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Note 7 - Acquisitions (Details Textual)	3 Months Ended
	Jul. 31, 2014
Goodwill Deductible for Income Tax Purposes Period	15 years
Stores [Member]
Number of Businesses Acquired	25

X

- Definition

Goodwill deductible for income tax purposes, period.

+ References

No definition available.

+ Details

Name:	casy_GoodwillDeductibleForIncomeTaxPurposesPeriod
Namespace Prefix:	casy_
Data Type:	xbrli:durationItemType
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