Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($)		12 Months Ended
		Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016
Opening Balance		$ 359,000	$ 571,000	$ 304,000
Charged to Expense		259,000	122,000	525,000
Deductions	[1]	218,000	334,000	258,000
Closing Balance		$ 400,000	$ 359,000	$ 571,000

[1] Write-offs of uncollectible accounts receivable.