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Contingencies (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 30, 2018 USD ($) state | Apr. 30, 2017 USD ($)
Loss Contingency [Abstract] |  |
Accrued environmental liability | $ 260 | $ 283
Annual stop loss limit | 1,000 |
Letters of credit outstanding | 21,118 | 21,126
Investments In escrow for insurance | $ 224 |
Number of states that require partial self-insurance | state | 1 |
Self insurance reserve | $ 39,777 | $ 37,984

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- Definition Investments In Escrow For Insurance + References No definition available. + Details
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- Definition Number Of States The Entity Operates In That Require Partial Self-Insurance + References No definition available. + Details
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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=6877327&loc=d3e13212-122682 + Details
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