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Summary of Restricted Stock Unit Activity (Detail) (Restricted Stock Units (RSUs))
6 Months Ended
Aug. 03, 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 872,177
Released, shares (1,414,406)
Cancelled, shares (123,562)
Balance at August 3, 2014, shares 2,413,860
Vested plus expected to vest at August 3, 2014, shares 1,570,053