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Acquisitions (Narrative) (Details) | 12 Months Ended
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Apr. 30, 2012 Y
Acquisitions [Abstract] |
Number of stores acquired | 35
Goodwill deductible for income tax purposes, period (years) | 15

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- Definition Goodwill Deductible For Income Tax Purposes, Period + References No definition available. + Details
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Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total number of stoes acquired through a variety of single and multi-store transactions. + References No definition available. + Details
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Namespace Prefix: | casy_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration