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Commitments and Contingencies (Details) - USD ($) | Apr. 30, 2021 | Apr. 30, 2020
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Commitments and Contingencies |  |
Letters of credit outstanding | $ 5,029,000 | $ 2,716,000
Reserve for incurred cost claim audits | $ 0 | $ 0

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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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