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Note 6 - Pension, Postretirement and Postemployment Defined Benefit Plans - Net Periodic Cost (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Jun. 27, 2021
Jun. 28, 2020
Pension Plan [Member]        
Service cost for benefits earned during the period $ 633 $ 626 $ 1,899 $ 737
Interest cost on projected benefit obligation 1,787 2,462 5,361 5,113
Expected return on plan assets (4,672) (4,356) (14,016) (8,628)
Amortization of net loss 1,004 792 3,013 2,376
Amortization of prior service benefit 0 (2) (1) (6)
Pension benefit (1,248) (478) (3,744) (408)
Postretirement Health Coverage [Member]        
Service cost for benefits earned during the period 240 232 690 268
Interest cost on projected benefit obligation 239 346 601 523
Expected return on plan assets (252) (265) (756) (795)
Amortization of net loss (172) (186) (516) (558)
Amortization of prior service benefit (162) (161) (485) (483)
Pension benefit (107) (34) (24,296) (1,045)
Curtailment gain $ 0 $ 0 $ (23,830) $ 0