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Other Balance Sheet Information (Tables)
 3 Months Ended
Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Accounts Receivable
The following is a summary of accounts receivable at December 31, 2013 and September 30, 2013 (in thousands):
 
December 31,
2013
 
September 30,
2013
Accounts receivable
$
76,800

 
$
78,460

Less allowance for doubtful accounts
(1,131
)
 
(863
)
Less allowance for sales returns
(140
)
 
$
(114
)
 
$
75,529

 
$
77,483
Summary of Inventories
The following is a summary of inventories at December 31, 2013 and September 30, 2013 (in thousands):
 
December 31,
2013
 
September 30,
2013
Inventories
 
 
 
Raw materials and purchased parts
$
61,565

 
$
60,106

Work-in-process
17,285

 
20,256

Finished goods
17,851

 
17,357

 
$
96,701

 
$
97,719
Product Warranty and Retrofit Activity on Gross Basis
Product warranty and retrofit activity on a gross basis for the three months ended December 31, 2013 and 2012 is as follows (in thousands):
Activity — Three Months Ended December 31, 2013
Balance at
September 30,
2013
 
Adjustments for
Acquisitions and Divestitures
 
Accruals
 
Costs Incurred
 
Balance at
December 31,
2013
$
7,349

 
$
—

 
$
1,916

 
$
(2,419
)
 
$
6,846


Activity — Three Months Ended December 31, 2012
Balance at
September 30,
2012
 
Adjustments for
Acquisitions and Divestitures
 
Accruals
 
Costs Incurred
 
Balance at
December 31,
2012
$
7,329

 
$
962

 
$
2,363

 
$
(2,930
)
 
$
7,724