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Goodwill and other Identifiable Intangible Assets (Tables)
 6 Months Ended
Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Amortizable Identifiable Intangible Assets
Amortizable identifiable intangible assets were (in thousands):
 
March 31, 2013
 
September 30, 2012
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
Purchased and core technology
$
46,177

 
$
(43,847
)
 
$
2,330

 
$
46,597

 
$
(43,639
)
 
$
2,958

License agreements
2,840

 
(2,719
)
 
121

 
2,840

 
(2,682
)
 
158

Patents and trademarks
11,729

 
(9,018
)
 
2,711

 
10,943

 
(8,469
)
 
2,474

Customer maintenance contracts
700

 
(700
)
 
—

 
700

 
(700
)
 
—

Customer relationships
18,641

 
(13,083
)
 
5,558

 
17,504

 
(12,465
)
 
5,039

Non-compete agreements
2,129

 
(1,121
)
 
1,008

 
1,045

 
(1,045
)
 
—

Order backlog
360

 
(150
)
 
210

 
—

 
—

 
—

Total
$
82,576

 
$
(70,638
)
 
$
11,938

 
$
79,629

 
$
(69,000
)
 
$
10,629
Schedule of Estimated Amortization Expense Related to Identifiable Intangible Assets
Estimated amortization expense related to identifiable intangible assets for the remainder of fiscal 2013 and the five succeeding fiscal years is (in thousands):
2013 (six months)
$
2,246

2014
3,871

2015
2,660

2016
1,323

2017
696

2018
482
Schedule of Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill are (in thousands):
 
Six months ended
March 31,
 
2013
 
2012
Beginning balance, October 1
$
86,209

 
$
86,012

Acquisition of Etherios, Inc.
17,120

 
—

Foreign currency translation adjustment
(856
)
 
102

Ending balance, March 31
$
102,473

 
$
86,114