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Property, Plant and Equipment, net and Intangibles, net (Tables)
 12 Months Ended
Dec. 28, 2019
Property, Plant and Equipment [Line Items]  
Summary of Property, Plant and Equipment The estimated useful lives are generally as follows:
 
 
 
Buildings and improvements
10 - 30
years
Plant, machinery and equipment
15 - 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

Property, plant and equipment, net consisted of the following as of December 28, 2019 and December 29, 2018: 
 
 
2019
 
2018
Land (mineral bearing) and asset retirement costs
 
$
333,024

 
$
323,553

Land (non-mineral bearing)
 
182,065

 
184,029

Buildings and improvements
 
178,088

 
173,559

Plants, machinery and equipment
 
1,318,512

 
1,239,793

Mobile equipment and barges
 
501,809

 
468,313

Truck and auto fleet
 
54,838

 
51,938

Landfill airspace and improvements
 
49,766

 
49,754

Office equipment
 
43,155

 
39,794

Construction in progress
 
42,007

 
43,650

Property, plant and equipment
 
2,703,264

 
2,574,383

Less accumulated depreciation, depletion and amortization
 
(955,815
)
 
(794,251
)
Property, plant and equipment, net
 
$
1,747,449

 
$
1,780,132
Intangible Assets by Type and in Total The following table shows intangible assets by type and in total: 
 
 
December 28, 2019
 
December 29, 2018
 
 
Gross
 
 
 
Net
 
Gross
 
 
 
Net
 
 
Carrying
 
Accumulated
 
Carrying
 
Carrying
 
Accumulated
 
Carrying
 
 
Amount
 
Amortization
 
Amount
 
Amount
 
Amortization
 
Amount
Mineral leases
 
$
19,064

 
$
(6,408
)
 
$
12,656

 
$
19,064

 
$
(5,259
)
 
$
13,805

Reserve rights
 
6,234

 
(2,248
)
 
3,986

 
6,234

 
(1,940
)
 
4,294

Trade names
 
1,000

 
(958
)
 
42

 
1,000

 
(858
)
 
142

Other
 
7,566

 
(752
)
 
6,814

 
409

 
(190
)
 
219

Total intangible assets
 
$
33,864

 
$
(10,366
)
 
$
23,498

 
$
26,707

 
$
(8,247
)
 
$
18,460
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:
 
 
 
2020
$
2,526

2021
2,138

2022
2,142

2023
2,009

2024
1,914

Thereafter
12,769

Total
$
23,498
Summit Materials, LLC  
Property, Plant and Equipment [Line Items]  
Summary of Property, Plant and Equipment The estimated useful lives are generally as follows:
 
Buildings and improvements
10-30 years
Plant, machinery and equipment
15 - 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


Property, plant and equipment, net consisted of the following as of December 28, 2019 and December 29, 2018:
 
 
 
2019
 
2018
Land (mineral bearing) and asset retirement costs
 
$
333,024

 
$
323,553

Land (non-mineral bearing)
 
182,065

 
184,029

Buildings and improvements
 
178,088

 
173,559

Plants, machinery and equipment
 
1,318,512

 
1,239,793

Mobile equipment and barges
 
501,809

 
468,313

Truck and auto fleet
 
54,838

 
51,938

Landfill airspace and improvements
 
49,766

 
49,754

Office equipment
 
43,155

 
39,794

Construction in progress
 
42,007

 
43,650

Property, plant and equipment
 
2,703,264

 
2,574,383

Less accumulated depreciation, depletion and amortization
 
(955,815
)
 
(794,251
)
Property, plant and equipment, net
 
$
1,747,449

 
$
1,780,132
Intangible Assets by Type and in Total The following table shows intangible assets by type and in total:
 
 
 
December 28, 2019
 
December 29, 2018
 
 
Gross
 
 
 
Net
 
Gross
 
 
 
Net
 
 
Carrying
 
Accumulated
 
Carrying
 
Carrying
 
Accumulated
 
Carrying
 
 
Amount
 
Amortization
 
Amount
 
Amount
 
Amortization
 
Amount
Mineral leases
 
$
19,064

 
$
(6,408
)
 
$
12,656

 
$
19,064

 
$
(5,259
)
 
$
13,805

Reserve rights
 
6,234

 
(2,248
)
 
3,986

 
6,234

 
(1,940
)
 
4,294

Trade names
 
1,000

 
(958
)
 
42

 
1,000

 
(858
)
 
142

Other
 
7,566

 
(752
)
 
6,814

 
409

 
(190
)
 
219

Total intangible assets
 
$
33,864

 
$
(10,366
)
 
$
23,498

 
$
26,707

 
$
(8,247
)
 
$
18,460
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:
 
2020
$
2,526

2021
2,138

2022
2,142

2023
2,009

2024
1,914

Thereafter
12,769

Total
$
23,498