Debt (Schedule Of Long-Term Debt) (Details) - USD ($)	Mar. 27, 2016	Dec. 27, 2015
Debt Instrument [Line Items]
Bank overdraft credit facility	$ 91,000	$ 40,000
Capital leases with maturities through 2021	619,000	601,000
Total	70,710,000	70,641,000
Less current portion	338,000	279,000
Total long-term portion	70,372,000	70,362,000
Face value	200,000,000	200,000,000
2013 $200 Million Variable Interest Rate Revolving Facility Maturing in 2018 | Senior Secured Credit Facility
Debt Instrument [Line Items]
$200 million variable interest rate revolving credit facility maturing in 2018	$ 70,000,000	$ 70,000,000