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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
Oct. 01, 2021
Jul. 02, 2021
Apr. 02, 2021
Jan. 01, 2021
Oct. 02, 2020
Jun. 26, 2020
Mar. 27, 2020
Dec. 27, 2019
Oct. 01, 2021
Oct. 02, 2020
Sep. 27, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net income $ 6,926 $ 28,774 $ 27,834 $ 19,847 $ 15,547 $ 12,869 $ 20,387 $ 6,430 $ 83,381 $ 55,233 $ 51,413
Less: Undistributed earnings reallocated to non-vested shareholders                 (320) (220) (226)
Dilutive earnings                 $ 83,061 $ 55,013 $ 51,187
Dilutive stock options and restricted stock units (shares)                 44 30 27
Weighted average common shares - Dilutive (shares)                 10,120 10,064 10,021
Class A                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Weighted average common shares - Basic (shares)                 8,864 8,822 8,782
Net income per common share - Basic (USD per share) $ 0.70 $ 2.87 $ 2.78 $ 1.99 $ 1.56 $ 1.29 $ 2.05 $ 0.65 $ 8.34 $ 5.54 $ 5.18
Net income per common share - Diluted (USD per share) 0.68 2.83 2.74 1.96 1.53 1.27 2.02 0.64 $ 8.21 $ 5.47 $ 5.11
Class B                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Weighted average common shares - Basic (shares)                 1,212 1,212 1,212
Net income per common share - Basic (USD per share) 0.62 2.61 2.53 1.81 1.42 1.17 1.86 0.59 $ 7.57 $ 5.04 $ 4.71
Net income per common share - Diluted (USD per share) $ 0.68 $ 2.83 $ 2.74 $ 1.96 $ 1.53 $ 1.27 $ 2.02 $ 0.64 $ 8.21 $ 5.47 $ 5.11