Subsequent Events (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 30, 2020	Jul. 31, 2019	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018	Jun. 29, 2020
Subsequent Event [Line Items]
Restructuring charges, net	$ 200	$ 1,800		$ (18)	$ 1,987	$ 0
Forecast [Member]
Subsequent Event [Line Items]
Restructuring charges, net			$ 1,500
Minimum [Member] | Subsequent Event
Subsequent Event [Line Items]
Expected restructuring costs to be incurred							$ 3,000
Minimum [Member] | Subsequent Event | Employee Severance and Separation [Member]
Subsequent Event [Line Items]
Expected restructuring costs to be incurred							500
Minimum [Member] | Subsequent Event | Asset impairment [Member]
Subsequent Event [Line Items]
Expected restructuring costs to be incurred							2,500
Maximum [Member] | Subsequent Event
Subsequent Event [Line Items]
Expected restructuring costs to be incurred							5,000
Maximum [Member] | Subsequent Event | Employee Severance and Separation [Member]
Subsequent Event [Line Items]
Expected restructuring costs to be incurred							1,000
Maximum [Member] | Subsequent Event | Asset impairment [Member]
Subsequent Event [Line Items]
Expected restructuring costs to be incurred							$ 4,000