Inventories (Tables)

12 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Schedule of Inventory

The major classes of inventory, net are as follows:

	September 30, 2021		September 30, 2020
Raw materials and supplies	$	86,469	$	78,319
Work in progress	19,842		15,654
Finished goods and products held for resale	59,624		56,435
Costs of unbilled projects	2,277		3,438
Reserves for excess and obsolete	(9,709)		(11,467)
Inventories, net	$	158,503	$	142,379

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,
	2021		2020		2019
Balance at beginning of period	$	(11,467)	$	(13,370)	$	(9,313)
Change to reserve requirement	265		(310)		(5,754)
Write-offs	1,516		2,197		1,541
Foreign currency and other	(23)		16		156
Balance at end of period	$	(9,709)	$	(11,467)	$	(13,370)