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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. 28, 2012
Jun. 29, 2012
Mar. 30, 2012
Dec. 30, 2011
Sep. 30, 2011
Jul. 01, 2011
Apr. 01, 2011
Dec. 31, 2010
Oct. 01, 2010
Jul. 02, 2010
Apr. 02, 2010
Jan. 01, 2010
Sep. 28, 2012
Sep. 30, 2011
Oct. 01, 2010
Net income $ (3,200) $ 8,995 $ 7,283 $ (2,944) $ 17,277 $ 8,118 $ 8,486 $ (1,237) $ (5,840) $ 10,432 $ 6,183 $ (4,236) $ 10,134 $ 32,644 $ 6,539
Less: Undistributed earnings reallocated to non-vested shareholders                         (506) (1,429) (201)
Dilutive earnings                         $ 9,628 $ 31,215 $ 6,338
Dilutive stock options                         8 26 42
Weighted average common shares - Dilutive                         9,379 9,287 9,267
Class A [Member]
                              
Weighted average common shares - Basic                         8,155 8,045 8,008
Net income per common share - Basic                         $ 1.04 $ 3.40 $ 0.69
Net income per common share - Diluted                         $ 1.03 $ 3.36 $ 0.68
Class B [Member]
                              
Weighted average common shares - Basic                         1,216 1,216 1,217
Net income per common share - Basic                         $ 0.94 $ 3.07 $ 0.63
Net income per common share - Diluted                         $ 1.03 $ 3.36 $ 0.68