Prepaid Expenses And Other Current Assets (Schedule Of Prepaid Expenses And Other Current Assets) (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Prepaid Expenses And Other Current Assets [Abstract]
Prepaid insurance	$ 2,351	$ 1,577
Other prepaid expenses	7,807	7,713
Federal income taxes receivable	2,042	6,402
Miscellaneous receivables, net	6,720	7,629
Deferred commissions	1,671	2,039
Other current assets	4,953	7,162
Prepaid expenses and other current assets	$ 25,544	$ 32,522