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Net Income per Common Share (Tables) | 6 Months Ended
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Jul. 31, 2018
Earnings Per Share [Abstract] |
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 |  |  | Six Months Ended |
|  | July 31, |  |  | July 31, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Basic weighted-average common shares outstanding |  |  | 108,831,399 |  |  |  | 113,500,381 |  |  |  | 108,663,990 |  |  |  | 114,865,336 |
Effect of dilutive options, stock appreciation rights, performance stock units and restricted stock units |  |  | 1,602,441 |  |  |  | 260,266 |  |  |  | 1,427,596 |  |  |  | 261,641 |
Diluted weighted-average shares outstanding |  |  | 110,433,840 |  |  |  | 113,760,647 |  |  |  | 110,091,586 |  |  |  | 115,126,977 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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