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Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs) - USD ($)
 12 Months Ended
Jan. 31, 2016
Feb. 01, 2015
Feb. 02, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Balance at February 1, 2015, shares 2,313,477    
Granted, shares 821,072    
Released, shares (656,452)    
Cancelled, shares (189,139)    
Balance at January 31, 2016, shares 2,288,958 2,313,477  
Vested plus expected to vest at January 31, 2016, shares 1,436,810    
Balance at February 1, 2015, weighted average grant date fair value $ 52.47    
Granted, weighted average grant date fair value 76.19 $ 63.18 $ 53.59
Released, weighted average grant date fair value 51.34    
Cancelled, weighted average grant date fair value 57.45    
Balance at January 31, 2016, weighted average grant date fair value 60.89 $ 52.47  
Vested plus expected to vest at January 31, 2016, weighted average grant date fair value $ 61.20    
Weighted average contractual term remaining (years) 2 years 6 months    
Vested plus expected to vest at February 1, 2015, weighted average contractual term remaining (years) 2 years 4 months 6 days    
Balance at January 31, 2016 [1] $ 118,248,000    
Vested plus expected to vest at January 31, 2016 [1] $ 74,226,000    
[1] Intrinsic value for outstanding and unvested restricted stock units is based on the market value of our common stock on the last business day of the fiscal year (or $51.66).