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Discontinued Operations (Details)			3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 22, 2019 USD ($)	Jun. 29, 2018 USD ($)	Jan. 30, 2021 USD ($) contract	Jan. 25, 2020 USD ($)	Jan. 30, 2021 USD ($) contract	Jan. 25, 2020 USD ($)	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)
Discontinued operations
Amount of alleged damages	$ 6,500,000
EES Business | Disposed of by sale
Discontinued operations
Cash consideration received		$ 31,994,000
Gain on sale of business		11,420,000
Amount of reduction to gain resulting from a working capital adjustment								$ 486,000
Working capital dispute							$ 922,000
Amounts recorded in the consolidated financial statements							$ 341,000
EES Business | Disposed of by sale | Other income (expense)
Statement of operations
Net Sales			$ 0	$ 57,000	$ 38,000	$ 545,000
Holdback | Disposed of by sale
Discontinued operations
Cash consideration received		$ 6,500,000
Number of remaining contracts | contract			2		2

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