Other Balance Sheet Information (Tables)

9 Months Ended

Jun. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Accounts Receivable

The following is a summary of accounts receivable at June 30, 2019 and September 30, 2018 (in thousands):

	June 30,		September 30,
	2019		2018
Accounts receivable	$	166,038	$	126,350
Less allowance for doubtful accounts		(2,888)		(1,113)
Less allowance for sales returns		(45)		(45)
Accounts receivable, net	$	163,105	$	125,192

Summary of Inventories

The following is a summary of inventories at June 30, 2019 and September 30, 2018 (in thousands):

	June 30,		September 30,
	2019		2018
Inventories
Raw materials and purchased parts	$	69,070	$	57,527
Work-in-process		12,886		19,547
Finished goods		22,830		19,912
Total inventories	$	104,786	$	96,986

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 and nine months ended June 30, 2019 and 2018 (in thousands):

Activity -Three Months Ended June 30, 2019
Balance						Balance
March 31,						June 30,
2019		Accruals		Costs Incurred		2019
$	7,202	$	2,257	$	(2,269)	$	7,190

Activity -Three Months Ended June 30, 2018
Balance						Balance
March 31,						June 30,
2018		Accruals		Costs Incurred		2018
$	5,634	$	1,145	$	(702)	$	6,077

Activity -Nine Months Ended June 30, 2019
Balance						Balance
September 30,						June 30,
2018		Accruals		Costs Incurred		2019
$	6,340	$	6,419	$	(5,569)	$	7,190

Activity -Nine Months Ended June 30, 2018
Balance						Balance
September 30,						June 30,
2017		Accruals		Costs Incurred		2018
$	5,479	$	3,929	$	(3,331)	$	6,077