Other Balance Sheet Information (Tables)

9 Months Ended

Jun. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Accounts Receivable

The following is a summary of accounts receivable at June 30, 2017 and September 30, 2016 (in thousands):

	June 30,		September 30,
	2017		2016
Accounts receivable	$	122,394	$	108,713
Less allowance for doubtful accounts		(1,514)		(2,241)
Less allowance for sales returns		(128)		(100)
Accounts receivable, net	$	120,752	$	106,372

Summary of Inventories

The following is a summary of inventories at June 30, 2017 and September 30, 2016 (in thousands):

	June 30,		September 30,
	2017		2016
Inventories
Raw materials and purchased parts	$	72,820	$	60,979
Work-in-process		11,273		16,090
Finished goods		21,211		15,503
Total inventories	$	105,304	$	92,572

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, 2017 and 2016 (in thousands):

Activity -Three Months Ended June 30, 2017
Balance						Balance
March 31,						June 30,
2017		Accruals		Costs Incurred		2017
$	7,073	$	2,440	$	(1,867)	$	7,646

Activity -Three Months Ended June 30, 2016
Balance						Balance
March 31,						June 30,
2016		Accruals		Costs Incurred		2016
$	5,735	$	2,279	$	(2,059)	$	5,955

Activity -Nine Months Ended June 30, 2017
Balance						Balance
September 30,						June 30,
2016		Accruals		Costs Incurred		2017
$	6,324	$	7,656	$	(6,334)	$	7,646

Activity -Nine Months Ended June 30, 2016
Balance						Balance
September 30,						June 30,
2015		Accruals		Costs Incurred		2016
$	6,089	$	6,989	$	(7,123)	$	5,955