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Cost in Excess of Net Assets of Companies Acquired - Intangibles (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Dec. 31, 2014
Finite And Indefinite Lived Intangible Assets [Line Items]          
Gross Carrying Amount $ 627,848   $ 627,848   $ 513,561
Accumulated Amortization (213,420)   (213,420)   (177,850)
Net 414,428   414,428   $ 335,711
Amortization of Intangible Assets 14,269 $ 11,108 39,293 $ 32,925  
Amortization of intangible assets, net of tax $ 11,521 $ 9,086 $ 31,719 $ 26,860  
Amortization of intangible assets, per share basic $ 0.12 $ 0.09 $ 0.33 $ 0.27  
Amortization of intangible assets, per share diluted $ 0.12 $ 0.09 $ 0.33 $ 0.27  
Customer Relationships [Member]          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Weighted-Average Life 10 years       10 years
Gross Carrying Amount $ 512,760   $ 512,760   $ 402,036
Accumulated Amortization (205,296)   (205,296)   (171,071)
Net $ 307,464   307,464   $ 230,965
Developed Technology [Member]          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Weighted-Average Life 5 years       5 years
Gross Carrying Amount $ 13,150   13,150   $ 8,806
Accumulated Amortization (7,234)   (7,234)   (5,444)
Net 5,916   5,916   3,362
Other Intangible Assets [Member]          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Gross Carrying Amount [1] 938   938   1,719
Accumulated Amortization [1] (890)   (890)   (1,335)
Net [1] 48   48   384
Trade Names [Member]          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Gross Carrying Amount 101,000   101,000   101,000
Accumulated Amortization 0   0   0
Net $ 101,000   $ 101,000   $ 101,000
Minimum [Member] | Other Intangible Assets [Member]          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Useful Life     2 years    
Maximum [Member] | Other Intangible Assets [Member]          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Useful Life     3 years    
[1] Consists of non-competition agreements with useful lives ranging from two to three years.