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Non-Vested Stock Option Unit Transactions (Detail) (USD $)
3 Months Ended
May 03, 2014
Number of Shares  
Options Outstanding at End of Period 4,257,239
Non-Vested Options
 
Number of Shares  
Options Outstanding at Beginning of Period 3,527,800
Granted 65,233
Vested (214,917)
Forfeited (7,337)
Options Outstanding at End of Period 3,370,779
Weighted Average Exercise Price Per Shares  
Options Outstanding at Beginning of Period $ 4.13
Granted $ 12.34
Vested $ 2.60
Forfeited $ 2.78
Options Outstanding at End of Period $ 4.56