Segments - Net Sales of Complementary Products (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Revenue from external customers
Net sales	$ 1,260,710	$ 1,258,348	$ 4,179,942	$ 4,088,878
Complementary products
Revenue from external customers
Net sales	398,647	378,555	1,308,988	1,233,084
Tools and fasteners
Revenue from external customers
Net sales	80,326	85,164	261,238	255,204
Insulation
Revenue from external customers
Net sales	92,045	78,552	277,930	239,007
Joint treatment
Revenue from external customers
Net sales	65,454	61,219	216,971	193,915
Lumber
Revenue from external customers
Net sales	36,169	31,134	121,487	113,645
EIFS/stucco
Revenue from external customers
Net sales	47,165	38,349	153,781	132,053
Other
Revenue from external customers
Net sales	$ 77,488	$ 84,137	$ 277,581	$ 299,260