Detail of Selected Balance Sheet Accounts (Tables)

12 Months Ended

Sep. 30, 2020

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,
	2020		2019
Balance at beginning of period	$	301	$	157
Bad debt expense	258		233
Uncollectible accounts written off, net of recoveries	(32)		(81)
Change due to foreign currency translation	(17)		(8)
Balance at end of period	$	510	$	301

Components of Inventories

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

	September 30,
	2020		2019
Raw materials, parts and subassemblies	$	31,202	$	31,781
Work-in-progress	1,539		1,100
Provision for excess and obsolete inventory	(3,773)		(3,679)
Total inventories	$	28,968	$	29,202

Schedule of Property, Plant and Equipment

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

	September 30,				Range of
	2020		2019		Asset Lives
Land	$	22,008	$	21,963	—
Buildings and improvements	122,529		122,404		3 - 39 Years
Machinery and equipment	108,439		106,137		3 - 15 Years
Furniture and fixtures	3,611		3,611		3 - 10 Years
Construction in process	1,530		2,118		—
	$	258,117	$	256,233
Less: Accumulated depreciation	(143,745)		(135,421)
Total property, plant and equipment, net	$	114,372	$	120,812

Activity in Warranty Accrual

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

	September 30,
	2020		2019
Balance at beginning of period	$	2,946	$	2,604
Increase to warranty expense	2,286		3,004
Deduction for warranty charges	(2,463)		(2,649)
Change due to foreign currency translation	2		(13)
Balance at end of period	$	2,771	$	2,946