Property, Plant and Equipment (Tables)

12 Months Ended

Sep. 30, 2019

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment

The useful lives of property, plant and equipment categories are as follows:

Category	Estimated Useful Life
Land and improvements	Land, unlimited; improvements, 15-25 years
Quarry reserves	Based on depletion
Buildings	5 - 39 years
Plants	3 - 20 years
Construction equipment	3 - 10 years
Furniture and fixtures	5 - 10 years
Leasehold improvements	The shorter of 15 years or the remaining lease term

Property, plant and equipment at September 30, 2019 and 2018 consisted of the following (in thousands):

	September 30,
	2019		2018
Construction equipment	$	214,500	$	190,420
Plants	92,279		79,563
Land and improvements	34,365		29,624
Quarry reserves	20,678		20,908
Buildings	15,458		12,416
Furniture and fixtures	4,864		4,422
Leasehold improvements	1,135		765
Total property, plant and equipment, gross	383,279		338,118
Accumulated depreciation, depletion and amortization	(177,927)		(160,795)
Construction in progress	518		1,369
Total property, plant and equipment, net	$	205,870	$	178,692