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Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($)
12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Opening Balance $ 571,000 $ 304,000 $ 450,000
Charged to Expense 122,000 525,000 310,000
Deductions [1] 334,000 258,000 456,000
Closing Balance $ 359,000 $ 571,000 $ 304,000
[1] Write-offs of uncollectible accounts receivable.