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Related Party Transactions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 30, 2012
Jan. 01, 2012
Related Party Transaction [Line Items]    
Services Agreement advance written notice period for termination 30 days  
Expenses related to Services Agreement $ 0.3  
Reimbursement of Harbinger Capital expenses   0.7
Repurchase of registered secondary offering which is owned by the Principal Stockholders 20.0  
Registration Rights Agreement [Member]
    
Related Party Transaction [Line Items]    
Repurchase of registered secondary offering which is owned by the Principal Stockholders   23.0
Offering cost incurred by company   $ 0.4