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Cost in Excess of Net Assets of Companies Acquired - Intangibles (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Dec. 31, 2013
Mar. 29, 2014
Customer Relationships [Member]
Dec. 31, 2013
Customer Relationships [Member]
Mar. 29, 2014
Developed Technology [Member]
Dec. 31, 2013
Developed Technology [Member]
Mar. 29, 2014
Other Intangible Assets [Member]
Dec. 31, 2013
Other Intangible Assets [Member]
Mar. 29, 2014
Trade Names [Member]
Dec. 31, 2013
Trade Names [Member]
Mar. 29, 2014
Minimum [Member]
Other Intangible Assets [Member]
Mar. 29, 2014
Maximum [Member]
Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]                          
Weighted-Average Life       10 years 10 years 5 years 5 years            
Gross Carrying Amount $ 581,262   $ 567,478 $ 389,576 $ 374,244 $ 9,778 $ 9,625 $ 2,908 [1] $ 4,609 [1] $ 179,000 $ 179,000    
Accumulated Amortization (150,787)   (141,409) (144,813) (134,817) (4,609) (4,051) (1,365) [1] (2,541) [1] 0 0    
Net 430,475   426,069 244,763 239,427 5,169 5,574 1,543 [1] 2,068 [1] 179,000 179,000    
Finite-Lived Intangible Assets, Useful Life                       1 year 3 years
Amortization of Intangible Assets 10,947 8,957                      
Amortization of intangible assets, net of tax $ 8,907 $ 7,116                      
Amortization of intangible assets, per share basic $ 0.09 $ 0.07                      
Amortization of intangible assets, per share diluted $ 0.09 $ 0.07                      
[1] Consists of non-competition agreements and sales backlog with useful lives ranging from one to three years.