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Summary of Restricted Stock Unit Activity (Detail) (Restricted Stock Units (RSUs))
3 Months Ended
May 04, 2014
Restricted Stock Units (RSUs)
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Balance at February 2, 2014, shares 3,079,651
Granted, shares 843,514
Released, shares (1,365,615)
Cancelled, shares (49,475)
Balance at May 4, 2014, shares 2,508,075
Vested plus expected to vest at May 4, 2014, shares 1,627,500