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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 |

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