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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 25, 2016
Dec. 27, 2015
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense $ 68,700 $ 68,700      
Self insurance reserve 38,000 38,000 $ 38,000    
Net cash provided by/(used in) operating activities   (86,712) (103,876) $ (179,075)  
Net cash provided by (used in) financing activities   (26,019) (237,024) (217,960)  
Change in restricted cash   (21,019) (128,272) 30,703  
Adjustment to opening retained earnings 1,310,136 1,310,136 1,331,911    
Accounting Standards Update 2016-09 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Excess tax windfalls for share-based payments   3,600      
Net cash provided by/(used in) operating activities     9,600 3,700  
Net cash provided by (used in) financing activities     9,600 $ 3,700  
Accounting Standards Update 2016-18 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Change in restricted cash   $ 6,900 $ 3,800    
Maximum [Member] | Building and Building Improvements [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life   40 years      
Maximum [Member] | Equipment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life   30 years      
Maximum [Member] | Computer Software, Intangible Asset [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life   5 years      
Minimum [Member] | Building and Building Improvements [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life   10 years      
Minimum [Member] | Equipment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life   3 years      
Minimum [Member] | Computer Software, Intangible Asset [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life   2 years      
Letter of Credit [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Securities pledged as collateral $ 63,100 $ 63,100      
Subsequent Event [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Maximum [Member] | Accounting Standards Update 2014-09 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Adjustment to opening retained earnings         $ 6,000
Subsequent Event [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Minimum [Member] | Accounting Standards Update 2014-09 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Adjustment to opening retained earnings         $ 3,000