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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Apr. 30, 2021
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | $ 513,631 |  | $ 501,596
Less accumulated amortization and depreciation | (306,699) |  | (297,594)
Property, Plant and Equipment, Net, Total | 206,932 |  | 204,002
Amortization and depreciation expense on property, plant and equipment | 9,600 | $ 11,600 |
Accumulated amortization on capital leases | 33,500 |  | 33,000
Humboldt Facility |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation |  | $ 1,100 |
Land |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 4,431 |  | 4,431
Buildings and improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 116,851 |  | 116,103
Buildings and improvements - finance leases |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 11,636 |  | 11,636
Machinery and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 318,651 |  | 315,371
Machinery and equipment - finance leases |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 31,912 |  | 31,386
Construction in progress |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | $ 30,150 |  | $ 22,669

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