Other Balance Sheet Information (Tables)

9 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Accounts Receivable

The following is a summary of accounts receivable at June 30, 2018 and September 30, 2017 (in thousands):

	June 30,		September 30,
	2018		2017
Accounts receivable	$	157,872	$	122,868
Less allowance for doubtful accounts		(1,142)		(1,959)
Less allowance for sales returns		(52)		(81)
Accounts receivable, net	$	156,678	$	120,828

Summary of Inventories

The following is a summary of inventories at June 30, 2018 and September 30, 2017 (in thousands):

	June 30,		September 30,
	2018		2017
Inventories
Raw materials and purchased parts	$	83,603	$	73,819
Work-in-process		21,699		10,548
Finished goods		26,996		22,028
Total inventories	$	132,298	$	106,395

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, 2018 and 2017 (in thousands):

Activity -Three Months Ended June 30, 2018
Balance						Balance
March 31,						June 30,
2018		Accruals		Costs Incurred		2018
$	8,289	$	1,895	$	(1,425)	$	8,759

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 -Nine Months Ended June 30, 2018
Balance						Balance
September 30,						June 30,
2017		Accruals		Costs Incurred		2018
$	8,054	$	6,304	$	(5,599)	$	8,759

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