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Note 8 - Postretirement and Postemployment Benefits - Net Period Postretirement Cost (Benefit) Components for Postretirement Plans (Details) - Postemployment Retirement Benefits [Member] - USD ($)
$ in Thousands
 12 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 30, 2018
Service cost for benefits earned during the year $ 500 $ 0 $ 0
Interest cost on projected benefit obligation 869 412 365
Expected return on plan assets (1,060) (1,082) (1,080)
Amortization of net loss (743) (976) (984)
Amortization of prior service benefit (647) (723) (785)
Curtailment gains 0 0 (2,031)
Net periodic postretirement benefit $ (1,081) $ (2,369) $ (4,515)