Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Disaggregation of Revenue [Line Items]
Net Sales	$ 1,744,014	$ 1,650,333	$ 1,645,319
Home center retailers
Disaggregation of Revenue [Line Items]
Net Sales	848,898	768,043	788,803
Builders
Disaggregation of Revenue [Line Items]
Net Sales	673,307	668,765	631,474
Independent dealers and distributors
Disaggregation of Revenue [Line Items]
Net Sales	$ 221,809	$ 213,525	$ 225,042