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Goodwill and other Identifiable Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Sep. 30, 2011
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 79,629 | $ 78,766
Accumulated amortization | (69,000) | (64,406)
Net | 10,629 | 14,360
Purchased and Core Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 46,597 | 46,412
Accumulated amortization | (43,639) | (41,716)
Net | 2,958 | 4,696
Licensing Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 2,840 | 2,840
Accumulated amortization | (2,682) | (2,610)
Net | 158 | 230
Patents and Trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 10,943 | 10,341
Accumulated amortization | (8,469) | (7,505)
Net | 2,474 | 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 | 17,504 | 17,437
Accumulated amortization | (12,465) | (10,865)
Net | 5,039 | 6,572
Noncompete Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 1,045 | 1,036
Accumulated amortization | (1,045) | (1,036)
Net | $ 0 | $ 0

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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