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Significant Accounting Policies (Schedule of Acquired Intangible Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Oct. 02, 2015
Sep. 26, 2014
Acquired Finite Lived Intangible Assets [Line Items]      
Acquired intangible assets beginning balance $ 353,419 $ 440,192 $ 217,904
Acquisitions 18,172 (5,307) 264,213
Amortization (47,608) (49,368) (46,820)
Foreign currency translation 9,733 (35,517) 1,289
Acquired intangible assets ending balance $ 336,922 353,419 440,192
Weighted Average Amortization Period (years) 8 years 10 months 24 days    
Excluding Investment in AWE Management Ltd      
Acquired Finite Lived Intangible Assets [Line Items]      
Amortization $ (44,402) (45,949) (43,214)
Customer Relationships, Contracts, and Backlog      
Acquired Finite Lived Intangible Assets [Line Items]      
Acquired intangible assets beginning balance 329,341 408,041 195,527
Acquisitions 7,286 (4,315) 249,164
Foreign currency translation 9,605 (34,418) 1,087
Acquired intangible assets ending balance $ 307,637 329,341 408,041
Weighted Average Amortization Period (years) 8 years 4 months 24 days    
Customer Relationships, Contracts, and Backlog | Excluding Investment in AWE Management Ltd      
Acquired Finite Lived Intangible Assets [Line Items]      
Amortization $ (38,595) (39,967) (37,737)
Developed Technology      
Acquired Finite Lived Intangible Assets [Line Items]      
Acquired intangible assets beginning balance 15,845 17,378 18,911
Acquired intangible assets ending balance $ 14,311 15,845 17,378
Weighted Average Amortization Period (years) 9 years 3 months 18 days    
Developed Technology | Excluding Investment in AWE Management Ltd      
Acquired Finite Lived Intangible Assets [Line Items]      
Amortization $ (1,534) (1,533) (1,533)
Trade Names      
Acquired Finite Lived Intangible Assets [Line Items]      
Acquired intangible assets beginning balance 7,599 14,148 2,179
Acquisitions 859 (1,292) 15,049
Foreign currency translation 147 (1,085) 171
Acquired intangible assets ending balance $ 4,786 7,599 14,148
Weighted Average Amortization Period (years) 5 years    
Trade Names | Excluding Investment in AWE Management Ltd      
Acquired Finite Lived Intangible Assets [Line Items]      
Amortization $ (3,819) (4,172) (3,251)
Patents      
Acquired Finite Lived Intangible Assets [Line Items]      
Acquisitions 10,027    
Acquired intangible assets ending balance $ 10,027    
Weighted Average Amortization Period (years) 25 years    
Other      
Acquired Finite Lived Intangible Assets [Line Items]      
Acquired intangible assets beginning balance $ 634 625 1,287
Acquisitions   300  
Foreign currency translation (19) (14) 31
Acquired intangible assets ending balance $ 161 634 625
Weighted Average Amortization Period (years) 3 years 2 months 12 days    
Other | Excluding Investment in AWE Management Ltd      
Acquired Finite Lived Intangible Assets [Line Items]      
Amortization $ (454) $ (277) $ (693)