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Fair Value Measurements (Details 2) (USD $) | 9 Months Ended |
--- | --- | ---
Oct. 27, 2012 | Oct. 29, 2011 | Oct. 27, 2012 Corporate bonds | Jan. 28, 2012 Corporate bonds
Held-to-maturity securities |  |  |  |
Amortized cost of held-to-maturity securities |  |  |  | $ 4,100,000
Held-to-maturity securities | $ 4,000,000 | $ 15,000,000 | $ 4,000,000 |

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