Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 30, 2017

Accumulated Other Comprehensive Income [Abstract]

Schedule of Accumulated Other Comprehensive Income

		Unrealized Gains
		on Available-for-Sale
(dollars in thousands)		Marketable Securities
Accumulated other comprehensive income balance as of December 26, 2015	$	4,761
Other comprehensive income before reclassifications		348
Amounts reclassified from accumulated other comprehensive income		(257)
Net current period other comprehensive loss		91
Accumulated other comprehensive income balance as of December 31, 2016	$	4,852
Other comprehensive loss before reclassifications		(43)
Accumulated change in effective tax rate		1,042
Amounts reclassified from accumulated other comprehensive income		29
Net current period other comprehensive income		1,028
Accumulated other comprehensive income balance as of December 30, 2017	$	5,880

Schedule Of Reclassifications out of Accumulated Other Comprehensive Income

		Amounts Reclassified from
		Accumulated Other Comprehensive Income to the
		Consolidated Statements of Income
(dollars in thousands)	Location	2017		2016		2015
Unrealized gains (losses) on available-for-sale marketable securities
	Investment income and interest expense	$	(40)	$	437	$	27
	Provision for income taxes		11		(180)		(11)
Total amount reclassified, net of tax		$	(29)	$	257	$	16