Net Income Per Common Share (Tables)

12 Months Ended

Apr. 30, 2015

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Earnings Per Share

Computations for basic and diluted earnings per common share are presented below:

	Years ended April 30,
	2015		2014		2013
Basic
Net income	$	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	$	4.66	$	3.30	$	2.71
Diluted
Net income	$	180,628	$	126,820	$	103,814
Weighted-average shares outstanding-basic	38,743,227		38,457,680		38,297,083
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	$	4.62	$	3.26	$	2.69