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Property, Plant and Equipment, net and Intangibles, net (Tables)
12 Months Ended
Jan. 02, 2021
Property, Plant and Equipment [Line Items]  
Summary of Property, Plant and Equipment
Property, plant and equipment, net consisted of the following as of January 2, 2021 and December 28, 2019: 
 20202019
Mineral bearing land and leased interests$468,966 $333,024 
Land (non-mineral bearing)197,432 182,065 
Buildings and improvements181,198 178,088 
Plants, machinery and equipment1,397,410 1,318,512 
Mobile equipment and barges543,133 501,809 
Truck and auto fleet56,163 54,838 
Landfill airspace and improvements52,202 49,766 
Office equipment45,942 43,155 
Construction in progress40,648 42,007 
Property, plant and equipment2,983,094 2,703,264 
Less accumulated depreciation, depletion and amortization(1,132,925)(955,815)
Property, plant and equipment, net$1,850,169 $1,747,449 
The estimated useful lives are generally as follows:
   
Buildings and improvements
10 - 30
years
Plant, machinery and equipment
7 - 20
years
Office equipment
3 - 7
years
Truck and auto fleet
5 - 8
years
Mobile equipment and barges
6 - 8
years
Landfill airspace and improvements
10 - 30
years
Other
4 - 20
years
Intangible Assets by Type and in Total The following table shows intangible assets by type and in total: 
 January 2, 2021December 28, 2019
 Gross NetGross Net
 CarryingAccumulatedCarryingCarryingAccumulatedCarrying
 AmountAmortizationAmountAmountAmortizationAmount
Operating permits$33,671 $(1,207)$32,464 $6,609 $(290)$6,319 
Mineral leases19,225 (7,571)11,654 19,064 (6,408)12,656 
Reserve rights6,234 (2,504)3,730 6,234 (2,248)3,986 
Trade names— — — 1,000 (958)42 
Other586 (582)957 (462)495 
Total intangible assets$59,716 $(11,864)$47,852 $33,864 $(10,366)$23,498 
Estimated Amortization Expense for Intangible Assets The estimated amortization expense for intangible assets for each of the next five years and thereafter is as follows: 
  
2021$3,129 
20223,136 
20233,003 
20242,908 
20252,863 
Thereafter32,813 
Total$47,852 
Summit Materials, LLC  
Property, Plant and Equipment [Line Items]  
Summary of Property, Plant and Equipment
Property, plant and equipment, net consisted of the following as of January 2, 2021 and December 28, 2019:
 
 20202019
Mineral bearing land and leased interests$468,966 $333,024 
Land (non-mineral bearing)197,432 182,065 
Buildings and improvements181,198 178,088 
Plants, machinery and equipment1,397,410 1,318,512 
Mobile equipment and barges543,133 501,809 
Truck and auto fleet56,163 54,838 
Landfill airspace and improvements52,202 49,766 
Office equipment45,942 43,155 
Construction in progress40,648 42,007 
Property, plant and equipment2,983,094 2,703,264 
Less accumulated depreciation, depletion and amortization(1,132,925)(955,815)
Property, plant and equipment, net$1,850,169 $1,747,449 
The estimated useful lives are generally as follows:
 
Buildings and improvements
10 - 30 years
Plant, machinery and equipment
7 - 20 years
Office equipment
3 - 7 years
Truck and auto fleet
5 - 8 years
Mobile equipment and barges
6 - 8 years
Landfill airspace and improvements
10 - 30 years
Other
4 - 20 years
Intangible Assets by Type and in Total :
 
 January 2, 2021December 28, 2019
 Gross NetGross Net
 CarryingAccumulatedCarryingCarryingAccumulatedCarrying
 AmountAmortizationAmountAmountAmortizationAmount
Operating permits$33,671 $(1,207)$32,464 $6,609 $(290)$6,319 
Mineral leases19,225 (7,571)11,654 19,064 (6,408)12,656 
Reserve rights6,234 (2,504)3,730 6,234 (2,248)3,986 
Trade names— — — 1,000 (958)42 
Other586 (582)957 (462)495 
Total intangible assets$59,716 $(11,864)$47,852 $33,864 $(10,366)$23,498 
Estimated Amortization Expense for Intangible Assets The estimated amortization expense for intangible assets for each of the next five years and thereafter is as follows: 
2021$3,129 
20223,136 
20233,003 
20242,908 
20252,863 
Thereafter32,813 
Total$47,852