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Restructuring - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2021 | Jul. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges, net | $ 313 | $ 3,460
Manufacturing Plant Closure |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges, net | 300 | $ 1,800
Facility Closing | Discontinued Operations, Disposed of by Sale | Humboldt Facility |  |
Restructuring Cost and Reserve [Line Items] |  |
Gain (Loss) on Disposition of Business | 2,300 |
Employee Severance | Nationwide Reductions In Force |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges, net | $ 1,700 |

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