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Significant Accounting Policies (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 29, 2017 | Sep. 30, 2016 | Oct. 02, 2015
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets beginning balance | $ 336,922 | $ 353,419 | $ 440,192
Acquisitions | 35,905 | 18,172 | (5,307)
Amortization | (46,095) | (47,608) | (49,368)
Foreign currency translation | 4,305 | 9,733 | (35,517)
Acquired intangible assets ending balance | $ 332,920 | 336,922 | 353,419
Weighted Average Amortization Period (years) | 8 years 3 months 19 days |  |
Excluding Investment in AWE Management Ltd |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amortization | $ (44,212) | (44,402) | (45,949)
Customer Relationships, Contracts, and Backlog |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets beginning balance | 307,637 | 329,341 | 408,041
Acquisitions | 29,803 | 7,286 | (4,315)
Foreign currency translation | 3,707 | 9,605 | (34,418)
Acquired intangible assets ending balance | $ 301,468 | 307,637 | 329,341
Weighted Average Amortization Period (years) | 7 years 10 months 24 days |  |
Customer Relationships, Contracts, and Backlog | Excluding Investment in AWE Management Ltd |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amortization | $ (39,679) | (38,595) | (39,967)
Developed Technology |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets beginning balance | 14,311 | 15,845 | 17,378
Acquisitions | 1,685 |  |
Acquired intangible assets ending balance | $ 14,462 | 14,311 | 15,845
Weighted Average Amortization Period (years) | 7 years 8 months 12 days |  |
Developed Technology | Excluding Investment in AWE Management Ltd |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amortization | $ (1,534) | (1,534) | (1,533)
Trade Names |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets beginning balance | 4,786 | 7,599 | 14,148
Acquisitions | 4,417 | 859 | (1,292)
Foreign currency translation | 45 | 147 | (1,085)
Acquired intangible assets ending balance | $ 6,699 | 4,786 | 7,599
Weighted Average Amortization Period (years) | 4 years 4 months 24 days |  |
Trade Names | Excluding Investment in AWE Management Ltd |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amortization | $ (2,549) | (3,819) | (4,172)
Patents |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets beginning balance | 10,027 |  |
Acquisitions |  | 10,027 |
Foreign currency translation | 553 |  |
Acquired intangible assets ending balance | $ 10,180 | 10,027 |
Weighted Average Amortization Period (years) | 24 years |  |
Patents | Excluding Investment in AWE Management Ltd |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amortization | $ (400) |  |
Other |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets beginning balance | 161 | 634 | 625
Acquisitions |  |  | 300
Foreign currency translation |  | (19) | (14)
Acquired intangible assets ending balance | $ 111 | 161 | 634
Weighted Average Amortization Period (years) | 2 years 2 months 13 days |  |
Other | Excluding Investment in AWE Management Ltd |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Amortization | $ (50) | $ (454) | $ (277)

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