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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. 27, 2022
Mar. 28, 2021
Mar. 27, 2022
Mar. 28, 2021
Amortization of prior service benefit $ 212 $ (1) $ 212 $ (1)
Amortization of prior service benefit 212 (1) 212 (1)
Pension Plan [Member]        
Service cost for benefits earned during the period 287 633 743 1,266
Interest cost on projected benefit obligation 2,001 1,787 3,938 3,574
Expected return on plan assets (4,535) (4,672) (9,071) (9,344)
Amortization of net loss (687) 1,005 (1,946) 2,009
Curtailment gain 0 0 (1,027) 0
Pension benefit (2,722) (1,248) (7,151) (2,496)
Postretirement Health Coverage [Member]        
Service cost for benefits earned during the period 27 240 54 450
Interest cost on projected benefit obligation 85 239 170 362
Expected return on plan assets (263) (252) (526) (504)
Amortization of net loss (249) (172) (498) (344)
Amortization of prior service benefit (162) (162) (324) (323)
Curtailment gain 0 0 0 (23,830)
Pension benefit (562) (107) (1,124) (24,189)
Amortization of prior service benefit $ (162) $ (162) $ (324) $ (323)