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Summary of Restricted Stock Unit Activity (Detail) (Restricted Stock Units (RSUs))
9 Months Ended
Nov. 03, 2013
Restricted Stock Units (RSUs)
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Balance at February 3, 2013, shares 2,772,426
Granted, shares 928,416
Released, shares (364,198)
Cancelled, shares (120,291)
Balance at November 3, 2013, shares 3,216,353
Vested plus expected to vest at November 3, 2013, shares 2,189,311