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Goodwill and other Identifiable Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 83,126 $ 79,629
Accumulated amortization (70,105) (69,000)
Net 13,021 10,629
Purchased and Core Technology [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 46,603 46,597
Accumulated amortization (43,933) (43,639)
Net 2,670 2,958
Licensing Agreements [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 2,840 2,840
Accumulated amortization (2,701) (2,682)
Net 139 158
Patents and Trademarks [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 11,550 10,943
Accumulated amortization (8,746) (8,469)
Net 2,804 2,474
Customer Maintenance Contracts [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 700 700
Accumulated amortization (700) (700)
Net 0 0
Customer Relationships [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 18,929 17,504
Accumulated amortization (12,884) (12,465)
Net 6,045 5,039
Noncompete Agreements [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 2,144 1,045
Accumulated amortization (1,081) (1,045)
Net 1,063 0
Order Backlog [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 360 0
Accumulated amortization 60 0
Net $ 300 $ 0