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Goodwill And Intangible Assets (Components Of Intangible Assets) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017
Finite-Lived Intangible Assets |  |
Weighted-Average Life (years) | 12 years |
Gross Carrying Amount | $ 317,416 | $ 345,185
Accumulated Amortization | $ (203,360) | (236,367)
Customer-Related |  |
Finite-Lived Intangible Assets |  |
Weighted-Average Life (years) | 11 years |
Gross Carrying Amount | $ 147,256 | 175,872
Accumulated Amortization | $ (96,394) | (128,019)
Technology-Related |  |
Finite-Lived Intangible Assets |  |
Weighted-Average Life (years) | 9 years |
Gross Carrying Amount | $ 71,442 | 71,924
Accumulated Amortization | $ (50,665) | (55,069)
Program-Related |  |
Finite-Lived Intangible Assets |  |
Weighted-Average Life (years) | 19 years |
Gross Carrying Amount | $ 69,020 | 66,458
Accumulated Amortization | $ (34,007) | (30,675)
Marketing-Related |  |
Finite-Lived Intangible Assets |  |
Weighted-Average Life (years) | 8 years |
Gross Carrying Amount | $ 25,135 | 26,552
Accumulated Amortization | $ (18,642) | (19,251)
Other Intangible Assets |  |
Finite-Lived Intangible Assets |  |
Weighted-Average Life (years) | 10 years |
Gross Carrying Amount | $ 4,563 | 4,379
Accumulated Amortization | $ (3,652) | $ (3,353)

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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=66006027&loc=d3e16323-109275 + 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=66006027&loc=d3e16323-109275 + Details
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