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Revenue Recognition
12 Months Ended
Jan. 02, 2021
Revenue from External Customer [Line Items]  
Revenue Recognition Revenue Recognition
We derive our revenue predominantly by selling construction materials, products and providing paving and related services. Construction materials consist of aggregates and cement. Products consist of related downstream products, including ready-mix concrete, asphalt paving mix and concrete products. Paving and related service revenue is generated primarily from the asphalt paving services that we provide, and is recognized based on the proportion of costs incurred to date relative to the total estimated costs at completion. The majority of our construction service contracts, and therefore revenue, are opened and completed within one year, with the most activity during the spring, summer and fall.

Revenue by product for the years ended January 2, 2021, December 28, 2019 and December 29, 2018 consisted of the following:
 202020192018
Revenue by product*:   
Aggregates$498,007 $469,670 $373,824 
Cement257,629 266,235 258,876 
Ready-mix concrete668,060 607,622 584,114 
Asphalt349,350 330,750 301,247 
Paving and related services381,430 360,234 379,540 
Other177,975 187,629 203,401 
Total revenue$2,332,451 $2,222,140 $2,101,002 
______________________
 *       Revenue from the liquid asphalt terminals is included in asphalt revenue.

The following table outlines the significant changes in contract assets and contract liability balances from December 28, 2019 to January 2, 2021. Also included in the table is the net change in the estimate as a percentage of aggregate revenue for such contracts: 
Costs and estimatedBillings in excess
earnings inof costs and
excess of billingsestimated earnings
Balance—December 28, 2019$13,088 $13,864 
Changes in revenue billed, contract price or cost estimates(4,535)2,616 
Other113 19 
Balance—January 2, 2021$8,666 $16,499 

Accounts receivable, net consisted of the following as of January 2, 2021 and December 28, 2019:
 20202019
Trade accounts receivable$191,871 $191,672 
Construction contract receivables47,179 47,966 
Retention receivables18,824 17,808 
Receivables from related parties1,339 1,596 
Accounts receivable259,213 259,042 
Less: Allowance for doubtful accounts(4,517)(5,786)
Accounts receivable, net$254,696 $253,256 
 
Retention receivables are amounts earned by the Company but held by customers until paving and related service contracts and projects are near completion or fully completed. Amounts are generally billed and collected within one year.
Summit Materials, LLC  
Revenue from External Customer [Line Items]  
Revenue Recognition Revenue Recognition
We derive our revenue predominantly by selling construction materials, products and providing paving and related services. Construction materials consist of aggregates and cement. Products consist of related downstream products, including ready-mix concrete, asphalt paving mix and concrete products. Paving and related service revenue is generated primarily from the asphalt paving services that we provide, and is recognized based on the proportion of costs incurred to date relative to the total estimated costs at completion. The majority of our construction service contracts, and therefore revenue, are opened and completed within one year, with the most activity during the spring, summer and fall.

Revenue by product for the years ended January 2, 2021, December 28, 2019 and December 29, 2018 consisted of the following:
 202020192018
Revenue by product*:
Aggregates$498,007 $469,670 $373,824 
Cement257,629 266,235 258,876 
Ready-mix concrete668,060 607,622 584,114 
Asphalt349,350 330,750 301,247 
Paving and related services381,430 360,234 379,540 
Other177,975 187,629 203,401 
Total revenue$2,332,451 $2,222,140 $2,101,002 
______________________
*Revenue from the liquid asphalt terminals is included in asphalt revenue.

The following table outlines the significant changes in contract assets and contract liability balances from December 28, 2019 to January 2, 2021. Also included in the table is the net change in the estimate as a percentage of aggregate revenue for such contracts: 
Costs and estimatedBillings in excess
earnings inof costs and
excess of billingsestimated earnings
Balance—December 28, 2019$13,088 $13,864 
Changes in revenue billed, contract price or cost estimates(4,535)2,616 
Other113 19 
Balance—January 2, 2021$8,666 $16,499 

Accounts receivable, net consisted of the following as of January 2, 2021 and December 28, 2019:
 20202019
Trade accounts receivable$191,871 $191,672 
Construction contract receivables47,179 47,966 
Retention receivables18,824 17,808 
Receivables from related parties1,339 1,596 
Accounts receivable259,213 259,042 
Less: Allowance for doubtful accounts(4,517)(5,786)
Accounts receivable, net$254,696 $253,256 
 
Retention receivables are amounts earned by the Company but held by customers until paving and related service contracts and projects are near completion or fully completed. Amounts are generally billed and collected within one year.