Business Combinations - Narrative (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Jul. 01, 2021 USD ($) location	Jul. 31, 2021	Apr. 30, 2021
Customer relationships
Business Acquisition [Line Items]
Estimated useful life (in years)		12 years 8 months 12 days	13 years 3 months 18 days
Tradenames
Business Acquisition [Line Items]
Estimated useful life (in years)		15 years 9 months 18 days	16 years 9 months 18 days
Westside Building Material
Business Acquisition [Line Items]
Preliminary consideration transferred	$ 139,635
Number of distribution network locations | location	10
Holdback liability	$ 17,000
Working capital adjustments	$ 3,500
Working capital adjustments, settlement period (in days)	150 days
Liability related to general representations and warranties	$ 13,500
Liability related to general representations and warranties, settlement period (in months)	15 months
Westside Building Material | Customer relationships
Business Acquisition [Line Items]
Estimated useful life (in years)	12 years
Westside Building Material | Tradenames
Business Acquisition [Line Items]
Estimated useful life (in years)	15 years
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