Property and Equipment, net

9 Months Ended

Jun. 30, 2018

Property Plant And Equipment [Abstract]

5.Property and Equipment, net

Property and equipment, net consists of the following:

	Useful Life	June 30, 2018		September 30, 2017
Land	—	$	51,310	$	37,225
Buildings and leasehold improvements	2-40 yrs.		35,577		27,652
Operating equipment	3-7 yrs.		184,102		182,720
Transportation vehicles	3-7 yrs.		197,687		174,434
Office equipment and software	3-7 yrs.		60,554		47,042
Construction in progress	—		5,414		4,639
Property and equipment			534,644		473,712
Less: Accumulated depreciation			274,108		228,178
Property and equipment, net		$	260,536	$	245,534

Construction in progress includes costs incurred for software and other assets that have not yet been placed in service. Depreciation expense related to property and equipment was $17,839, $19,919, $56,642 and $60,740 for the three months ended June 30, 2018 and 2017 and the nine months ended June 30, 2018 and 2017, respectively.