Summary Of Significant Accounting Policies (Summary of Balance Sheet Restatement Adjustments) (Details) - USD ($) $ in Thousands	Mar. 29, 2015	Dec. 28, 2014	Dec. 29, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other current assets	$ 18,464	$ 25,928
Total current assets	344,254	390,602
Total assets	676,656	738,666
Other current liabilities	15,713	17,504
Total current liabilities	146,788	158,051
Deferred income taxes	14,498	15,369
Accumulated deficit	(14,890)	(12,331)
Total stockholders' equity	293,993	327,931	$ 346,325
Total liabilities and stockholders' equity	676,656	$ 738,666
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other current assets	21,245
Total current assets	347,035
Total assets	679,437
Other current liabilities	16,058
Total current liabilities	147,133
Deferred income taxes	15,120
Accumulated deficit	(13,076)
Total stockholders' equity	295,807
Total liabilities and stockholders' equity	679,437
Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other current assets	(2,781)
Total current assets	(2,781)
Total assets	(2,781)
Other current liabilities	(345)
Total current liabilities	(345)
Deferred income taxes	(622)
Accumulated deficit	(1,814)
Total stockholders' equity	(1,814)
Total liabilities and stockholders' equity	$ (2,781)