Restructuring - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	$ (3)	$ 2,791	$ 310	$ 6,251
Manufacturing Plant Closure
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	$ 0	2,900	$ 300	4,700
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		$ (100)		$ 1,600