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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

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