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SUMMARY OF ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Business and Credit Concentration (Details)
6 Months Ended
Jun. 29, 2019
state
Summit Materials, LLC  
Business and Credit Concentrations  
Number of states in which the entity operates 23
Tax Receivable Agreement | Summit Holdings LP  
Business and Credit Concentrations  
Percentage of benefits to be paid on tax receivable agreement 85.00%
Percentage of the tax receivable agreement allocated to additional paid-in capital 15.00%