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v3.7.0.1

Commitments (Details) | 12 Months Ended
--- | ---
Apr. 30, 2017 USD ($) employee
Other Commitments |
Number of other key employees covered by employment agreements | employee | 14
Minimum |
Other Commitments |
Compensation commitment | $ | $ 900,000

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

X
- 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

X
- 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

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