| **Related Party Transactions - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions** | Feb. 01, 2021 | Apr. 28, 2020 |
|------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| Revolving Credit Facility | Line of Credit                                                                                         |          |          |
| **Related Party Transaction [Line Items]**                                                                                         |          |          |
| Debt covenant, restricted payments                                                                                                 | $ 226.0       | $ 26.0        |
| Private Placement                                                                                                                  |          |          |
| **Related Party Transaction [Line Items]**                                                                                         |          |          |
| Stock repurchase (in shares)                                                                                                       | 1             |          |
| Stock repurchase price (in dollars per share)                                                                                      | $ 193.94      |          |
| Private Placement | Affiliate Of Duchossois Group, Inc.                                                                            |          |          |
| **Related Party Transaction [Line Items]**                                                                                         |          |          |
| Aggregate purchase price                                                                                                           | $ 193.9       |          |

| X                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Debt Instrument, Restrictive Covenants, Restricted Payment Capacity
+ References
No definition available.
+ Details**Name:**chdn_DebtInstrumentRestrictiveCovenantsRestrictedPaymentCapacity**Namespace Prefix:**chdn_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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_RelatedPartyTransactionLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Cash received on stock transaction after deduction of issuance costs.
+ References
No definition available.
+ Details**Name:**us-gaap_SaleOfStockConsiderationReceivedOnTransaction**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.
+ References
No definition available.
+ Details**Name:**us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction**Namespace Prefix:**us-gaap_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.
+ References
No definition available.
+ Details**Name:**us-gaap_SaleOfStockPricePerShare**Namespace Prefix:**us-gaap_**Data Type:**dtr-types:perShareItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**srt_CounterpartyNameAxis=chdn_AffiliateOfDuchossoisGroupIncMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |