Document And Entity Information	6 Months Ended
	Oct. 31, 2014	Dec. 02, 2014
Entity Registrant Name	Caseys General Stores Inc,
Entity Central Index Key	0000726958
Current Fiscal Year End Date	--04-30
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		38,729,197
Document Type	10-Q
Document Period End Date	Oct. 31, 2014
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Amendment Flag	false