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Restructuring - Restructuring Charges Reserve (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Restructuring Reserve [Roll Forward]
Expense	$ 2,791	$ (188)	$ 6,251	$ (207)
Employee Severance
Restructuring Reserve [Roll Forward]
Restructuring reserve balance at May 1			189
Expense	1,736
Payments and adjustments	(1,502)
Restructuring reserve balance at October 31	$ 423		$ 423