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Fair Value Measurements (Details 2) (Corporate bonds, USD $)
In Millions, unless otherwise specified
12 Months Ended
Feb. 02, 2013
Jan. 28, 2012
Corporate bonds
   
Held-to-maturity securities    
Proceeds from maturity of held-to-maturity securities $ 4.0  
Amortized cost of held-to-maturity securities   $ 4.1