Property, Plant, and Equipment (Tables)

12 Months Ended

Sep. 30, 2018

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Estimated useful lives for major classes of depreciable assets are as follows:

Asset Class	Estimated Useful Life
Machinery and equipment	3 to 20 years
Buildings and improvements	10 to 40 years

Property, plant, and equipment consists of the following:

	September 30, 2018			September 30, 2017
Machinery and equipment	$	399,619		$	338,056
Land and buildings	76,459			84,282
Construction in process	60,803			24,788
	536,881			447,126
Less: accumulated depreciation	(216,858		)	(167,083		)
	$	320,023		$	280,043

Depreciation expense and maintenance and repairs expense for the years ended September 30, 2018, 2017 and 2016 were as follows:

	Year Ended September 30,
	2018		2017		2016
Depreciation expense	$	59,017	$	53,327	$	51,104
Maintenance and repair expense	23,343		21,392		22,504