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Net Income Per Common Share (Tables) | 12 Months Ended
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Jan. 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:
|  | Fiscal Year Ended January 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Basic weighted-average common shares outstanding |  |  | 111,887,308 |  |  |  | 116,873,023 |  |  |  | 125,232,499 |
Effect of dilutive options, stock appreciation rights, restricted stock units and performance stock units |  |  | 480,616 |  |  |  | 418,094 |  |  |  | 780,915 |
Diluted weighted-average shares outstanding |  |  | 112,367,924 |  |  |  | 117,291,117 |  |  |  | 126,013,414 |

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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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