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Net Income per Common Share (Tables) | 6 Months Ended
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Jul. 31, 2013
Reconciliation of Weighted Average Shares Outstanding Used For Computation of Basic and Diluted Net Income Per Common Share | The following is a reconciliation of the weighted-average 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, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Basic weighted-average common shares outstanding. |  |  | 147,038,073 |  |  |  | 144,817,752 |  |  |  | 146,670,110 |  |  |  | 144,764,072 |
Effect of dilutive options, stock appreciation rights, restricted stock units and performance stock units |  |  | 2,323,059 |  |  |  | 797,054 |  |  |  | 2,416,182 |  |  |  | 828,261 |
Diluted weighted-average shares outstanding |  |  | 149,361,132 |  |  |  | 145,614,806 |  |  |  | 149,086,292 |  |  |  | 145,592,333 |

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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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