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Net Income per Common Share | 6 Months Ended
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Jul. 31, 2013
Net Income per Common Share | 8. 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 |
For the three months ended July 31, 2013 and 2012, awards to purchase 100,000 and 4,529,300 common shares, respectively, were outstanding but were not included in the Company’s computation of diluted weighted-average shares outstanding because their effect would have been anti-dilutive. Awards to purchase 50,000 and 4,352,475 common shares were outstanding for the six months ended July 31, 2013 and 2012, respectively, but were not included in the Company’s computation of diluted weighted-average shares outstanding because their effect would have been anti-dilutive. Excluded from the calculation of diluted net income per common share as of July 31, 2013 and July 31, 2012, were 377,100 and 2,775,740 performance-based equity awards, respectively, since they did not meet the required performance criteria.

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