Annual report pursuant to Section 13 and 15(d)

Investments (Schedule Of Held-To-Maturity Securities) (Details)

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Investments (Schedule Of Held-To-Maturity Securities) (Details) - USD ($)
Dec. 28, 2019
Dec. 29, 2018
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 0 $ 63,539,000
Unrecognized Holding Gains   1,000
Unrecognized Holding Losses   (46,000)
Estimated Fair Value   63,494,000
Corporate Bonds [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   57,554,000
Unrecognized Holding Gains   1,000
Unrecognized Holding Losses   (46,000)
Estimated Fair Value   57,509,000
Commercial Paper [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   5,985,000
Estimated Fair Value   $ 5,985,000