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Summary of Nonvested Stock Awards and RSU Activity (Detail) (Restricted Stock and Restricted Stock Units, USD $)
9 Months Ended
Oct. 29, 2011
Restricted Stock and Restricted Stock Units
 
Number of Shares  
Beginning Balance 2,367,214
Granted 681,447
Vested (1,098,089)
Forfeited (398,835)
Ending Balance 1,551,737
Weighted Average Grant Date Fair Value per Share  
Beginning Balance $ 11.34
Granted $ 5.64
Vested $ 12.23
Forfeited $ 7.81
Ending Balance $ 9.11