Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 453,163	$ 448,583	$ 895,744	$ 838,670
Home center retailers
Disaggregation of Revenue [Line Items]
Net sales	215,342	223,118	424,666	397,113
Builders
Disaggregation of Revenue [Line Items]
Net sales	183,200	171,042	361,438	335,390
Independent dealers and distributors
Disaggregation of Revenue [Line Items]
Net sales	$ 54,621	$ 54,423	$ 109,640	$ 106,167