Other Balance Sheet Information (Tables)

9 Months Ended

Jun. 30, 2013

Summary of Accounts Receivable

The following is a summary of accounts receivable at June 30, 2013 and September 30, 2012 (in thousands):

	June 30, 2013		September 30, 2012
Accounts receivable	$	87,213	$	79,706
Less allowances	927		851
	$	86,286	$	78,855

Summary of Inventories

The following is a summary of inventories at June 30, 2013 and September 30, 2012 (in thousands):

	June 30, 2013		September 30, 2012
Inventories
Raw materials and purchased parts	$	56,968	$	64,732
Work-in-process	19,482		20,800
Finished goods	16,350		17,453
	$	92,800	$	102,985

Product Warranty and Retrofit Activity on Gross Basis

Product warranty and retrofit activity on a gross basis for the three and nine months ended June 30, 2013 and 2012 is as follows (in thousands):

Activity — Three Months Ended June 30, 2013

Balance March 31, 2013		Adjustments for acquisitions and divestitures		Accruals		Costs incurred			Balance June 30, 2013
$	7,725	$	—	$	3,022	$	(3,043	)	$	7,704

Activity — Three Months Ended June 30, 2012

Balance March 31, 2012		Adjustments for acquisitions and divestitures		Accruals		Costs incurred			Balance June 30, 2012
$	7,281	$	—	$	3,365	$	(3,276	)	$	7,370

Activity — Nine Months Ended June 30, 2013

Balance September 30, 2012		Adjustments for acquisitions and divestitures		Accruals		Costs incurred			Balance June 30, 2013
$	7,329	$	962	$	8,391	$	(8,978	)	$	7,704

Activity — Nine Months Ended June 30, 2012

Balance September 30, 2011		Adjustments for acquisitions and divestitures		Accruals		Costs incurred			Balance June 30, 2012
$	7,438	$	7	$	10,288	$	(10,363	)	$	7,370