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Commitments (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Apr. 30, 2013 employee
Commitments [Abstract] |
Minimum aggregate base compensation per year exclusive of bonuses for executive officer | $ 660
Number of other key employees compensation agreements were entered into with | 11

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- Details
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Namespace Prefix: | casy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Compensation Commitment + References No definition available. + Details
Name: | casy_CompensationCommitment
Namespace Prefix: | casy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number Of Key Employees Compensation Agreements Were Entered Into + References No definition available. + Details
Name: | casy_NumberOfKeyEmployeesCompensationAgreementsWereEnteredInto
Namespace Prefix: | casy_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration