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Note 6 - Pension, Postretirement and Postemployment Defined Benefit Plans - Net Periodic Cost (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Pension Plan [Member]    
Service cost for benefits earned during the period $ 633 $ 8
Interest cost on projected benefit obligation 1,787 1,231
Expected return on plan assets (4,672) (1,951)
Amortization of net loss 1,004 792
Amortization of prior service benefit 0 (2)
Pension benefit (1,248) 78
Postretirement Health Coverage [Member]    
Service cost for benefits earned during the period 210 0
Interest cost on projected benefit obligation 123 67
Expected return on plan assets (252) (265)
Amortization of net loss (172) (186)
Amortization of prior service benefit (161) (161)
Pension benefit (24,082) (545)
Curtailment gain $ (23,830) $ 0