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Fair Value Measurements (Details 2) (USD $) |  |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2014 | Feb. 01, 2014 | Feb. 01, 2014 Corporate bonds Short-term investments and other assets | May 03, 2014 Marketable equity securities | Nov. 01, 2014 Marketable equity securities | Feb. 01, 2014 Marketable equity securities Short-term investments and other assets | May 03, 2014 Marketable equity securities Other income/expense | Nov. 01, 2014 Marketable equity securities Other income/expense
Available-for-sale securities |  |  |  |  |  |  |  |
Available-for-sale securities, included in short-term investments and other assets depending on their respective maturity dates |  |  | $ 5,100,000 |  |  | $ 600,000 |  |
Proceeds from sale of available-for-sale securities |  |  |  | 600,000 | 600,000 |  |  |
Gains recognized on sale of available-for-sale securities |  |  |  |  |  |  | 100,000 | 100,000
Accumulated unrealized gains (losses), net of tax, included in accumulated other comprehensive income (loss) | $ 0 | $ 103,000 |  |  |  |  |  |

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