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Net Income per Common Share (Tables) | 6 Months Ended
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Jul. 31, 2015
Reconciliation of Weighted Average Common Shares Outstanding Used For Computation of Basic and Diluted Net Income Per Common Share | The following is a reconciliation of the weighted-average common shares outstanding used for the computation of basic and diluted net income per common share:
|  | Three Months Ended July 31, |  |  | Six Months Ended July 31, |
|  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Basic weighted-average common shares outstanding |  |  | 127,910,026 |  |  |  | 136,453,663 |  |  |  | 129,529,108 |  |  |  | 140,201,489 |
Effect of dilutive options, stock appreciation rights, performance stock units and restricted stock units |  |  | 1,170,568 |  |  |  | 1,723,447 |  |  |  | 1,401,985 |  |  |  | 1,777,162 |
Diluted weighted-average shares outstanding |  |  | 129,080,594 |  |  |  | 138,177,110 |  |  |  | 130,931,093 |  |  |  | 141,978,651 |

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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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