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Weighted-Average Shares - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 29, 2013
Sep. 29, 2013
Sep. 30, 2012
Sep. 29, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]          
Stock split conversion ratio 2 2   2  
Stock options to purchase anti-dilutive common stock   76,653 1,870,684 1,357,004 1,784,698