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Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 30, 2022 | Apr. 30, 2021
Loss Contingency [Abstract] |  |
Accrued environmental liability | $ 274 | $ 368
Loss Contingencies [Line Items] |  |
Letters of credit outstanding | 5,492 |
Self insurance reserve | 53,752 | $ 50,526
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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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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