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HRE Trust Fund Proceeds (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2013 | Jul. 10, 2013
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HRE Trust Fund Proceeds [Line Items] |  |  |
HRE Trust Fund Proceeds | 15.00% |  |
Gross Proceeds from HRE Trust |  | $ 7.9 | $ 23.0
Purses |  |  |
HRE Trust Fund Proceeds [Line Items] |  |  |
Gross Proceeds from HRE Trust |  | 3.6 |
Other Income |  |  |
HRE Trust Fund Proceeds [Line Items] |  |  |
Gross Proceeds from HRE Trust |  | $ 4.2 |

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

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- Definition [Line Items] for HRE Trust Fund Proceeds [Table] + References No definition available. + Details
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Namespace Prefix: | chdn_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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