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Goodwill and other Identifiable Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Sep. 30, 2011
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 78,929 $ 78,766
Accumulated amortization (67,737) (64,406)
Net 11,192 14,360
Purchased and Core Technology [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 46,318 46,412
Accumulated amortization (43,117) (41,716)
Net 3,201 4,696
Licensing Agreements [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 2,840 2,840
Accumulated amortization (2,664) (2,610)
Net 176 230
Patents and Trademarks [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 10,732 10,341
Accumulated amortization (8,272) (7,505)
Net 2,460 2,836
Customer Maintenance Contracts [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 700 700
Accumulated amortization (700) (674)
Net 0 26
Customer Relationships [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 17,304 17,437
Accumulated amortization (11,949) (10,865)
Net 5,355 6,572
Noncompete Agreements [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 1,035 1,036
Accumulated amortization (1,035) (1,036)
Net $ 0 $ 0