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Significant Accounting Policies (Schedule Of Depreciation Of Property, Plant And Equipment) (Details) | 12 Months Ended
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Apr. 30, 2013
Buildings [Member] | Minimum [Member] |
Significant Accounting Policies [Line Items] |
Useful life | 25 years
Buildings [Member] | Maximum [Member] |
Significant Accounting Policies [Line Items] |
Useful life | 40 years
Machinery and Equipment [Member] | Minimum [Member] |
Significant Accounting Policies [Line Items] |
Useful life | 5 years
Machinery and Equipment [Member] | Maximum [Member] |
Significant Accounting Policies [Line Items] |
Useful life | 30 years
Leasehold Interest In Property And Equipment [Member] |
Significant Accounting Policies [Line Items] |
Useful Life | Lesser of term of lease or life of asset
Leasehold Improvements [Member] |
Significant Accounting Policies [Line Items] |
Useful Life | Lesser of term of lease or life of asset

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

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- Definition Useful life. + References No definition available. + Details
Name: | casy_UsefulLife
Namespace Prefix: | casy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration