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Summary Of Significant Accounting Policies (Schedule Of Basic And Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2016
Jul. 01, 2016
Apr. 01, 2016
Jan. 01, 2016
Oct. 02, 2015
Jul. 03, 2015
Apr. 03, 2015
Jan. 02, 2015
Sep. 30, 2016
Oct. 02, 2015
Oct. 03, 2014
Net income $ (2,127) $ 6,841 $ 9,321 $ (534) $ 1,167 $ 9,997 $ 3,646 $ (4,194) $ 13,501 $ 10,616 $ 9,123
Less: Undistributed earnings reallocated to non-vested shareholders                 (258) (191) (304)
Dilutive earnings                 $ 13,243 $ 10,425 $ 8,819
Dilutive stock options and restricted stock units                 16   3
Weighted average common shares - Dilutive                 9,855 9,727 9,635
Class A [Member]                      
Weighted average common shares - Basic                 8,627 8,515 8,420
Net (loss) income per common share - Basic $ (0.21) $ 0.69 $ 0.94 $ (0.05) $ 0.12 $ 1.01 $ 0.37 $ (0.42) $ 1.36 $ 1.08 $ 0.93
Net income per common Class A and B share - Diluted (0.21) 0.68 0.93 (0.05) 0.12 1.00 0.36 (0.42) $ 1.34 $ 1.06 $ 0.90
Class B [Member]                      
Weighted average common shares - Basic                 1,212 1,212 1,212
Net (loss) income per common share - Basic (0.21) 0.63 0.86 (0.05) 0.11 0.92 0.34 (0.42) $ 1.24 $ 0.98 $ 0.84
Net income per common Class A and B share - Diluted $ (0.21) $ 0.68 $ 0.93 $ (0.05) $ 0.12 $ 1.00 $ 0.36 $ (0.42) $ 1.34 $ 1.06 $ 0.90