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Net Income Per Share (Tables) | 3 Months Ended
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Apr. 30, 2015
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 April 30,
| 2015 |  | 2014
Numerator: |  |  |
Net income | $ | 19.1 |  |  | $ | 28.3 |
Denominator: |  |  |
Denominator for basic net income per share—weighted average shares | 227.2 |  |  | 227.0 |
Effect of dilutive securities | 4.5 |  |  | 4.6 |
Denominator for dilutive net income per share | 231.7 |  |  | 231.6 |
Basic net income per share | $ | 0.08 |  |  | $ | 0.12 |
Diluted net income per share | $ | 0.08 |  |  | $ | 0.12 |

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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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