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Consolidated Statements of Shareholders' Equity Consolidated Statements of Shareholders' Equity - 6 months ended Oct. 31, 2017 - USD ($)
$ in Thousands
Total
Common stock
Retained earnings
Beginning Balance (shares) at Apr. 30, 2017   38,765,821,000  
Beginning Balance at Apr. 30, 2017 $ 1,190,620 $ 40,074 $ 1,150,546
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income 105,676    
Dividends declared (19,709)   (19,709)
Exercise of stock options (shares)   10,225,000  
Exercise of stock options $ 298 $ 298  
Repurchase of common stock (shares) (1,228,562,000)    
Repurchase of common stock $ (133,188) $ (51,007) (82,181)
Stock based compensation (shares)   65,337,000  
Stock based compensation 10,635 $ 10,635  
Ending Balance (shares) at Oct. 31, 2017   37,612,821,000  
Ending Balance at Oct. 31, 2017 $ 1,154,332 $ 0 $ 1,154,332