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Restructuring Charges (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2022 | Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges, net |  | $ 1,525 | $ 183 | $ 5,848
Restructuring reserve |  | 800 |  |
Employee Severance and Separation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges, net |  | $ 1,500 |  |
Manufacturing Plant Closure |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges, net |  |  | $ 300 | $ 4,400
Discontinued Operations, Disposed of by Sale | Humboldt Facility | Facility Closing |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Gain (Loss) on Disposition of Business | $ 2,300 |  |  |

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