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Acquisitions (Details) - 12 months ended Apr. 30, 2015 - store | Total
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Business Combinations [Abstract] |
Number of stores acquired | 36
Number of stores opened | 32
Number of stores closed | 3
Number of stores expected to open in next fiscal year | 1
Goodwill deductible for income tax purposes period (in years) | 15 years

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- Definition Goodwill deductible for income tax purposes, period. + References No definition available. + Details
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- Definition Number of stores closed. + References No definition available. + Details
Name: | casy_NumberOfStoresClosed
Namespace Prefix: | casy_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of stores expected to open in next fiscal year. + References No definition available. + Details
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- Definition Number of stores opened in the period. + References No definition available. + Details
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Namespace Prefix: | casy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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