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Net Income per Common Share | 6 Months Ended
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Jul. 31, 2018
Earnings Per Share [Abstract] |
Net Income per Common Share | 11. 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 |
For the three months ended July 31, 2018 and 2017, awards to purchase 240,000 common shares ranging in price from $46.02 to $46.42 and 481,075 common shares ranging in price from $28.10 to $46.02, respectively, were excluded from the calculation of diluted net income per common share because the impact would be anti-dilutive. For the six months ended July 31, 2018 and 2017, awards to purchase 253,750 common shares ranging in price from $37.02 to $46.42 and 1,045,275 common shares ranging in price from $25.60 to $46.02, respectively, were excluded from the calculation of diluted net income per common share because the impact would be anti-dilutive. Excluded from the calculation of diluted net income per common share as of July 31, 2018 and 2017 were 1,451,382 and 2,773,059 performance-based equity awards, respectively, because they did not meet the required performance criteria.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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