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Other Balance Sheet Information (Tables)
 12 Months Ended
Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Accounts Receivable
The following is a summary of accounts receivable at September 30, 2013 and 2012 (in thousands):
 
September 30,
 
2013
 
2012
Accounts receivable
$
78,460

 
$
79,706

Less allowance for doubtful accounts
(863
)
 
(851
)
Less allowance for sales returns
(114
)
 
—

 
$
77,483

 
$
78,855
Allowance for Doubtful Accounts Activity
The allowance for doubtful accounts activity for the years ended September 30, 2013, 2012 and 2011 were as follows (in thousands):
Description
 
Balance at
Beginning  of
Period
 
Provisions
 
Reversals of
Bad Debt
Expense
 
Write-offs and
Adjustments
 
Balance at
End of
Period
2013 Allowance for doubtful accounts
 
$
851

 
$
48

 
$
(143
)
 
$
107

 
$
863

2012 Allowance for doubtful accounts
 
617

 
367

 
(130
)
 
(3
)
 
851

2011 Allowance for doubtful accounts
 
491

 
—

 
—

 
126

 
617

As part of the acquisition of Crossing in fiscal year 2013, the Company acquired a contract in which a certain customer has a right of return on the purchase of spare parts. The allowance for returns activity for the year ended September 30, 2013 was as follows (in thousands):
Description
Balance at
Beginning  of
Period
 
Provisions
 
Write-offs and
Adjustments
 
Balance at
End of
Period
2013 Allowance for sales returns
$
—

 
$
72

 
$
42

 
$
114
Summary of Inventories
The following is a summary of inventories at September 30, 2013 and 2012 (in thousands):
 
September 30,
 
2013
 
2012
Inventories
 
 
 
Raw materials and purchased parts
$
60,106

 
$
64,732

Work-in-process
20,256

 
20,800

Finished goods
17,357

 
17,453

 
$
97,719

 
$
102,985
Product Warranty and Retrofit Activity on a Gross Basis
The Company provides for the estimated cost of product warranties, primarily from historical information, at the time product revenue is recognized and retrofit accruals at the time retrofit programs are established. The Company’s warranty obligation is affected by product failure rates, utilization levels, material usage, service delivery costs incurred in correcting a product failure, and supplier warranties on parts delivered to the Company. Product warranty and retrofit activity on a gross basis for the years ended September 30, 2013, 2012 and 2011 is as follows (in thousands):
Balance at September 30, 2010
$
8,195

Adjustments for acquisitions and divestitures
698

Accruals for warranties during the year
11,299

Costs incurred during the year
(12,754
)
Balance at September 30, 2011
7,438

Adjustments for acquisitions and divestitures
7

Accruals for warranties during the year
13,751

Costs incurred during the year
(13,867
)
Balance at September 30, 2012
7,329

Adjustments for acquisitions and divestitures
1,187

Accruals for warranties during the year
10,111

Costs incurred during the year
(11,278
)
Balance at September 30, 2013
$
7,349