Inventories (Tables)

12 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

Schedule of Inventory

The major classes of inventory, net are as follows:

	September 30, 2019			September 30, 2018
Raw materials and supplies	$	75,223		$	69,176
Work in progress	14,741			19,461
Finished goods and products held for resale	58,223			53,786
Costs of unbilled projects	2,347			1,878
Reserves for excess and obsolete	(13,370		)	(9,313		)
Inventories, net	$	137,164		$	134,988

Schedule of Activity in Reserves for Excess and Obsolete Inventory

The following is the activity in the reserves for excess and obsolete inventory:

	Year Ended September 30,
	2019			2018			2017
Balance at beginning of period	$	(9,313	)	$	(10,599	)	$	(10,141	)
Additions charged to expense	(5,754		)	(419		)	(1,004		)
Write-offs	1,541			104			947
Foreign currency and other	156			1,601			(401		)
Balance at end of period	$	(13,370	)	$	(9,313	)	$	(10,599	)