Other Balance Sheet Information (Tables)

6 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Accounts Receivable

The following is a summary of accounts receivable at March 31, 2016 and September 30, 2015 (in thousands):

	March 31, 2016			September 30, 2015
Accounts receivable	$	106,090		$	87,582
Less: allowance for doubtful accounts	(1,753		)	(1,019		)
Less: allowance for sales returns	(112		)	(115		)
Accounts receivable, net	$	104,225		$	86,448

Summary of Inventories

The following is a summary of inventories at March 31, 2016 and September 30, 2015 (in thousands):

	March 31, 2016		September 30, 2015
Inventories:
Raw materials and purchased parts	$	58,112	$	62,441
Work-in-process	17,238		21,563
Finished goods	25,388		16,615
Total inventories	$	100,738	$	100,619

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 six months ended March 31, 2016 and 2015 (in thousands):

Activity - Three Months Ended March 31, 2016
Balance at December 31, 2015		Accruals		Costs Incurred			Balance at March 31, 2016
$	5,767	$	2,376	$	(2,408	)	$	5,735

Activity - Three months ended March 31, 2015
Balance at December 31, 2014		Accruals		Costs Incurred			Balance at March 31, 2015
$	6,255	$	2,428	$	(2,480	)	$	6,203

Activity - Six Months Ended March 31, 2016
Balance at September 30, 2015		Accruals		Costs Incurred			Balance at March 31, 2016
$	6,089	$	4,712	$	(5,066	)	$	5,735

Activity - Six Months Ended March 31, 2015
Balance at September 30, 2014		Adjustments for Acquisitions and Divestitures		Accruals		Costs Incurred			Balance at March 31, 2015
$	6,499	$	81	$	5,145	$	(5,522	)	$	6,203