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Presentation of Financial Statements	6 Months Ended
Presentation of Financial Statements	Oct. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Presentation of Financial Statements	Presentation of Financial Statements The accompanying condensed consolidated financial statements include the accounts and transactions of Casey's General Stores, Inc. (hereinafter referred to as the Company or Casey's) and its wholly-owned subsidiaries. All material inter-company balances and transactions have been eliminated in consolidation.