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Fair Value of Financial Instruments - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jan. 01, 2022
Jan. 02, 2021
Financial Instruments    
Current portion of debt $ 6,354 $ 6,354
Summit Materials, LLC    
Financial Instruments    
Current portion of debt 6,354 6,354
Level 1 | Fair Value    
Financial Instruments    
Long-term debt 1,653,085 1,971,087
Current portion of debt 6,400 6,400
Level 1 | Carrying Value    
Financial Instruments    
Long-term debt 1,609,298 1,915,425
Level 1 | Summit Materials, LLC    
Financial Instruments    
Current portion of debt 6,400 6,400
Level 1 | Summit Materials, LLC | Fair Value    
Financial Instruments    
Long-term debt 1,653,085 1,971,087
Level 1 | Summit Materials, LLC | Carrying Value    
Financial Instruments    
Long-term debt 1,609,298 1,915,425
Level 3 | Fair Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 12,981 9,611
Long term portion of deferred consideration and noncompete obligations 32,130 11,037
Level 3 | Carrying Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 12,981 9,611
Long term portion of deferred consideration and noncompete obligations 32,130 11,037
Level 3 | Summit Materials, LLC | Fair Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 12,981 7,173
Long term portion of deferred consideration and noncompete obligations 32,130 11,037
Level 3 | Summit Materials, LLC | Carrying Value    
Financial Instruments    
Current portion of deferred consideration and noncompete obligations 12,981 7,173
Long term portion of deferred consideration and noncompete obligations $ 32,130 $ 11,037