Note 16 - Allowance for Credit Losses - Valuation and Qualifying Account Information (Details) - USD ($)	12 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 29, 2019
Allowance for Doubtful Accounts Receivable	$ 13,431,000	$ 6,434,000	$ 4,806,000
Additions charged to expense	1,505,000	8,607,000	2,751,000
Deductions from reserves	(8,362,000)	(1,610,000)	(1,123,000)
Allowance for Doubtful Accounts Receivable	$ 6,574,000	$ 13,431,000	$ 6,434,000