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Fair Value Measurements (Fair Value Measurements - Liabilities Measured on Recurring Basis Unobservable Input Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 25 $ 200
Fair value adjustments 1 (163)
Settlements (26) (12)
Ending balance $ 0 $ 25