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Other Balance Sheet Information (Tables)
 3 Months Ended
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Accounts Receivable
The following is a summary of accounts receivable at December 31, 2014 and September 30, 2014 (in thousands):
 
December 31,
2014
 
September 30,
2014
Accounts receivable
$
76,883

 
$
81,270

Less allowance for doubtful accounts
(1,082
)
 
(1,031
)
Less allowance for sales returns
(126
)
 
(133
)
 
$
75,675

 
$
80,106
Summary of Inventories
The following is a summary of inventories at December 31, 2014 and September 30, 2014, excluding amounts related to discontinued operations (in thousands):
 
December 31,
2014
 
September 30,
2014
Inventories
 
 
 
Raw materials and purchased parts
$
58,034

 
$
57,250

Work-in-process
20,538

 
20,068

Finished goods
16,364

 
16,249

 
$
94,936

 
$
93,567
Product Warranty and Retrofit Activity on Gross Basis
Product warranty and retrofit activity on a gross basis for the three months ended December 31, 2014 and 2013, excluding amounts related to discontinued operations, is as follows (in thousands):
Activity - Three months ended December 31, 2014
Balance at
September 30,
2014
 
Adjustments for
Acquisitions and Divestitures
 
Accruals
 
Costs Incurred
 
Balance at
December 31,
2014
$
6,499

 
$
81

 
$
2,717

 
$
(3,042
)
 
$
6,255


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
$
7,260

 
$
—

 
$
1,875

 
$
(2,373
)
 
$
6,762