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Discontinued Operations (Details) $ in Thousands			3 Months Ended		12 Months Ended
	Feb. 22, 2019 USD ($)	Jun. 29, 2018 USD ($)	Jul. 31, 2021 USD ($) contract	Aug. 01, 2020 USD ($)	Apr. 30, 2021 USD ($)	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)
Other expense
Discontinued operations
Litigation reserve expense					$ 9,300
Discontinued Operations
Discontinued operations
Amount of alleged damages	$ 6,500
EES Business | Disposed of by sale
Discontinued operations
Cash consideration received		$ 31,994
Gain on sale of business		$ 11,420					$ (486)
Working capital dispute						$ 922
Amounts recorded in the consolidated financial statements						$ 341
EES Business | Disposed of by sale | Other income, net
Discontinued operations
Net Sales			$ 0	$ 38
Holdback | Disposed of by sale
Discontinued operations
Cash consideration received			$ 6,500
Number of remaining contracts | contract			2

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