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Accrued Mining and Landfill Reclamation (Tables)
 12 Months Ended
Dec. 28, 2019
Asset Retirement Obligations [Line Items]  
Activity for Asset Retirement Obligations The following table presents the activity for the asset retirement obligations for the years ended December 28, 2019 and December 29, 2018: 
 
 
2019
 
2018
Beginning balance
 
$
30,999

 
$
24,329

Acquired obligations
 
805

 
3,937

Change in cost estimate
 
4,468

 
2,808

Settlement of reclamation obligations
 
(1,812
)
 
(1,680
)
Accretion expense
 
2,216

 
1,605

Ending balance
 
$
36,676

 
$
30,999
Summit Materials, LLC  
Asset Retirement Obligations [Line Items]  
Activity for Asset Retirement Obligations The following table presents the activity for the asset retirement obligations for the years ended December 28, 2019 and December 29, 2018:
 
 
2019
 
2018
Beginning balance
 
$
30,999

 
$
24,329

Acquired obligations
 
805

 
3,937

Change in cost estimate
 
4,468

 
2,808

Settlement of reclamation obligations
 
(1,812
)
 
(1,680
)
Accretion expense
 
2,216

 
1,605

Ending balance
 
$
36,676

 
$
30,999