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Commitments (Details) | 12 Months Ended
--- | ---
Apr. 30, 2015 USD ($) | Apr. 30, 2014 employee
Other Commitments |  |
Number of other key employees covered by employment agreements |  | 15
Minimum |  |
Other Commitments |  |
Compensation commitment | $ | $ 660,000 |

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

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- Definition Employment Agreements, Number of Employees + References No definition available. + Details
Name: | casy_EmploymentAgreementsNumberofEmployees
Namespace Prefix: | casy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |