v3.22.2.2
Cover Document
Dec. 05, 2022
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Dec. 05, 2022
Entity Registrant Name Summit Materials, Inc.
Entity Incorporation, State or Country Code DE
Entity File Number 001-36873
Entity Tax Identification Number 47-1984212
Entity Address, Address Line One 1801 California Street
Entity Address, Address Line Two Suite 3500
Entity Address, City or Town Denver
Entity Address, State or Province CO
Entity Address, Postal Zip Code 80202
City Area Code 303
Local Phone Number 893-0012
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Class A Common Stock (par value, $0.01 per share)
Trading Symbol SUM
Security Exchange Name NYSE
Entity Emerging Growth Company false
Entity Central Index Key 0001621563
Amendment Flag false
Summit Materials, LLC  
Document Information [Line Items]  
Entity Registrant Name Summit Materials, LLC
Entity Incorporation, State or Country Code DE
Entity File Number 333-187556
Entity Tax Identification Number 24-4138486
Entity Central Index Key 0001571371