Property, Plant and Equipment, net and Intangibles, net (Tables)

12 Months Ended

Dec. 29, 2018

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 29, 2018 and December 30, 2017: 

	2018			2017
Land (mineral bearing) and asset retirement costs	$	323,553		$	274,083
Land (non-mineral bearing)	184,029			168,501
Buildings and improvements	173,559			170,615
Plants, machinery and equipment	1,239,793			1,068,007
Mobile equipment and barges	468,313			391,256
Truck and auto fleet	51,938			47,270
Landfill airspace and improvements	49,754			49,480
Office equipment	39,794			33,314
Construction in progress	43,650			44,739
Property, plant and equipment	2,574,383			2,247,265
Less accumulated depreciation, depletion and amortization	(794,251		)	(631,841		)
Property, plant and equipment, net	$	1,780,132		$	1,615,424

Intangible Assets by Type and in Total

The following table shows intangible assets by type and in total:

	December 29, 2018							December 30, 2017
	Gross					Net		Gross					Net
	Carrying		Accumulated			Carrying		Carrying		Accumulated			Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Leases	$	19,064	$	(5,259	)	$	13,805	$	15,888	$	(4,178	)	$	11,710
Reserve rights	6,234		(1,940		)	4,294		6,234		(1,625		)	4,609
Trade names	1,000		(858		)	142		1,000		(758		)	242
Other	409		(190		)	219		409		(137		)	272
Total intangible assets	$	26,707	$	(8,247	)	$	18,460	$	23,531	$	(6,698	)	$	16,833

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:

2019	$	1,588
2020	1,510
2021	1,475
2022	1,482
2023	1,349
Thereafter	11,056
Total	$	18,460

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 December 29, 2018 and December 30, 2017:

	2018			2017
Land (mineral bearing) and asset retirement costs	$	323,553		$	274,083
Land (non-mineral bearing)	184,029			168,501
Buildings and improvements	173,559			170,615
Plants, machinery and equipment	1,239,793			1,068,007
Mobile equipment and barges	468,313			391,256
Truck and auto fleet	51,938			47,270
Landfill airspace and improvements	49,754			49,480
Office equipment	39,794			33,314
Construction in progress	43,650			44,739
Property, plant and equipment	2,574,383			2,247,265
Less accumulated depreciation, depletion and amortization	(794,251		)	(631,841		)
Property, plant and equipment, net	$	1,780,132		$	1,615,424

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

Intangible Assets by Type and in Total

The intangible assets are amortized on a straight-line basis over the lives of the leases. The following table shows intangible assets by type and in total:

	December 29, 2018							December 30, 2017
	Gross					Net		Gross					Net
	Carrying		Accumulated			Carrying		Carrying		Accumulated			Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Leases	$	19,064	$	(5,259	)	$	13,805	$	15,888	$	(4,178	)	$	11,710
Reserve rights	6,234		(1,940		)	4,294		6,234		(1,625		)	4,609
Trade names	1,000		(858		)	142		1,000		(758		)	242
Other	409		(190		)	219		409		(137		)	272
Total intangible assets	$	26,707	$	(8,247	)	$	18,460	$	23,531	$	(6,698	)	$	16,833

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:

2019	$	1,588
2020	1,510
2021	1,475
2022	1,482
2023	1,349
Thereafter	11,056
Total	$	18,460