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Equity - Treasury Shares (Details) - USD ($)
shares in Millions
 6 Months Ended 12 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Dec. 27, 2014
Dec. 28, 2013
Dec. 25, 2010
Jul. 31, 2010
Treasury Shares            
Purchase of treasury stock $ 99,486,000 $ 101,609,000        
2010 Share Repurchase Program            
Treasury Shares            
Authorized stock repurchase amount $ 1,150,000,000         $ 500,000,000
Stock repurchased during period (in shares) 1.2 1.7        
Purchase of treasury stock $ 90,800,000 $ 90,300,000        
Authorized increase, stock repurchase     $ 150,000,000 $ 250,000,000 $ 250,000,000  
Remaining authorized repurchase amount $ 87,600,000          
2007 Incentive Plan            
Treasury Shares            
Number of shares of common stock repurchased (in shares) 0.1 0.1        
Open market repurchases            
Treasury Shares            
Purchase of treasury stock $ 8,700,000 $ 6,700,000