Segments - Net Sales by Main Product Lines (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Revenue from external customers
Total net sales	$ 1,258,348	$ 1,234,618	$ 4,088,878	$ 4,025,150
Wallboard
Revenue from external customers
Total net sales	520,686	500,710	1,677,285	1,606,821
Complementary products
Revenue from external customers
Total net sales	378,555	352,647	1,233,084	1,157,144
Steel framing
Revenue from external customers
Total net sales	203,363	234,451	672,231	787,499
Ceilings
Revenue from external customers
Total net sales	$ 155,744	$ 146,810	$ 506,278	$ 473,686