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Restructuring - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2022 | Jan. 31, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges, net | $ (127) | $ (847) | $ 183 | $ 5,404
Facility Closing | Discontinued Operations, Disposed of by Sale | Humboldt Facility |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Gain on disposition of business |  | 2,300 |  |
Manufacturing Plant Closure |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges, net | 0 | (700) | 300 | 3,900
Employee Severance | Nationwide Reductions In Force |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges, net | $ (100) | $ (100) | $ (100) | $ 1,500

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