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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018 | Apr. 30, 2019
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | $ 477,792 |  | $ 477,792 |  | $ 462,943
Less accumulated amortization and depreciation | (270,893) |  | (270,893) |  | (254,680)
Property, Plant and Equipment, Net, Total | 206,899 |  | 206,899 |  | 208,263
Amortization and depreciation expense on property, plant and equipment | 9,200 | $ 9,000 | 18,300 | $ 17,800 |
Accumulated amortization on capital leases | 31,400 |  | 31,400 |  | 30,800
Land |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | 4,431 |  | 4,431 |  | 4,751
Buildings and improvements |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | 114,794 |  | 114,794 |  | 114,421
Buildings and improvements - finance leases |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | 11,202 |  | 11,202 |  | 11,202
Machinery and equipment |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | 304,075 |  | 304,075 |  | 294,993
Machinery and equipment - finance leases |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | 30,649 |  | 30,649 |  | 30,574
Construction in progress |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | $ 12,641 |  | $ 12,641 |  | $ 7,002

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