v3.22.4
Stockholders' Equity/Members' Interest - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Jan. 01, 2022
Changes in each component of accumulated other comprehensive loss    
Beginning balance stockholders' equity $ 1,823,212 $ 1,616,268
Postretirement liability adjustment, net of tax 4,848 975
Foreign currency translation adjustment, net of tax (8,847) 905
Ending balance stockholders' equity 2,011,990 1,823,212
Change in retirement plans    
Changes in each component of accumulated other comprehensive loss    
Beginning balance stockholders' equity 1,508 533
Postretirement liability adjustment, net of tax 4,848 975
Ending balance stockholders' equity 6,356 1,508
Foreign currency translation adjustment    
Changes in each component of accumulated other comprehensive loss    
Beginning balance stockholders' equity 5,575 4,670
Foreign currency translation adjustment, net of tax (8,847) 905
Ending balance stockholders' equity (3,272) 5,575
Accumulated Other Comprehensive Income (Loss)    
Changes in each component of accumulated other comprehensive loss    
Beginning balance stockholders' equity 7,083 5,203
Ending balance stockholders' equity 3,084 7,083
Summit Materials, LLC    
Changes in each component of accumulated other comprehensive loss    
Beginning balance members' interest 1,884,944 1,662,768
Postretirement liability adjustment, net of tax 6,481 1,303
Foreign currency translation adjustment, net of tax (11,831) 1,254
Ending balance members' interest 2,143,150 1,884,944
Summit Materials, LLC | Change in retirement plans    
Changes in each component of accumulated other comprehensive loss    
Beginning balance members' interest (7,243) (8,546)
Postretirement liability adjustment, net of tax 6,481 1,303
Ending balance members' interest (762) (7,243)
Summit Materials, LLC | Foreign currency translation adjustment    
Changes in each component of accumulated other comprehensive loss    
Beginning balance members' interest (8,783) (10,037)
Foreign currency translation adjustment, net of tax (11,831) 1,254
Ending balance members' interest (20,614) (8,783)
Summit Materials, LLC | Accumulated Other Comprehensive Income (Loss)    
Changes in each component of accumulated other comprehensive loss    
Beginning balance members' interest (16,026) (18,583)
Ending balance members' interest $ (21,376) $ (16,026)