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Taxes on income from continuing operations (Tables)
6 Months Ended
Jun. 26, 2016
Income Tax Disclosure [Abstract]  
Effective Income Tax Rate
 
Three Months Ended
 
Six Months Ended
 
June 26, 2016
 
June 28, 2015
 
June 26, 2016
 
June 28, 2015
Effective income tax rate
11.9%
 
10.5%
 
8.8%
 
14.7%