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Net Income Per Common Share (Tables)
 12 Months Ended
Apr. 30, 2017
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,
 
2017
 
2016
 
2015
Basic
 
 
 
 
 
Net income
$
177,485

 
$
225,982

 
$
180,628

Weighted average shares outstanding-basic
39,124,665

 
39,016,299

 
38,743,227

Basic earnings per common share
$
4.54

 
$
5.79

 
$
4.66

Diluted

 

 

Net income
$
177,485

 
$
225,982

 
$
180,628

Weighted-average shares outstanding-basic
39,124,665

 
39,016,299

 
38,743,227

Plus effect of stock options and restricted stock units
454,333

 
405,900

 
360,606

Weighted-average shares outstanding-diluted
39,578,998

 
39,422,199

 
39,103,833

Diluted earnings per common share
$
4.48

 
$
5.73

 
$
4.62