ratio	3
Ocean Downs and Racing Services
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage		50.00%		100.00%
Saratoga Casino Holdings LLC
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage		25.00%
Miami Valley Gaming LLC
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage					50.00%			50.00%
Miami Valley Gaming LLC \| Casino
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage					50.00%
Big Fish Games
Variable Interest Entity [Line Items]
Proceeds from sale of Big Fish Games			$ 990.0
MISSISSIPPI
Variable Interest Entity [Line Items]
Number of casinos \| casino				2