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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. 27, 2024
Jun. 28, 2024
Mar. 29, 2024
Dec. 29, 2023
Sep. 29, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 30, 2022
Sep. 27, 2024
Sep. 29, 2023
Sep. 30, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net (loss) income $ (34,266) $ 1,622 $ 2,156 $ 3,955 $ (16,007) $ 14,801 $ 14,861 $ 5,879 $ (26,533) $ 19,534 $ 44,491
Less: Undistributed loss (earnings) reallocated to non-vested shareholders                 0 (122) (174)
Net (loss) income per common share - basic                 (26,533) 19,412 44,317
Net (loss) income per common share - diluted                 $ (26,533) $ 19,412 $ 44,317
Dilutive stock options and restricted stock units (in shares)                 0 19 30
Weighted average common shares - Dilutive (in shares)                 10,221 10,195 10,151
Class A                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Weighted average common shares - Basic (in shares)                 9,013 8,968 8,913
Net income (loss) per common share - Basic (USD per share) $ (3.35) $ 0.16 $ 0.21 $ 0.39 $ (1.56) $ 1.46 $ 1.47 $ 0.58 $ (2.60) $ 1.93 $ 4.42
Net (loss) income per common share - Diluted (USD per share) (3.35) 0.16 0.21 0.38 (1.56) 1.44 1.45 0.57 $ (2.60) $ 1.90 $ 4.37
Class B                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Weighted average common shares - Basic (in shares)                 1,208 1,208 1,208
Net income (loss) per common share - Basic (USD per share) (3.35) 0.16 0.21 0.35 (1.56) 1.33 1.33 0.53 $ (2.60) $ 1.75 $ 4.02
Net (loss) income per common share - Diluted (USD per share) $ (3.35) $ 0.16 $ 0.21 $ 0.38 $ (1.56) $ 1.44 $ 1.45 $ 0.57 $ (2.60) $ 1.90 $ 4.37