Segments - Net Sales of Complementary Products (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Revenue from external customers
Net sales	$ 1,470,776	$ 1,420,930	$ 2,919,232	$ 2,830,530
Complementary products
Revenue from external customers
Net sales	466,828	428,319	910,341	854,529
Tools and fasteners
Revenue from external customers
Net sales	89,743	86,366	180,912	170,041
Insulation
Revenue from external customers
Net sales	100,842	82,068	185,885	160,455
Joint treatment
Revenue from external customers
Net sales	76,228	67,414	151,517	132,696
Lumber
Revenue from external customers
Net sales	42,295	40,437	85,318	82,511
EIFS/stucco
Revenue from external customers
Net sales	55,664	47,408	106,616	93,704
Other
Revenue from external customers
Net sales	$ 102,056	$ 104,626	$ 200,093	$ 215,122