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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 24, 2016
Dec. 26, 2015
Dec. 27, 2014
Fair Value Disclosures [Abstract]      
Fair value of debt $ 1,068,600 $ 809,700  
Attributable To Redeemable Noncontrolling Interests [Abstract]      
Redeemable noncontrolling interests 571,369 542,194 $ 564,527
Fair value, measurements, recurring [Member]      
Assets [Abstract]      
Derivative contracts - assets 1,201 4,289  
Total assets 1,201 4,289  
Liabilities [Abstract]      
Derivative contracts - liabilities 1,068 2,477  
Total liabilities 1,068 2,477  
Attributable To Redeemable Noncontrolling Interests [Abstract]      
Redeemable noncontrolling interests 571,369 542,194  
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 1,201 4,289  
Total assets 1,201 4,289  
Liabilities [Abstract]      
Derivative contracts - liabilities 1,068 2,477  
Total liabilities 1,068 2,477  
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 $ 571,369 $ 542,194