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Note 6 - Acquisitions (Details)	3 Months Ended
	Jul. 31, 2014
Note 6 - Acquisitions (Details) [Line Items]
Goodwill Deductible for Income Tax Purposes Period	15 years
Stores [Member]
Note 6 - Acquisitions (Details) [Line Items]
Number of Businesses Acquired	25

X

- Definition

Goodwill deductible for income tax purposes, period.

+ References

No definition available.

+ Details

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Namespace Prefix:	casy_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	casy_Note6AcquisitionsDetailsLineItems
Namespace Prefix:	casy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfBusinessesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration