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Stock Option Grant Date Fair Value Estimated Using Black-Scholes Pricing Model (Detail) (Stock Options, USD $)
3 Months Ended
Dec. 28, 2012
Dec. 30, 2011
Stock Options
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected option life   3 years 6 months
Risk-free interest rate   0.60%
Expected volatility   91.00%
Dividend yield    [1]   
Weighted-average grant date fair value per share   $ 3.26
[1] No stock options were granted during the period.