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Basis Of Presentation (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 D | Jun. 30, 2011 D | Jun. 30, 2012 D | Jun. 30, 2011 D | Dec. 31, 2011
Promotional Allowance [Line Items] |  |  |  |  |
Live Racing Days | 122 | 105 | 178 | 167 |
Customer Loyalty Program Liability | $ 1.9 |  | $ 1.9 |  | $ 2.7
Promotional Allowances | 9.3 | 5.1 | 15.5 | 10.3 |
Estimated Cost Of Providing Promotional Allowances | 1.2 | 0.8 | 2.4 | 2.1 |
Racing Operations |  |  |  |  |
Promotional Allowance [Line Items] |  |  |  |  |
Promotional Allowances | 0.3 | 0.6 | 0.5 | 1.0 |
Online Operations |  |  |  |  |
Promotional Allowance [Line Items] |  |  |  |  |
Promotional Allowances | 6.5 | 2.8 | 10.0 | 5.2 |
Gaming Operations |  |  |  |  |
Promotional Allowance [Line Items] |  |  |  |  |
Promotional Allowances | $ 2.5 | $ 1.7 | $ 5.0 | $ 4.1 |

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- Definition Customer Loyalty Program Liability + References No definition available. + Details
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Namespace Prefix: | chdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Estimated Cost Of Providing Promotional Allowances + References No definition available. + Details
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Namespace Prefix: | chdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Live Racing Days + References No definition available. + Details
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Namespace Prefix: | chdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Details
Name: | chdn_PromotionalAllowanceLineItems
Namespace Prefix: | chdn_
Data Type: | xbrli:stringItemType
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- Definition This element represents the estimated retail value of accommodations, food and beverage, and other services furnished to guests without charge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 605 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6472957&loc=d3e51325-107943 + Details
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