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Note 15 - Allowance for Doubtful Accounts - Valuation and Qualifying Account Information (Details) - USD ($)
12 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 30, 2018
Allowance for Doubtful Accounts Receivable $ 6,434,000 $ 4,806,000 $ 4,796,000
Additions charged to expense 8,607,000 2,751,000 1,952,000
Deductions from reserves (1,610,000) (1,123,000) (1,942,000)
Allowance for Doubtful Accounts Receivable $ 13,431,000 $ 6,434,000 $ 4,806,000