ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Acquisitions by Region (Details)	3 Months Ended	12 Months Ended
	Mar. 30, 2024 acquisition Segment	Dec. 30, 2023 acquisition
Argos USA
Business Acquisition [Line Items]
Number of segments affected by acquisition | Segment	3
Summit Materials, LLC | Argos USA
Business Acquisition [Line Items]
Number of segments affected by acquisition | Segment	3
West
Business Acquisition [Line Items]
Number of businesses acquired	1	3
Number of aggregate-based operations acquired	1
West | Summit Materials, LLC
Business Acquisition [Line Items]
Number of businesses acquired	1	3
Number of aggregate-based operations acquired	1
East
Business Acquisition [Line Items]
Number of businesses acquired	0	1
East | Summit Materials, LLC
Business Acquisition [Line Items]
Number of businesses acquired	0	1
Cement
Business Acquisition [Line Items]
Number of businesses acquired	0	0
Cement | Summit Materials, LLC
Business Acquisition [Line Items]
Number of businesses acquired	0	0