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Schedule II - Valuation and Qualifying Accounts (Detail) - Valuation and Qualifying Accounts (USD $)
 12 Months Ended
Sep. 29, 2012
Sep. 24, 2011
Sep. 25, 2010
Allowance for Doubtful Accounts [Member]
      
Opening balance $ 653,000 $ 591,000 $ 623,000
Charged to expense 276,000 423,000 493,000
Deductions 244,000 [1] 361,000 [1] 525,000 [1]
Closing balance 685,000 653,000 591,000
Inventory Valuation Reserve [Member]
      
Opening balance 4,615,000 4,189,000 4,209,000
Charged to expense 1,291,000 1,931,000 1,509,000
Deductions 2,023,000 [2] 1,505,000 [2] 1,529,000 [2]
Closing balance $ 3,883,000 $ 4,615,000 $ 4,189,000
[1] Write-off of uncollectible accounts receivable.
[2] Disposals of obsolete inventory.