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Commitments and Contingencies - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Dec. 28, 2012
Defendant
Sep. 28, 2012
Contingencies And Commitments [Line Items]    
Obligation to reimburse for lease incentives $ 1,000,000  
Operating leases, expiration period Jan. 31, 2018  
Outstanding unused letters of credit from a bank 246,000 246,000
Outstanding noncancelable purchase commitments $ 5,100,000 $ 6,300,000
Ex-Employee defendants 5  
Number of plaintiff's claims, voluntarily dismissed 2