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Note 10 - Commitments (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Apr. 30, 2014
Disclosure Text Block Supplement [Abstract] |
CompensationCommitment | $ 660

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

X
- Details
Name: | us-gaap_DisclosureTextBlockSupplementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration