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Net Income (Loss) per Common Share (Tables) | 6 Months Ended
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Jul. 31, 2020
Earnings Per Share [Abstract] |
Reconciliation of Weighted Average Common Shares Outstanding Used for Computation of Basic and Diluted Net Income (Loss) 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 (loss) per common share:
|  | Three Months Ended |  |  | Six Months Ended |
|  | July 31, |  |  | July 31, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Basic weighted-average common shares outstanding |  |  | 97,778,749 |  |  |  | 99,095,562 |  |  |  | 97,843,796 |  |  |  | 101,722,244 |
Effect of dilutive options, performance stock units and restricted stock units |  |  | 326,169 |  |  |  | 506,903 |  |  |  | — |  |  |  | 704,796 |
Diluted weighted-average shares outstanding |  |  | 98,104,918 |  |  |  | 99,602,465 |  |  |  | 97,843,796 |  |  |  | 102,427,040 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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