Contingencies And Commitments (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 29, 2020 USD ($)
Contingencies, Commitments And Guarantees [Line Items]
Aggregate notional value standby letters of credit	$ 35,454
Minimum [Member]
Contingencies, Commitments And Guarantees [Line Items]
Expiration period, minimum in months and maximum in years	1 month
Maximum [Member]
Contingencies, Commitments And Guarantees [Line Items]
Expiration period, minimum in months and maximum in years	5 years
Settled Litigation | Wage and Hour Action California
Contingencies, Commitments And Guarantees [Line Items]
Settlement liability	$ 2,400