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Summary of Restricted Stock Unit Activity (Detail) (Restricted Stock Units (RSUs))
3 Months Ended
May 05, 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 815,705
Released, shares (260,913)
Cancelled, shares (45,261)
Balance at May 5, 2013, shares 3,281,957
Vested plus expected to vest at May 5, 2013, shares 2,239,606