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SEGMENTS OF BUSINESS (Schedule Of Operations By Geographic Area) (Details) - USD ($)
$ 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
Segment Reporting Information [Line Items]                      
Net sales: $ 166,260 $ 213,568 $ 206,156 $ 165,667 $ 164,681 $ 138,390 $ 163,084 $ 128,054 $ 751,651 $ 594,209 $ 562,419
Total assets: 674,287       546,026       674,287 546,026  
Long-term assets: 169,894       146,809       169,894 146,809  
United States:                      
Segment Reporting Information [Line Items]                      
Total assets: 574,916       456,188       574,916 456,188  
Long-term assets: 158,868       134,932       158,868 134,932  
Europe:                      
Segment Reporting Information [Line Items]                      
Total assets: 45,916       45,429       45,916 45,429  
Long-term assets: 8,038       7,889       8,038 7,889  
Canada and other                      
Segment Reporting Information [Line Items]                      
Total assets: 53,455       44,409       53,455 44,409  
Long-term assets: $ 2,988       $ 3,988       2,988 3,988  
Interunit transfers                      
Segment Reporting Information [Line Items]                      
Net sales:                 (40,685) (26,109) (30,812)
Interunit transfers | United States:                      
Segment Reporting Information [Line Items]                      
Net sales:                 30,593 17,503 20,991
Interunit transfers | Europe:                      
Segment Reporting Information [Line Items]                      
Net sales:                 9,974 8,561 9,792
Interunit transfers | Canada:                      
Segment Reporting Information [Line Items]                      
Net sales:                 12 35 0
Interunit transfers | Other:                      
Segment Reporting Information [Line Items]                      
Net sales:                 106 10 29
Operating Segment | United States:                      
Segment Reporting Information [Line Items]                      
Net sales:                 659,330 525,204 482,326
Operating Segment | Europe:                      
Segment Reporting Information [Line Items]                      
Net sales:                 30,509 28,880 35,114
Operating Segment | Canada:                      
Segment Reporting Information [Line Items]                      
Net sales:                 48,867 29,512 30,039
Operating Segment | Other:                      
Segment Reporting Information [Line Items]                      
Net sales:                 $ 12,945 $ 10,613 $ 14,940