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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Operating Loss Carryforwards.    
Increase (Decrease) in valuation allowance $ 2.9 $ 3.9
U.S. federal statutory tax 21.00% 21.00%
Net operating loss carryforwards, which will expire from 2019 through 2037 $ 104.2  
Net operating loss carryforwards, which will be carried forward indefinitely 27.6  
Unrecognized Tax Benefits 0.0  
Federal    
Operating Loss Carryforwards.    
Net operating loss carryforwards 131.8  
Tax credit carryforwards $ 1.8  
Tax Credit Carryforward, Expiration Date Dec. 31, 2026  
State and Local Jurisdiction    
Operating Loss Carryforwards.    
Net operating loss carryforwards $ 71.9  
Operating Loss Carryforwards, Expiration Date Dec. 31, 2029  
Tax credit carryforwards $ 1.9  
Foreign Tax Authority    
Operating Loss Carryforwards.    
Net operating loss carryforwards $ 2.5