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Net Income Per Share (Tables) | 9 Months Ended
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Oct. 31, 2014
Earnings Per Share [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share | The following table sets forth the computation of the numerators and denominators used in the basic and diluted net income per share amounts:
| Three Months Ended October 31, |  | Nine Months Ended October 31,
| 2014 |  | 2013 |  | 2014 |  | 2013
Numerator: |  |  |  |  |  |  |
Net income | $ | 10.7 |  |  | $ | 57.6 |  |  | $ | 70.3 |  |  | $ | 174.9 |
Denominator: |  |  |  |  |  |  |
Denominator for basic net income per share—weighted average shares | 226.9 |  |  | 223.1 |  |  | 227.1 |  |  | 223.4 |
Effect of dilutive securities | 4.6 |  |  | 4.6 |  |  | 4.8 |  |  | 5.2 |
Denominator for dilutive net income per share | 231.5 |  |  | 227.7 |  |  | 231.9 |  |  | 228.6 |
Basic net income per share | $ | 0.05 |  |  | $ | 0.26 |  |  | $ | 0.31 |  |  | $ | 0.78 |
Diluted net income per share | $ | 0.05 |  |  | $ | 0.25 |  |  | $ | 0.30 |  |  | $ | 0.77 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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