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Goodwill and Intangible Assets (Goodwill and Acquired Intangible Assets) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Apr. 01, 2017 | Sep. 30, 2016
Goodwill (not amortized), Net Book Value |  | $ 1,161,731 | $ 1,169,813
Intangible assets with finite lives (amortized), Gross Carrying Amount | [1] | 748,263 | 756,132
Intangible assets with finite lives (amortized), Accumulated Amortization | [1] | 468,417 | 445,827
Intangible assets with finite lives (amortized), Net Book Value | [1] | 279,846 | 310,305
Intangible Assets, Net (Including Goodwill) |  | 1,441,577 | 1,480,118
Purchased Software |  |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount |  | 351,671 | 354,595
Intangible assets with finite lives (amortized), Accumulated Amortization |  | 209,295 | 199,192
Intangible assets with finite lives (amortized), Net Book Value | [1] | $ 142,376 | 155,403
Acquired finite-lived intangible asset, weighted average useful life |  | 9 years |
Capitalized Software |  |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount |  | $ 22,877 | 22,877
Intangible assets with finite lives (amortized), Accumulated Amortization |  | 22,877 | 22,877
Intangible assets with finite lives (amortized), Net Book Value | [1] | 0 | 0
Customer Lists and Relationships |  |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount |  | 350,994 | 355,698
Intangible assets with finite lives (amortized), Accumulated Amortization |  | 218,841 | 206,515
Intangible assets with finite lives (amortized), Net Book Value | [1] | $ 132,153 | 149,183
Acquired finite-lived intangible asset, weighted average useful life |  | 10 years |
Trademarks and Trade Names |  |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount |  | $ 18,843 | 19,007
Intangible assets with finite lives (amortized), Accumulated Amortization |  | 13,526 | 13,323
Intangible assets with finite lives (amortized), Net Book Value | [1] | $ 5,317 | 5,684
Acquired finite-lived intangible asset, weighted average useful life |  | 10 years |
Other |  |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount |  | $ 3,878 | 3,955
Intangible assets with finite lives (amortized), Accumulated Amortization |  | 3,878 | 3,920
Intangible assets with finite lives (amortized), Net Book Value | [1] | $ 0 | $ 35
Acquired finite-lived intangible asset, weighted average useful life |  | 0 years |
[1] | The weighted average useful lives of purchased software, customer lists and relationships, and trademarks and trade names with a remaining net book value are 9 years, 10 years, and 10 years, respectively.

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + 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=26713463&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=26713463&loc=d3e16323-109275 + 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=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
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