Other Balance Sheet Information (Tables)

6 Months Ended

Mar. 31, 2013

Summary of Accounts Receivable

The following is a summary of accounts receivable at March 31, 2013 and September 30, 2012 (in thousands):

	March 31, 2013		September 30, 2012
Accounts receivable	$	74,621	$	79,706
Less allowances	1,076		851
	$	73,545	$	78,855

Summary of Inventories

The following is a summary of inventories at March 31, 2013 and September 30, 2012 (in thousands):

	March 31, 2013		September 30, 2012
Inventories
Raw materials and purchased parts	$	60,762	$	64,732
Work-in-process	20,659		20,800
Finished goods	15,180		17,453
	$	96,601	$	102,985

Product Warranty and Retrofit Activity on Gross Basis

Product warranty and retrofit activity on a gross basis for the three and six months ended March 31, 2013 and 2012 is as follows (in thousands):

Activity — Three Months Ended March 31, 2013

Balance December  31, 2012		Adjustments for acquisitions and divestitures		Accruals		Costs incurred			Balance March 31, 2013
$	7,724	$	—	$	3,006	$	(3,005	)	$	7,725

Activity — Three Months Ended March 31, 2012

Balance December  31, 2011		Adjustments for acquisitions and divestitures		Accruals		Costs incurred			Balance March 31, 2012
$	7,293	$	—	$	3,405	$	(3,417	)	$	7,281

Activity — Six Months Ended March 31, 2013

Balance September 30, 2012		Adjustments for acquisitions and divestitures		Accruals		Costs incurred			Balance March 31, 2013
$	7,329	$	962	$	5,369	$	(5,935	)	$	7,725

Activity — Six Months Ended March 31, 2012

Balance September 30, 2011		Adjustments for acquisitions and divestitures		Accruals		Costs incurred			Balance March 31, 2012
$	7,438	$	7	$	6,923	$	(7,087	)	$	7,281