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Shareholders' Equity (Reclassifications from Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 02, 2016
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Selling and administrative expenses   $ 667,744 $ 672,125 $ 649,055
Tax (expense) or benefit   (43,273) (51,764) (43,776)
Net income   85,638 105,406 61,155
Net   (628) (1,627) (114)
Derivative financial instruments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net   (628) (1,627) $ (114)
Reclassifications from accumulated other comprehensive income (loss) | Derivative financial instruments | Interest rate swap        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income or (expense)   (993) 0  
Tax (expense) or benefit   365 0  
Net income   (628) 0  
Reclassifications from accumulated other comprehensive income (loss) | Derivative financial instruments | Diesel hedge        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Selling and administrative expenses   0 (2,562)  
Tax (expense) or benefit   0 935  
Net income $ (1,300) $ 0 $ (1,627)