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Note 7 - Pension, Postretirement and Postemployment Defined Benefit Plans - Net Periodic Cost (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Pension Plan [Member]        
Service cost for benefits earned during the period $ 626 $ 9 $ 737 $ 27
Interest cost on projected benefit obligation 2,462 1,641 5,113 4,923
Expected return on plan assets (4,356) (2,018) (8,628) (6,055)
Amortization of net loss 792 284 2,376 851
Amortization of prior service benefit (2) (25) (6) (75)
Pension benefit (478) (109) (408) (329)
Postretirement Health Coverage [Member]        
Service cost for benefits earned during the period 232 0 268 0
Interest cost on projected benefit obligation 346 103 523 309
Expected return on plan assets (265) (270) (795) (811)
Amortization of net loss (186) (244) (558) (732)
Amortization of prior service benefit (161) (181) (483) (543)
Pension benefit $ (34) $ (592) $ (1,045) $ (1,777)