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SEGMENTS OF BUSINESS (Schedule Of Operations By Geographic Area) (Details) - USD ($)
$ 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
Schedule of Revenues from External Customers and Long-Lived Assets [Table]                      
Net sales: $ 105,874 $ 172,472 $ 175,856 $ 138,644 $ 96,345 $ 187,047 $ 202,115 $ 178,337 $ 592,846 $ 663,844 $ 743,355
Total assets: 635,212       681,606       635,212 681,606  
Long-term assets: 183,063       204,599       183,063 204,599  
United States:                      
Schedule of Revenues from External Customers and Long-Lived Assets [Table]                      
Total assets: 520,834       565,402       520,834 565,402  
Long-term assets: 174,106       188,073       174,106 188,073  
Europe:                      
Schedule of Revenues from External Customers and Long-Lived Assets [Table]                      
Total assets: 52,486       44,360       52,486 44,360  
Long-term assets: 6,468       6,578       6,468 6,578  
Canada and other                      
Schedule of Revenues from External Customers and Long-Lived Assets [Table]                      
Total assets: 61,892       71,844       61,892 71,844  
Long-term assets: $ 2,489       $ 9,948       2,489 9,948  
Unaffiliated customers | United States:                      
Schedule of Revenues from External Customers and Long-Lived Assets [Table]                      
Net sales:                 513,978 569,383 649,867
Unaffiliated customers | Europe:                      
Schedule of Revenues from External Customers and Long-Lived Assets [Table]                      
Net sales:                 34,406 39,155 34,427
Unaffiliated customers | Canada:                      
Schedule of Revenues from External Customers and Long-Lived Assets [Table]                      
Net sales:                 31,502 39,465 44,635
Unaffiliated customers | Other:                      
Schedule of Revenues from External Customers and Long-Lived Assets [Table]                      
Net sales:                 12,959 15,841 14,425
Interunit transfers                      
Schedule of Revenues from External Customers and Long-Lived Assets [Table]                      
Net sales:                 (29,563) (43,757) (46,337)
Interunit transfers | United States:                      
Schedule of Revenues from External Customers and Long-Lived Assets [Table]                      
Net sales:                 20,958 33,873 34,212
Interunit transfers | Europe:                      
Schedule of Revenues from External Customers and Long-Lived Assets [Table]                      
Net sales:                 8,456 9,866 12,109
Interunit transfers | Canada:                      
Schedule of Revenues from External Customers and Long-Lived Assets [Table]                      
Net sales:                 93 0 0
Interunit transfers | Other:                      
Schedule of Revenues from External Customers and Long-Lived Assets [Table]                      
Net sales:                 $ 57 $ 18 $ 17