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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 30, 2017
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Operating Loss Carryforwards [Line Items]        
Federal rate adjustment to deferred taxes $ (44,800)      
Deferred tax benefit, remeasurement of deferred tax assets and liabilities 45,400      
Transition tax 100      
Tax cuts and jobs act of 2017, other legislation changes 500      
Unrecognized tax benefits that would impact effective tax rate 2,500 $ 2,500 $ 3,000  
Undistributed earnings of foreign subsidiaries 33,600 33,600    
Income tax on repatriation of foreign earnings   200    
U.S. state        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 200 200    
Tax credit carryforward, amount $ 2,300 $ 2,300    
Tax credit carryforward expiration period   20 years    
Valuation Allowance of Deferred Tax Assets        
Operating Loss Carryforwards [Line Items]        
Valuation allowances and reserves increase   $ 4,505 $ 231 $ 565