Restructuring - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	$ 2,791	$ (188)	$ 6,251	$ (207)
Manufacturing Plant Closure
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	2,900		4,700
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	1,736
Employee Severance | Nationwide Reductions In Force
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	$ (100)		1,600
Employee Severance | Manufacturing Plant Closure
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net			800
Other Restructuring | Manufacturing Plant Closure
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net			$ 3,900
Minimum | Manufacturing Plant Closure
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs					$ 3,000
Minimum | Employee Severance | Manufacturing Plant Closure
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs					500
Minimum | Other Restructuring | Manufacturing Plant Closure
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs					2,500
Maximum | Manufacturing Plant Closure
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs					5,000
Maximum | Employee Severance | Manufacturing Plant Closure
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs					1,000
Maximum | Other Restructuring | Manufacturing Plant Closure
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs					$ 4,000