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Goodwill and other Identifiable Intangible Assets (Tables)
 9 Months Ended
Jun. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Amortizable Identifiable Intangible Assets
Amortizable identifiable intangible assets were (in thousands):
 
June 30, 2012
 
September 30, 2011
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
Purchased and core technology
$
46,318

 
$
(43,117
)
 
$
3,201

 
$
46,412

 
$
(41,716
)
 
$
4,696

License agreements
2,840

 
(2,664
)
 
176

 
2,840

 
(2,610
)
 
230

Patents and trademarks
10,732

 
(8,272
)
 
2,460

 
10,341

 
(7,505
)
 
2,836

Customer maintenance contracts
700

 
(700
)
 
—

 
700

 
(674
)
 
26

Customer relationships
17,304

 
(11,949
)
 
5,355

 
17,437

 
(10,865
)
 
6,572

Non-compete agreements
1,035

 
(1,035
)
 
—

 
1,036

 
(1,036
)
 
—

Total
$
78,929

 
$
(67,737
)
 
$
11,192

 
$
78,766

 
$
(64,406
)
 
$
14,360
Schedule of Estimated Amortization Expense Related to Identifiable Intangible Assets
Estimated amortization expense related to identifiable intangible assets for the remainder of fiscal 2012 and the five succeeding fiscal years is (in thousands):
2012 (three months)
$
939

2013
3,641

2014
2,777

2015
2,108

2016
785

2017
215
Schedule of Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill were (in thousands):
 
Nine months ended
June 30,
 
2012
 
2011
Beginning balance, October 1
$
86,012

 
$
86,210

Foreign currency translation adjustment
(468
)
 
395

Ending balance, June 30
$
85,544

 
$
86,605