Business Combinations - Narrative (Details) $ in Thousands			3 Months Ended								12 Months Ended
	Dec. 01, 2021 USD ($) location	Jul. 01, 2021 USD ($) location	Apr. 30, 2024 USD ($)	Jan. 31, 2024 USD ($)	Oct. 31, 2023 USD ($)	Jul. 31, 2023 USD ($)	Apr. 30, 2023 USD ($)	Jan. 31, 2023 USD ($)	Oct. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)	Apr. 30, 2024 USD ($) location	Apr. 30, 2023 USD ($)	Apr. 30, 2022 USD ($)	Mar. 01, 2024 USD ($) facility	May 01, 2023	Apr. 03, 2023 USD ($)
Business Acquisition [Line Items]
Net sales			$ 1,413,029	$ 1,258,348	$ 1,420,930	$ 1,409,600	$ 1,304,102	$ 1,234,618	$ 1,430,979	$ 1,359,553	$ 5,501,907	$ 5,329,252	$ 4,634,875
Net income			56,387	$ 51,905	$ 80,957	$ 86,830	75,593	$ 64,775	$ 103,153	$ 89,470	276,079	332,991	273,442
Transaction costs											$ 4,856	$ 1,961	3,545
Estimated useful life (in years)											13 years 1 month 6 days	12 years 9 months 18 days
Number of retail locations | location											100
Customer relationships
Business Acquisition [Line Items]
Estimated useful life (in years)											12 years 9 months 18 days	12 years 4 months 24 days
Trade names
Business Acquisition [Line Items]
Estimated useful life (in years)											15 years 4 months 24 days	15 years 7 months 6 days
Fiscal 2024 Acquisitions
Business Acquisition [Line Items]
Net sales											$ 71,500
Net income											(5,400)
Consideration											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]
Consideration												$ 60,500
Goodwill not expected to be deductible for U.S. federal income tax purposes							4,500					4,500
Goodwill expected to be deductible for U.S. federal income tax purposes							5,400					5,400
Trade accounts and notes receivable							19,308					19,308				$ 20,267
Trade accounts and notes receivable, gross							$ 21,000					$ 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%
Westside Building Material
Business Acquisition [Line Items]
Consideration		$ 140,100
Trade accounts and notes receivable		$ 27,081											26,282
Trade accounts and notes receivable, gross													26,400
Number of distribution network locations | location		10
Holdback liability		$ 13,500
Liability related to general representations and warranties, settlement period (in months)		15 months
Westside Building Material | California
Business Acquisition [Line Items]
Number of distribution network locations | location		9
Westside Building Material | Nevada
Business Acquisition [Line Items]
Number of distribution network locations | location		1
Westside Building Material | Customer relationships
Business Acquisition [Line Items]
Estimated useful life (in years)		9 years 6 months
Westside Building Material | Trade names
Business Acquisition [Line Items]
Estimated useful life (in years)		15 years
Ames Taping Tools Holding LLC
Business Acquisition [Line Items]
Trade accounts and notes receivable	$ 9,955												9,901
Trade accounts and notes receivable, gross													$ 11,600
Cash consideration	$ 226,700
Number of retail locations | location	100
Ames Taping Tools Holding LLC | Trade names
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired	$ 23,000
Ames Taping Tools Holding LLC | Customer relationships
Business Acquisition [Line Items]
Estimated useful life (in years)	11 years
Ames Taping Tools Holding LLC | Trade names
Business Acquisition [Line Items]
Estimated useful life (in years)	15 years
Finite-lived intangible assets acquired	$ 26,000
Ames Taping Tools Holding LLC | Patents
Business Acquisition [Line Items]
Estimated useful life (in years)	10 years