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HRE Trust Fund Proceeds (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Jul. 22, 2013 | Jul. 18, 2013
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HRE Trust Fund Proceeds [Line Items] |  |  |
HRE Trust Fund Proceeds | 15.00%chdn_HRETrustFundProceeds |  |
Gross Proceeds from HRE Trust |  | $ 23.0 chdn_GrossProceedsfromHRETrust | $ 7.9 chdn_GrossProceedsfromHRETrust
Other Income [Member] |  |  |
HRE Trust Fund Proceeds [Line Items] |  |  |
Gross Proceeds from HRE Trust |  |  | 4.2 chdn_GrossProceedsfromHRETrust / chdn_HRETrustAxis = us-gaap_OtherIncomeMember
Purses [Member] |  |  |
HRE Trust Fund Proceeds [Line Items] |  |  |
Gross Proceeds from HRE Trust |  |  | $ 3.6 chdn_GrossProceedsfromHRETrust / chdn_HRETrustAxis = chdn_PursesMember

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- Definition Gross Proceeds from HRE Trust + References No definition available. + Details
Name: | chdn_GrossProceedsfromHRETrust
Namespace Prefix: | chdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Proceeds received from the Illinois riverboat licenses under the HRE Trust + References No definition available. + Details
Name: | chdn_HRETrustFundProceeds
Namespace Prefix: | chdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | chdn_HRETrustFundProceedsLineItems
Namespace Prefix: | chdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | chdn_HRETrustAxis=chdn_PursesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | chdn_HRETrustAxis=us-gaap_OtherIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |