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Presentation of Financial Statements	6 Months Ended
Presentation of Financial Statements	Oct. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Presentation of Financial Statements	Presentation of Financial Statements Casey’s General Stores, Inc. and its subsidiaries (hereinafter referred to as the "Company" or "Casey’s") operate 2,181 convenience stores in 16 Midwest states. The stores are located primarily in smaller communities, many with populations of less than 5,000. The accompanying condensed consolidated financial statements include the accounts and transactions of Casey's General Stores, Inc. and its direct and indirect wholly-owned subsidiaries. All material inter-company balances and transactions have been eliminated in consolidation.