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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
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12 Months Ended |
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Jan. 31, 2015
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Feb. 01, 2014
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Feb. 02, 2013
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May 18, 2012
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May 21, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options and restricted stock, percent of total outstanding stock |
2.30% |
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| Common stock, percentage increase upon exercise of all outstanding options |
4.80% |
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| Stock options, weighted average grant date fair value |
$ 3.78 |
$ 7.15 |
$ 11.49 |
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| Common Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Closing share price (in dollars per share) |
$ 7.27 |
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| Long-Term Incentive Plan, 2014 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Long-term incentive plan, shares available for future grant |
23,200,000 |
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| Stock Awards [Member] | Long-Term Incentive Plan, 2014 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Long-term incentive plan, shares reserved for future grants |
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16,000,000 |
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| Stock Option Award [Member] | Long-Term Incentive Plan, 2014 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Long-term incentive plan, shares reserved for future grants |
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32,000,000 |
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| Restricted Stock Units (RSUs) [Member] | 2014 Equity Inducement Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Long-term incentive plan, shares reserved for future grants |
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750,000 |
| Stock Options [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unrecognized compensation expense |
$ 11 |
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| Weighted average period over which unrecognized compensation is expected to be recognized (years) |
2 years |
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