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Note 8 - Postretirement and Postemployment Benefits - Assumptions (Details) - Other Postretirement Benefits Plan [Member]
 12 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 30, 2018
Discount rate 2.70% 2.80%  
Expected long-term return on plan assets 4.50% 4.50%  
Discount rate - service cost 3.40% 4.00% 3.40%
Discount rate - interest cost 2.80% 3.70% 2.80%
Expected long-term return on plan assets 4.50% 4.50% 4.50%