Detail of Selected Balance Sheet Accounts (Tables)

12 Months Ended

Sep. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Activity in Allowance for Doubtful Accounts

Activity in our allowance for doubtful accounts consisted of the following (in thousands):

	September 30,
	2019			2018
Balance at beginning of period	$	157		$	179
Bad debt expense	233			111
Uncollectible accounts written off, net of recoveries	(81		)	(125		)
Change due to foreign currency translation	(8		)	(8		)
Balance at end of period	$	301		$	157

Components of Inventories

The components of inventories are summarized below (in thousands):

	September 30,
	2019			2018
Raw materials, parts and subassemblies	$	31,781		$	24,563
Work-in-progress	1,100			1,080
Provision for excess and obsolete inventory	(3,679		)	(4,291		)
Total inventories	$	29,202		$	21,352

Schedule of Property, Plant and Equipment

Property, plant and equipment are summarized below (in thousands):

	September 30,						Range of
	2019			2018			Asset Lives
Land	$	21,963		$	22,207		—
Buildings and improvements	122,404			123,320			3 - 39 Years
Machinery and equipment	106,137			104,542			3 - 15 Years
Furniture and fixtures	3,611			3,799			3 - 10 Years
Construction in process	2,118			357			—
	$	256,233		$	254,225
Less: Accumulated depreciation	(135,421		)	(125,461		)
Total property, plant and equipment, net	$	120,812		$	128,764

Activity in Warranty Accrual

Activity in our product warranty accrual consisted of the following (in thousands):

	September 30,
	2019			2018
Balance at beginning of period	$	2,604		$	3,174
Increase to warranty expense	3,004			2,031
Deduction for warranty charges	(2,649		)	(2,574		)
Change due to foreign currency translation	(13		)	(27		)
Balance at end of period	$	2,946		$	2,604