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Document And Entity Information (USD $)
 12 Months Ended
Apr. 30, 2014
Jun. 23, 2014
Oct. 31, 2013
Document and Entity Information [Abstract]      
Entity Registrant Name Caseys General Stores Inc,    
Document Type 10-K    
Current Fiscal Year End Date --04-30    
Entity Common Stock, Shares Outstanding   37,882,157  
Entity Public Float     $ 2,600,000,000
Amendment Flag false    
Entity Central Index Key 0000726958    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Well-known Seasoned Issuer Yes    
Document Period End Date Apr. 30, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY