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Contingencies (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2021
employee
Apr. 30, 2023
USD ($)
Apr. 30, 2022
USD ($)
Loss Contingency [Abstract]      
Accrued environmental liability   $ 268 $ 274
Loss Contingencies [Line Items]      
Payment received   15,297  
Self insurance reserve   61,168 $ 53,752
Pending Litigation | McColley V Casey's General Stores Inc      
Loss Contingencies [Line Items]      
Number of plaintiffs | employee 1,400    
General Liability and Auto Liability Insurance      
Loss Contingencies [Line Items]      
Annual stop loss limit   2,000  
Workers' Compensation Insurance      
Loss Contingencies [Line Items]      
Annual stop loss limit   $ 1,000