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Schedule II - Valuation and Qualifying Accounts (Details) - Valuation and Qualifying Accounts - USD ($)
 12 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Allowance for Doubtful Accounts [Member]      
Valuation Allowance [Line Items]      
Opening Balance $ 450,000 $ 854,000 $ 987,000
Charged to Expense 310,000 161,000 (70,000)
Deductions [1] 456,000 565,000 63,000
Closing Balance 304,000 450,000 854,000
Inventory Valuation Reserve [Member]      
Valuation Allowance [Line Items]      
Opening Balance 3,982,000 4,449,000 3,883,000
Charged to Expense 3,771,000 2,626,000 2,768,000
Deductions [2] 5,126,000 3,093,000 2,202,000
Closing Balance $ 2,627,000 $ 3,982,000 $ 4,449,000
[1] Write-offs of uncollectible accounts receivable.
[2] Disposals and write-offs of obsolete inventory.