Segments - Net Sales by Main Product Lines (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Revenue from external customers
Total net sales	$ 1,234,618	$ 1,153,595	$ 4,025,150	$ 3,346,222
Wallboard
Revenue from external customers
Total net sales	500,710	415,132	1,606,821	1,219,789
Ceilings
Revenue from external customers
Total net sales	146,810	139,894	473,686	418,831
Steel framing
Revenue from external customers
Total net sales	234,451	282,764	787,499	751,040
Complementary products
Revenue from external customers
Total net sales	$ 352,647	$ 315,805	$ 1,157,144	$ 956,562