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Goodwill and Intangible Assets (Goodwill and Acquired Intangible Assets) (Details) - USD ($) $ in Thousands | Mar. 28, 2020 | Sep. 30, 2019
--- | --- | ---
Goodwill (not amortized) | $ 1,603,081 | $ 1,238,179
Intangible assets with finite lives (amortized), Gross Carrying Amount | 889,489 | 778,968
Intangible assets with finite lives (amortized), Accumulated Amortization | 638,298 | 609,019
Intangible assets with finite lives (amortized), Net Book Value | 251,191 | 169,949
Intangible Assets, Net (Including Goodwill) | 1,854,272 | 1,408,128
Purchased software |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount | 427,092 | 377,359
Intangible assets with finite lives (amortized), Accumulated Amortization | 292,756 | 278,144
Intangible assets with finite lives (amortized), Net Book Value | 134,336 | 99,215
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 | 0 | 0
Customer lists and relationships |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount | 413,054 | 355,931
Intangible assets with finite lives (amortized), Accumulated Amortization | 303,095 | 288,828
Intangible assets with finite lives (amortized), Net Book Value | 109,959 | 67,103
Trademarks and trade names |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount | 22,524 | 18,891
Intangible assets with finite lives (amortized), Accumulated Amortization | 15,628 | 15,260
Intangible assets with finite lives (amortized), Net Book Value | 6,896 | 3,631
Other |  |
Intangible assets with finite lives (amortized), Gross Carrying Amount | 3,942 | 3,910
Intangible assets with finite lives (amortized), Accumulated Amortization | 3,942 | 3,910
Intangible assets with finite lives (amortized), Net Book Value | $ 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/disclosureRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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