Segments - Net Sales of Complementary Products (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2025	Jan. 31, 2025	Oct. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Jan. 31, 2024	Oct. 31, 2023	Jul. 31, 2023	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Revenue from External Customer [Line Items]
Total net sales	$ 1,333,796	$ 1,260,710	$ 1,470,776	$ 1,448,456	$ 1,413,029	$ 1,258,348	$ 1,420,930	$ 1,409,600	$ 5,513,738	$ 5,501,907	$ 5,329,252
Complementary products
Revenue from External Customer [Line Items]
Total net sales									1,725,908	1,650,689	1,537,617
Tools and fasteners
Revenue from External Customer [Line Items]
Total net sales									345,023	346,482	319,466
Insulation
Revenue from External Customer [Line Items]
Total net sales									362,175	320,209	293,755
Joint treatment
Revenue from External Customer [Line Items]
Total net sales									289,823	265,086	240,988
Lumber
Revenue from External Customer [Line Items]
Total net sales									159,675	151,457	147,507
EIFS/stucco
Revenue from External Customer [Line Items]
Total net sales									209,668	178,948	145,517
Other
Revenue from External Customer [Line Items]
Total net sales									$ 359,544	$ 388,507	$ 390,384