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Restructuring Charges (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2021 | Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges, net |  | $ 183,000 | $ 5,848,000 | $ (18,000)
Manufacturing Plant Closure |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges, net |  | 300,000 | 4,400,000 |
Nationwide Reductions In Force | Employee Severance and Separation [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges, net |  | $ (100,000) | $ 1,400,000 | $ 200,000
Discontinued Operations, Disposed of by Sale | Humboldt Facility | Facility Closing |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Gain (Loss) on Disposition of Business | $ 2,300,000 |  |  |

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