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Unaudited Consolidated Statements of Changes in Stockholders' Equity / Members' Interest - USD ($)
$ in Thousands
Total
Summit Materials, LLC
Common Class A
Common Class B
Members' equity
Summit Materials, LLC
Accumulated Earnings (Deficit)
Accumulated Earnings (Deficit)
Summit Materials, LLC
Accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss)
Summit Materials, LLC
Common Stock
Common Class A
Common Stock
Common Class B
Additional Paid-in Capital
Noncontrolling Interest In Summit Holdings
Beginning balance at Dec. 28, 2019 $ 1,444,773         $ 188,805   $ 3,448 $ (20,971) $ 1,134 $ 0 $ 1,234,020 $ 17,366
Beginning balance at Dec. 28, 2019   $ 1,513,150     $ 1,432,718   $ 101,403   (20,971)        
Beginning balance (in shares) at Dec. 28, 2019     113,309,385             113,309,385 99    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Net contributed capital   310     310                
Net (loss) income (46,726) (63,625)       (44,979) (63,625)           (1,747)
LP Unit exchanges (in shares)                   196,542      
LP Unit exchanges 0                 $ 2   1,132 (1,134)
Other comprehensive (loss) income, net of tax (6,313) (8,359)           (6,093) (8,359)       (220)
Distributions   (2,500)     (2,500)                
Stock option exercises (in shares)                   13,335      
Stock option exercises 310                 $ 0   310  
Share-based compensation 4,905 4,905     4,905             4,905  
Shares redeemed to settle taxes and other (in shares)                   591,335      
Shares redeemed to settle taxes and other (1,090) (908)     (908)         $ 6   (1,096)  
Ending balance at Mar. 28, 2020 1,395,859         143,826   (2,645)   $ 1,142 $ 0 1,239,271 14,265
Ending balance at Mar. 28, 2020   1,442,973     1,434,525   37,778   (29,330)        
Ending balance (in shares) at Mar. 28, 2020                   114,110,597 99    
Beginning balance at Dec. 28, 2019 1,444,773         188,805   3,448 (20,971) $ 1,134 $ 0 1,234,020 17,366
Beginning balance at Dec. 28, 2019   1,513,150     1,432,718   101,403   (20,971)        
Beginning balance (in shares) at Dec. 28, 2019     113,309,385             113,309,385 99    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Net (loss) income 12,161 6,392                      
LP Unit exchanges (in shares)     196,542                    
Other comprehensive (loss) income, net of tax (4,088)                        
Stock option exercises (in shares)     13,335                    
Shares redeemed to settle taxes and other (in shares)     592,686                    
Ending balance at Jun. 27, 2020 1,461,863         200,890   (497) (26,384) $ 1,142 $ 0 1,244,163 16,165
Ending balance at Jun. 27, 2020   1,520,828     1,439,417   107,795   (26,384)        
Ending balance (in shares) at Jun. 27, 2020     114,111,948             114,111,948 99    
Beginning balance at Mar. 28, 2020 1,395,859         143,826   (2,645)   $ 1,142 $ 0 1,239,271 14,265
Beginning balance at Mar. 28, 2020   1,442,973     1,434,525   37,778   (29,330)        
Beginning balance (in shares) at Mar. 28, 2020                   114,110,597 99    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Net (loss) income 58,887 70,017       57,064 70,017           1,823
Other comprehensive (loss) income, net of tax 2,225 2,946           2,148 2,946       77
Share-based compensation 4,892 4,892     4,892             4,892  
Shares redeemed to settle taxes and other (in shares)                   1,351      
Shares redeemed to settle taxes and other 0                 $ 0   0 0
Ending balance at Jun. 27, 2020 1,461,863         200,890   (497) (26,384) $ 1,142 $ 0 1,244,163 16,165
Ending balance at Jun. 27, 2020   1,520,828     1,439,417   107,795   (26,384)        
Ending balance (in shares) at Jun. 27, 2020     114,111,948             114,111,948 99    
Beginning balance at Jan. 02, 2021 1,616,268         326,772   5,203 (18,583) $ 1,145 $ 0 1,264,681 18,467
Beginning balance at Jan. 02, 2021   1,662,768     1,459,211   222,140   (18,583)        
Beginning balance (in shares) at Jan. 02, 2021     114,390,595 99           114,390,595 99    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Net contributed capital   15,920     15,920                
Net (loss) income (23,245) (27,790)       (22,517) (27,790)           (728)
LP Unit exchanges (in shares)                   711,794      
LP Unit exchanges 0                 $ 7   4,744 (4,751)
Other comprehensive (loss) income, net of tax 1,680 2,126           1,635 2,126       45
Distributions   (2,500)     (2,500)                
Stock option exercises (in shares)                   863,338      
Stock option exercises 15,920                 $ 9   15,911  
Share-based compensation 5,363 5,363     5,363             5,363  
Shares redeemed to settle taxes and other (in shares)                   678,605      
Shares redeemed to settle taxes and other (1,426) (416)     (416)         $ 6   (1,432)  
Ending balance at Apr. 03, 2021 1,614,560         304,255   6,838   $ 1,167 $ 0 1,289,267 13,033
Ending balance at Apr. 03, 2021   1,655,471     1,477,578   194,350   (16,457)        
Ending balance (in shares) at Apr. 03, 2021                   116,644,332 99    
Beginning balance at Jan. 02, 2021 1,616,268         326,772   5,203 (18,583) $ 1,145 $ 0 1,264,681 18,467
Beginning balance at Jan. 02, 2021   1,662,768     1,459,211   222,140   (18,583)        
Beginning balance (in shares) at Jan. 02, 2021     114,390,595 99           114,390,595 99    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Net (loss) income 34,513 42,025                      
LP Unit exchanges (in shares)     1,157,334                    
Other comprehensive (loss) income, net of tax 3,759                        
Stock option exercises (in shares)     1,710,818                    
Shares redeemed to settle taxes and other (in shares)     697,141                    
Ending balance at Jul. 03, 2021 1,694,922         360,914   8,866 (13,825) $ 1,180 $ 0 1,313,414 10,548
Ending balance at Jul. 03, 2021   1,748,591     1,498,251   264,165   (13,825)        
Ending balance (in shares) at Jul. 03, 2021     117,955,888 99           117,955,888 99    
Beginning balance at Apr. 03, 2021 1,614,560         304,255   6,838   $ 1,167 $ 0 1,289,267 13,033
Beginning balance at Apr. 03, 2021   1,655,471     1,477,578   194,350   (16,457)        
Beginning balance (in shares) at Apr. 03, 2021                   116,644,332 99    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Net contributed capital   15,846     15,846                
Net (loss) income 57,758 69,815       56,659 69,815           1,099
LP Unit exchanges (in shares)                   445,540      
LP Unit exchanges 0                 $ 4   3,631 (3,635)
Other comprehensive (loss) income, net of tax 2,079 2,632           2,028 2,632       51
Stock option exercises (in shares)                   847,480      
Stock option exercises 15,845                 $ 8   15,837  
Share-based compensation 4,827 4,827     4,827             4,827  
Shares redeemed to settle taxes and other (in shares)                   18,536      
Shares redeemed to settle taxes and other (147)                 $ 1   (148)  
Ending balance at Jul. 03, 2021 $ 1,694,922         $ 360,914   $ 8,866 (13,825) $ 1,180 $ 0 $ 1,313,414 $ 10,548
Ending balance at Jul. 03, 2021   $ 1,748,591     $ 1,498,251   $ 264,165   $ (13,825)        
Ending balance (in shares) at Jul. 03, 2021     117,955,888 99           117,955,888 99