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Goodwill and Intangible Assets Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Apr. 01, 2016
Jan. 01, 2016
Mar. 27, 2015
Dec. 26, 2014
Apr. 01, 2016
Mar. 27, 2015
Sep. 25, 2015
Finite-Lived Intangible Assets [Line Items]              
Cost $ 357,770       $ 357,770   $ 252,284
Accumulated Amortization (141,688)       (141,688)   (124,777)
Total 216,082       216,082   127,507
Purchases of intangible assets $ 0 $ 105,300 $ 0 $ 6,400 105,270 $ 6,416  
Weighted average useful life 0 years 9 years 0 years 18 years      
Amortization of Intangible Assets $ 8,200   $ 5,600   16,700 $ 11,000  
Acquired Patents And Technology [Member]              
Finite-Lived Intangible Assets [Line Items]              
Cost 278,222       278,222   172,787
Accumulated Amortization (88,261)       (88,261)   (74,398)
Total 189,961       189,961   98,389
Purchases of intangible assets         $ 105,000    
Weighted average useful life         9 years    
Customer Relationships [Member]              
Finite-Lived Intangible Assets [Line Items]              
Cost 56,826       $ 56,826   56,933
Accumulated Amortization (31,262)       (31,262)   (28,275)
Total 25,564       25,564   28,658
Other Intangibles [Member]              
Finite-Lived Intangible Assets [Line Items]              
Cost 22,722       22,722   22,564
Accumulated Amortization (22,165)       (22,165)   (22,104)
Total $ 557       557   $ 460
Purchases of intangible assets         $ 300    
Weighted average useful life         18 years