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Net Income Per Common Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Basic |  |  |  |  |  |  |  |  |  |  |
Net income | $ 41,343 | $ 39,319 | $ 49,869 | $ 50,097 | $ 20,932 | $ 12,663 | $ 39,430 | $ 53,795 | $ 180,628 | $ 126,820 | $ 103,814
Weighted average shares outstanding-basic |  |  |  |  |  |  |  |  | 38,743,227 | 38,457,680 | 38,297,083
Basic earnings per common share (in Dollars per share) | $ 1.06 | $ 1.01 | $ 1.29 | $ 1.30 | $ 0.54 | $ 0.33 | $ 1.03 | $ 1.40 | $ 4.66 | $ 3.30 | $ 2.71
Diluted |  |  |  |  |  |  |  |  |  |  |
Plus effect of stock options and restricted stock units |  |  |  |  |  |  |  |  | 360,606 | 410,726 | 322,993
Weighted-average shares outstanding-diluted |  |  |  |  |  |  |  |  | 39,103,833 | 38,868,406 | 38,620,076
Diluted earnings per common share (in Dollars per share) | $ 1.05 | $ 1.01 | $ 1.28 | $ 1.28 | $ 0.54 | $ 0.33 | $ 1.01 | $ 1.39 | $ 4.62 | $ 3.26 | $ 2.69

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