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Discontinued Operations (Details) $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 22, 2019 USD ($)	Jun. 29, 2018 USD ($)	Dec. 31, 2021 USD ($)	Oct. 30, 2021 USD ($) contract	Oct. 31, 2020 USD ($)	Oct. 30, 2021 USD ($) contract	Oct. 31, 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
Discontinued operations
Litigation reserve expense				$ 10,000
Amount of existing claims settled			$ 20,000
Payment period			24 months
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	$ 0	$ 0	$ 38
Holdback | Disposed of by sale
Discontinued operations
Cash consideration received				$ 6,500		$ 6,500
Number of remaining contracts | contract				2		2

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