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Note 8 - Pension Plans - Benefit Obligations and Plan Assets (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Sep. 26, 2021
Sep. 27, 2020
Sep. 29, 2019
Benefit obligation, beginning of year $ 401,381 $ 192,369  
Business combination 0 195,834  
Service cost 2,529 1,361 $ 36
Interest cost 7,147 7,577 6,563
Actuarial loss (gain) (5,413) 20,525  
Benefits paid (21,182) (16,246)  
Administrative expenses paid (275) (39)  
Benefit obligation, end of year 384,187 401,381 192,369
Fair value of plan assets, beginning of year: 331,354 146,999  
Business combination 0 152,331  
Actual return on plan assets 89,892 44,933  
Benefits paid (21,182) (16,246)  
Administrative expenses paid (2,599) (2,794)  
Employer contributions 965 6,131  
Fair value of plan assets, end of year 398,430 331,354 $ 146,999
Funded status $ 14,243 $ (70,027)