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Note 6 - Pension, Postretirement and Postemployment Defined Benefit Plans - Net Periodic Cost (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Mar. 28, 2021
Mar. 29, 2020
Pension Plan [Member]        
Service cost for benefits earned during the period $ 633 $ 103 $ 1,266 $ 111
Interest cost on projected benefit obligation 1,787 1,420 3,574 2,651
Expected return on plan assets (4,672) (2,321) (9,344) (4,272)
Amortization of net loss 1,005 792 2,009 1,584
Amortization of prior service benefit (1) (2) (1) (4)
Pension benefit (1,248) (8) (2,496) 70
Postretirement Health Coverage [Member]        
Service cost for benefits earned during the period 240 36 450 36
Interest cost on projected benefit obligation 239 110 362 177
Expected return on plan assets (252) (265) (504) (530)
Amortization of net loss (172) (186) (344) (372)
Amortization of prior service benefit (162) (161) (323) (322)
Pension benefit (107) (466) (24,189) (1,011)
Curtailment gain $ 0 $ 0 $ (23,830) $ 0