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Note 6 - Pension Plans - Assumptions (Details) - Pension Plan [Member]
12 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 24, 2017
Discount rate 3.10% 4.20%  
Discount rate - service cost 4.20% 3.70% 3.50%
Discount rate - interest cost 3.90% 3.10% 2.80%
Expected long-term return on plan assets 5.50% 5.50% 5.50%