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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jul. 01, 2017
Dec. 31, 2016
Dec. 26, 2015
Attributable To Redeemable Noncontrolling Interests [Abstract]      
Redeemable noncontrolling interests $ 747,022 $ 607,636 $ 542,194
Estimate of Fair Value Measurement [Member]      
Debt Instrument, Fair Value Disclosure [Abstract]      
Fair value of debt 1,402,300 1,218,900  
Fair value, measurements, recurring [Member]      
Assets [Abstract]      
Derivative contracts - assets 6,413 1,240  
Total assets 6,413 1,240  
Liabilities [Abstract]      
Derivative contracts - liabilities 2,229 931  
Total liabilities 2,229 931  
Attributable To Redeemable Noncontrolling Interests [Abstract]      
Redeemable noncontrolling interests 747,022 607,636  
Fair value, measurements, recurring [Member] | Level 1 [Member]      
Assets [Abstract]      
Derivative contracts - assets 0 0  
Total assets 0 0  
Liabilities [Abstract]      
Derivative contracts - liabilities 0 0  
Total liabilities 0 0  
Attributable To Redeemable Noncontrolling Interests [Abstract]      
Redeemable noncontrolling interests 0 0  
Fair value, measurements, recurring [Member] | Level 2 [Member]      
Assets [Abstract]      
Derivative contracts - assets 6,413 1,240  
Total assets 6,413 1,240  
Liabilities [Abstract]      
Derivative contracts - liabilities 2,229 931  
Total liabilities 2,229 931  
Attributable To Redeemable Noncontrolling Interests [Abstract]      
Redeemable noncontrolling interests 0 0  
Fair value, measurements, recurring [Member] | Level 3 [Member]      
Assets [Abstract]      
Derivative contracts - assets 0 0  
Total assets 0 0  
Liabilities [Abstract]      
Derivative contracts - liabilities 0 0  
Total liabilities 0 0  
Attributable To Redeemable Noncontrolling Interests [Abstract]      
Redeemable noncontrolling interests $ 747,022 $ 607,636