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Commitments and Contingencies (Details) - USD ($)	Apr. 30, 2021	Apr. 30, 2020
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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- References

No definition available.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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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

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