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QUARTERLY FINANCIAL SUMMARY (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Oct. 02, 2020
Jun. 26, 2020
Mar. 27, 2020
Dec. 27, 2019
Sep. 27, 2019
Jun. 28, 2019
Mar. 29, 2019
Dec. 28, 2018
Oct. 02, 2020
Sep. 27, 2019
Sep. 28, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net sales $ 164,681 $ 138,390 $ 163,084 $ 128,054 $ 104,019 $ 176,253 $ 177,707 $ 104,440 $ 594,209 $ 562,419 $ 544,268
Gross profit 73,687 62,562 75,132 53,612 46,583 79,725 79,129 44,319 264,993 249,756 241,860
Operating profit (loss) 19,546 12,929 31,794 6,801 1,923 28,029 27,844 5,978 71,070 63,774 63,021
Income (loss) before income taxes 21,179 15,557 28,377 8,589 3,264 28,892 30,020 4,331 73,702 66,507 68,106
Income tax expense 5,632 2,688 7,990 2,159 (639) 6,826 8,097 810 18,469 15,094 27,437
Net income $ 15,547 $ 12,869 $ 20,387 $ 6,430 $ 3,903 $ 22,066 $ 21,923 $ 3,521 $ 55,233 $ 51,413 $ 40,669
Class A                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net income (loss) per common share - Basic (USD per share) $ 1.56 $ 1.29 $ 2.05 $ 0.65 $ 0.49 $ 2.22 $ 2.21 $ 0.36 $ 5.54 $ 5.18 $ 4.12
Net income per common share - Diluted (USD per share) 1.53 1.27 2.02 0.64 0.49 2.19 2.18 0.35 5.47 5.11 4.05
Class B                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net income (loss) per common share - Basic (USD per share) 1.42 1.17 1.86 0.59 0.45 2.02 2.01 0.32 5.04 4.71 3.74
Net income per common share - Diluted (USD per share) $ 1.53 $ 1.27 $ 2.02 $ 0.64 $ 0.49 $ 2.19 $ 2.18 $ 0.35 $ 5.47 $ 5.11 $ 4.05