Note 7 - Pension Plans - Assumptions (Details) - Pension Plan [Member]	12 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 30, 2018
Discount rate	2.80%	3.10%
Discount rate - service cost	3.30%	4.20%	3.70%
Discount rate - interest cost	2.60%	3.90%	3.10%
Expected long-term return on plan assets	6.00%	5.50%	5.50%