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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. 26, 2021
Dec. 27, 2020
Pension Plan [Member]    
Service cost for benefits earned during the period $ 456 $ 633
Interest cost on projected benefit obligation 1,936 1,787
Expected return on plan assets (4,536) (4,672)
Amortization of net (gain) loss (1,259) 1,004
Curtailment gain (1,027) 0
Pension benefit (4,430) (1,248)
Postretirement Health Coverage [Member]    
Service cost for benefits earned during the period 27 210
Interest cost on projected benefit obligation 85 123
Expected return on plan assets (263) (252)
Amortization of net (gain) loss (249) (172)
Curtailment gain 0 (23,830)
Pension benefit (562) (24,082)
Amortization of prior service benefit $ (162) $ (161)