Summary Of Significant Accounting Policies (Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 29, 2015	Mar. 30, 2014	Dec. 28, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
(Loss) earnings before income taxes	$ (674)	$ 1,091
Income tax benefit	(71)	(1,220)
Net loss	(745)	(129)	10,953
Reclassification Out Of Accumulated Other Comprehensive Income (Loss) | Amortization of pension plan items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Actuarial loss	(750)	(385)
Prior service cost	(6)	(3)
(Loss) earnings before income taxes	(756)	(388)
Income tax benefit	3	110
Net loss	$ (753)	$ (278)