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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings for basic computations $ 92,127 $ 72,966 $ 195,681 $ 142,974
Earnings for diluted computations $ 92,130 $ 72,971 $ 195,690 $ 142,986
Dilutive stock options and restricted stock (in shares) 1,265,851 1,802,183 1,353,582 1,976,722
Earnings per common share        
Basic (in dollars per share) $ 0.65 $ 0.50 $ 1.37 $ 0.97
Diluted (in dollars per share) $ 0.64 $ 0.49 $ 1.36 $ 0.96
Unvested shares, cash dividends paid     $ 54,660 $ 50,866
Restricted stock        
Earnings per common share        
Unvested shares participating in the payment of the Company's dividends declared 900,000 1,400,000 900,000 1,400,000
Unvested shares, cash dividends paid $ 200 $ 200 $ 300 $ 400
Undistributed earnings allocated to participating securities, basic 400 400 900 900
Undistributed earnings allocated to participating securities, diluted $ 400 $ 400 $ 900 $ 900
Stock options        
Earnings per common share        
Antidilutive options excluded from the computation of EPS 200,000 400,000 200,000 300,000
Class A Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Weighted-average common shares outstanding for basic computations 142,443,058 147,085,314 142,861,491 147,400,153
Weighted-average common shares outstanding for diluted computations 143,708,909 148,887,497 144,215,073 149,376,875