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Summary Of Significant Accounting Policies (Schedule Of Basic And Diluted Earnings Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 27, 2013
Jun. 28, 2013
Mar. 29, 2013
Dec. 28, 2012
Sep. 28, 2012
Jun. 29, 2012
Mar. 30, 2012
Dec. 30, 2011
Sep. 27, 2013
Sep. 28, 2012
Sep. 30, 2011
Net income $ (3,511) $ 13,654 $ 8,937 $ 247 $ (3,200) $ 8,995 $ 7,283 $ (2,944) $ 19,327 $ 10,134 $ 32,644
Less: Undistributed earnings reallocated to non-vested shareholders                 (792) (506) (1,429)
Dilutive earnings                 $ 18,535 $ 9,628 $ 31,215
Dilutive stock options and restricted stock units                 6 8 26
Weighted average common shares - Dilutive                 9,523 9,379 9,287
Class A [Member]
                      
Weighted average common shares - Basic                 8,305 8,155 8,045
Net income per common share - Basic                 $ 1.98 $ 1.04 $ 3.40
Net income per common share - Diluted                 $ 1.95 $ 1.03 $ 3.36
Class B [Member]
                      
Weighted average common shares - Basic                 1,212 1,216 1,216
Net income per common share - Basic                 $ 1.79 $ 0.94 $ 3.07
Net income per common share - Diluted                 $ 1.95 $ 1.03 $ 3.36