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Summary of Restricted Stock Unit Activity (Detail) (Restricted Stock Units (RSUs))
6 Months Ended
Aug. 04, 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 855,736
Released, shares (306,164)
Cancelled, shares (89,747)
Balance at August 4, 2013, shares 3,232,251
Vested plus expected to vest at August 4, 2013, shares 2,212,051