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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. 28, 2018
Jun. 29, 2018
Mar. 30, 2018
Dec. 29, 2017
Sep. 29, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 30, 2016
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Net income $ (4,956) $ 23,770 $ 21,620 $ 235 $ 589 $ 16,553 $ 13,959 $ 4,056 $ 40,669 $ 35,157 $ 13,501
Less: Undistributed earnings reallocated to non-vested shareholders                 (224) (375) (258)
Dilutive earnings                 $ 40,445 $ 34,782 $ 13,243
Dilutive stock options and restricted stock units (shares)                 54 33 16
Weighted average common shares - Dilutive (shares)                 9,996 9,920 9,855
Class A                      
Weighted average common shares - Basic (shares)                 8,730 8,675 8,627
Net income per common share - Basic (USD per share) $ (0.50) $ 2.40 $ 2.19 $ 0.02 $ 0.06 $ 1.68 $ 1.41 $ 0.41 $ 4.12 $ 3.56 $ 1.36
Net income per common share - Diluted (USD per share) (0.49) 2.37 2.15 0.02 0.06 1.65 1.39 0.40 $ 4.05 $ 3.51 $ 1.34
Class B                      
Weighted average common shares - Basic (shares)                 1,212 1,212 1,212
Net income per common share - Basic (USD per share) (0.46) 2.19 1.99 0.02 0.05 1.52 1.28 0.37 $ 3.74 $ 3.23 $ 1.24
Net income per common share - Diluted (USD per share) $ (0.49) $ 2.37 $ 2.15 $ 0.02 $ 0.06 $ 1.65 $ 1.39 $ 0.40 $ 4.05 $ 3.51 $ 1.34