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Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Reclassifications from Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Selling and administrative expenses $ (671,831) $ (667,744) $ (672,125)
Tax (expense) or benefit 19,286 (43,273) (51,764)
Net income 89,898 85,638 105,406
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) (330) (993) 0
Tax (expense) or benefit 121 365 0
Net income (209) (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 0 (2,562)
Tax (expense) or benefit 0 0 935
Net income $ 0 $ 0 $ (1,627)