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Goodwill and Acquired Intangible Assets (Goodwill and Acquired Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Jul. 02, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Goodwill (not amortized), Net Book Value |  | $ 1,169,813 | $ 1,169,660 | $ 1,069,041 | $ 1,012,527
Intangible assets with finite lives (amortized), Gross Carrying Amount |  | 756,132 |  | 679,552 |
Intangible assets with finite lives (amortized), Accumulated Amortization |  | 445,827 |  | 388,251 |
Intangible assets with finite lives (amortized), Net Book Value |  | 310,305 |  | 291,301 |
Total goodwill and acquired intangible assets |  | 1,480,118 |  | 1,360,342 |
Purchased Software [Member] |  |  |  |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount | [1] | 354,595 |  | 284,257 |
Intangible assets with finite lives (amortized), Accumulated Amortization | [1] | 199,192 |  | 174,887 |
Intangible assets with finite lives (amortized), Net Book Value | [1] | $ 155,403 |  | 109,370 |
Weighted average useful lives (in years) |  | 9 years |  |  |
Capitalized Software [Member] |  |  |  |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount | [1] | $ 22,877 |  | 22,877 |
Intangible assets with finite lives (amortized), Accumulated Amortization | [1] | 22,877 |  | 22,877 |
Intangible assets with finite lives (amortized), Net Book Value | [1] | 0 |  | 0 |
Customer Lists [Member] |  |  |  |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount | [1] | 355,698 |  | 349,938 |
Intangible assets with finite lives (amortized), Accumulated Amortization | [1] | 206,515 |  | 174,017 |
Intangible assets with finite lives (amortized), Net Book Value | [1] | $ 149,183 |  | 175,921 |
Weighted average useful lives (in years) |  | 10 years |  |  |
Trademarks And Trade Names [Member] |  |  |  |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount | [1] | $ 19,007 |  | 18,534 |
Intangible assets with finite lives (amortized), Accumulated Amortization | [1] | 13,323 |  | 12,759 |
Intangible assets with finite lives (amortized), Net Book Value | [1] | $ 5,684 |  | 5,775 |
Weighted average useful lives (in years) |  | 10 years |  |  |
Other [Member] |  |  |  |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount | [1] | $ 3,955 |  | 3,946 |
Intangible assets with finite lives (amortized), Accumulated Amortization | [1] | 3,920 |  | 3,711 |
Intangible assets with finite lives (amortized), Net Book Value | [1] | $ 35 |  | $ 235 |
Weighted average useful lives (in years) |  | 3 years |  |  |
[1] | The weighted average useful lives of purchased software, capitalized software, customer lists and relationships, trademarks and trade names and other intangible assets with a remaining net book value are 9 years, 10 years, 10 years and 3 years, respectively.

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