Business Combinations - Narrative (Details) $ in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Apr. 30, 2025 USD ($)	Jan. 31, 2025 USD ($)	Oct. 31, 2024 USD ($)	Jul. 31, 2024 USD ($)	Apr. 30, 2024 USD ($)	Jan. 31, 2024 USD ($)	Oct. 31, 2023 USD ($)	Jul. 31, 2023 USD ($)	Apr. 30, 2025 USD ($)	Apr. 30, 2024 USD ($)	Apr. 30, 2023 USD ($)	Apr. 30, 2025 CAD ($)	Aug. 26, 2024 location	Jul. 02, 2024 USD ($) location	Jul. 02, 2024 CAD ($) location	May 01, 2024 USD ($)	Mar. 01, 2024 USD ($) facility	May 01, 2023	Apr. 03, 2023 USD ($)
Business Acquisition [Line Items]
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
Net income	26,094	$ (21,409)	$ 53,536	$ 57,248	56,387	$ 51,905	$ 80,957	$ 86,830	115,469	276,079	332,991
Transaction costs									$ 3,920	$ 4,856	1,961
Estimated useful life (in years)									13 years 1 month 6 days	13 years 1 month 6 days
Customer relationships
Business Acquisition [Line Items]
Estimated useful life (in years)									12 years 9 months 18 days	12 years 9 months 18 days
Trade names
Business Acquisition [Line Items]
Estimated useful life (in years)									15 years 4 months 24 days	15 years 4 months 24 days
Fiscal 2025 Acquisitions
Business Acquisition [Line Items]
Net sales									$ 166,800
Net income									2,900
Fair value of consideration transferred									238,798
Contingent consideration									26,648
Goodwill not expected to be deductible for U.S. federal income tax purposes	39,100								39,100
Goodwill expected to be deductible for U.S. federal income tax purposes	31,900								$ 31,900
Estimated useful life (in years)									11 years 10 months 24 days
Trade accounts and notes receivable	52,553								$ 52,553							$ 51,721
Trade accounts and notes receivable, gross	52,800								$ 52,800
Fiscal 2025 Acquisitions | Customer relationships
Business Acquisition [Line Items]
Estimated useful life (in years)									11 years 7 months 6 days
Fiscal 2025 Acquisitions | Trade names
Business Acquisition [Line Items]
Estimated useful life (in years)									15 years
Yvon
Business Acquisition [Line Items]
Outstanding common stock purchased (as a percent)														100.00%	100.00%
Contingent consideration arrangement term														5 years	5 years
Number of locations | location														7	7
Yvon | Minimum
Business Acquisition [Line Items]
Contingent consideration	0								$ 0					$ 0
Yvon | Maximum
Business Acquisition [Line Items]
Contingent consideration	$ 33,500								$ 33,500			$ 46.0		$ 33,500	$ 46.0
R.S. Elliott Specialty Supply
Business Acquisition [Line Items]
Outstanding common stock purchased (as a percent)													100.00%
Number of locations | location													5
Fiscal 2024 Acquisitions
Business Acquisition [Line Items]
Fair value of consideration transferred										$ 380,000
Goodwill not expected to be deductible for U.S. federal income tax purposes					17,200					17,200
Goodwill expected to be deductible for U.S. federal income tax purposes					138,200					138,200
Trade accounts and notes receivable					37,509					37,509							$ 37,355
Trade accounts and notes receivable, gross					$ 38,000					$ 38,000
Fiscal 2024 Acquisitions | Customer relationships
Business Acquisition [Line Items]
Estimated useful life (in years)										12 years 1 month 6 days
Fiscal 2024 Acquisitions | Trade names
Business Acquisition [Line Items]
Estimated useful life (in years)										15 years
Fiscal 2024 Acquisitions | Non-compete agreements
Business Acquisition [Line Items]
Estimated useful life (in years)										5 years
Jawl Lumber Corporation
Business Acquisition [Line Items]
Outstanding common stock purchased (as a percent)																		100.00%
Kamco
Business Acquisition [Line Items]
Number of distribution facilities | facility																	5
Fiscal 2023 Acquisitions
Business Acquisition [Line Items]
Fair value of consideration transferred											60,500
Goodwill not expected to be deductible for U.S. federal income tax purposes											4,500
Goodwill expected to be deductible for U.S. federal income tax purposes											5,400
Trade accounts and notes receivable											19,308								$ 20,267
Trade accounts and notes receivable, gross											$ 21,000
Fiscal 2023 Acquisitions | Customer relationships
Business Acquisition [Line Items]
Estimated useful life (in years)											9 years 6 months
Fiscal 2023 Acquisitions | Trade names
Business Acquisition [Line Items]
Estimated useful life (in years)											15 years
Engler, Meier and Justus Inc.
Business Acquisition [Line Items]
Outstanding common stock purchased (as a percent)																			100.00%