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Adoption of new revenue recognition guidance - Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
New Accounting Pronouncement, Early Adoption [Line Items]      
Net cash provided by operating activities $ 276,908 $ 276,827 $ 262,742
Net cash provided by (used in) investing activities (13,854) 1,343 (35,467)
Net cash provided by (used in) financing activities 418,641 (179,178) (101,589)
Increase in cash, cash equivalents, and restricted cash 682,267 98,717 $ 124,757
Restated      
New Accounting Pronouncement, Early Adoption [Line Items]      
Net cash provided by operating activities 283,357 282,479  
Net cash provided by (used in) investing activities (20,303) (4,309)  
Net cash provided by (used in) financing activities 418,641 (179,178)  
Increase in cash, cash equivalents, and restricted cash 682,267 98,717  
Restatement Adjustment      
New Accounting Pronouncement, Early Adoption [Line Items]      
Net cash provided by operating activities 6,449 5,652  
Net cash provided by (used in) investing activities $ (6,449) $ (5,652)