Business Combinations - Narrative (Details) $ in Thousands, $ in Millions					3 Months Ended								12 Months Ended
	Dec. 01, 2021 USD ($) location	Jul. 01, 2021 USD ($) location	Feb. 01, 2021 USD ($) location	Feb. 01, 2021 CAD ($)	Apr. 30, 2023 USD ($)	Jan. 31, 2023 USD ($)	Oct. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)	Apr. 30, 2022 USD ($)	Jan. 31, 2022 USD ($)	Oct. 31, 2021 USD ($)	Jul. 31, 2021 USD ($)	Apr. 30, 2023 USD ($) location	Apr. 30, 2022 USD ($)	Apr. 30, 2021 USD ($)
Business Acquisition [Line Items]
Net sales					$ 1,304,102	$ 1,234,618	$ 1,430,979	$ 1,359,553	$ 1,288,653	$ 1,153,595	$ 1,150,551	$ 1,042,076	$ 5,329,252	$ 4,634,875	$ 3,298,823
Net income					75,593	$ 64,775	$ 103,153	$ 89,470	76,496	$ 61,383	$ 74,361	$ 61,202	332,991	273,442	105,560
Transaction costs													$ 1,961	$ 3,545	1,068
Estimated useful life (in years)													12 years 9 months 18 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 4 months 24 days	12 years 6 months
Tradenames
Business Acquisition [Line Items]
Estimated useful life (in years)													15 years 7 months 6 days	15 years 7 months 6 days
Fiscal 2023 Acquisitions
Business Acquisition [Line Items]
Net sales													$ 23,300
Net income													4,100
Fair value of consideration transferred					61,732								61,732
Goodwill expected to be deductible for U.S. federal income tax purposes					7,000								7,000
Goodwill not expected to be deductible for U.S. federal income tax purposes					3,700								3,700
Trade accounts and notes receivable					20,267								20,267
Trade accounts and notes receivable, gross					$ 22,000								$ 22,000
Fiscal 2023 Acquisitions | Customer relationships
Business Acquisition [Line Items]
Estimated useful life (in years)													9 years 6 months
Fiscal 2023 Acquisitions | Tradenames
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%								100.00%
Westside Building Material
Business Acquisition [Line Items]
Fair value of consideration transferred		$ 139,635							140,108					$ 140,108
Trade accounts and notes receivable		27,081							26,282					26,282
Trade accounts and notes receivable, gross									26,400					26,400
Preliminary consideration transferred		$ 140,100
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 | Tradenames
Business Acquisition [Line Items]
Estimated useful life (in years)		15 years
Ames Taping Tools Holding LLC
Business Acquisition [Line Items]
Fair value of consideration transferred	$ 224,507								226,670					226,670
Trade accounts and notes receivable	9,955								9,901					9,901
Trade accounts and notes receivable, gross									$ 11,600					$ 11,600
Cash consideration	$ 226,700
Number of retail locations | location	100
Ames Taping Tools Holding LLC | Tradenames
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 | Tradenames
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
D.L. Building Materials Inc.
Business Acquisition [Line Items]
Fair value of consideration transferred			$ 39,474												38,921
Outstanding common stock purchased (as a percent)			100.00%
Trade accounts and notes receivable			$ 8,325												$ 8,301
Preliminary consideration transferred			$ 38,900	$ 49.9
Number of locations | location			2