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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. 29, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 30, 2022
Sep. 30, 2022
Jul. 01, 2022
Apr. 01, 2022
Dec. 31, 2021
Sep. 29, 2023
Sep. 30, 2022
Oct. 01, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net income $ (16,007) $ 14,801 $ 14,861 $ 5,879 $ 9,653 $ 14,082 $ 9,900 $ 10,856 $ 19,534 $ 44,491 $ 83,381
Less: Undistributed earnings reallocated to non-vested shareholders                 (122) (174) (320)
Dilutive earnings                 $ 19,412 $ 44,317 $ 83,061
Dilutive stock options and restricted stock units (in shares)                 19 30 44
Weighted average common shares - Dilutive (in shares)                 10,195 10,151 10,120
Class A                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Weighted average common shares - Basic (shares)                 8,968 8,913 8,864
Net income per common share - Basic (USD per share) $ (1.56) $ 1.46 $ 1.47 $ 0.58 $ 0.96 $ 1.40 $ 0.99 $ 1.08 $ 1.93 $ 4.42 $ 8.34
Net income per common share - Diluted (USD per share) (1.56) 1.44 1.45 0.57 0.95 1.38 0.97 1.07 $ 1.90 $ 4.37 $ 8.21
Class B                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Weighted average common shares - Basic (shares)                 1,208 1,208 1,212
Net income per common share - Basic (USD per share) (1.56) 1.33 1.33 0.53 0.87 1.27 0.90 0.98 $ 1.75 $ 4.02 $ 7.57
Net income per common share - Diluted (USD per share) $ (1.56) $ 1.44 $ 1.45 $ 0.57 $ 0.95 $ 1.38 $ 0.97 $ 1.07 $ 1.90 $ 4.37 $ 8.21