Other Balance Sheet Information (Tables)

3 Months Ended

Dec. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Accounts Receivable

The following is a summary of accounts receivable at December 31, 2019 and September 30, 2019 (in thousands):

	December 31,		September 30,
	2019		2019
Accounts receivable	$	168,851	$	169,317
Less allowance for doubtful accounts		(3,592)		(3,644)
Less allowance for sales returns		(83)		(71)
Accounts receivable, net	$	165,176	$	165,602

Summary of Inventories

The following is a summary of inventories at December 31, 2019 and September 30, 2019 (in thousands):

	December 31,		September 30,
	2019		2019
Inventories
Raw materials and purchased parts	$	70,694	$	67,176
Work-in-process		13,625		13,684
Finished goods		20,862		18,585
Total inventories	$	105,181	$	99,445

Product Warranty and Retrofit Activity on Gross Basis

The following is a summary of product warranty and retrofit activity on a gross basis for the three months ended December 31, 2019 and 2018 (in thousands):

Activity -Three Months Ended December 31, 2019
Balance						Balance
September 30,						December 31,
2019		Accruals		Costs Incurred		2019
$	7,175	$	2,479	$	(2,161)	$	7,493

Activity -Three Months Ended December 31, 2018
Balance						Balance
September 30,						December 31,
2018		Accruals		Costs Incurred		2018
$	6,340	$	2,355	$	(1,844)	$	6,851