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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings for basic computations [1] $ 69,148 $ 54,978 $ 218,300 $ 184,245
Earnings for diluted computations [1] $ 69,152 $ 54,983 $ 218,316 $ 184,264
Dilutive stock options and restricted stock 1,628,250 1,927,866 1,866,357 2,170,807
Earnings per common share, Basic $ 0.48 $ 0.37 $ 1.49 $ 1.25
Earnings per common share, Diluted $ 0.47 $ 0.37 $ 1.47 $ 1.23
Unvested shares, cash dividends paid     $ 75,748 $ 67,311
Restricted stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Unvested shares participating in the payment of the Company's dividends declared 1,300,000 1,700,000 1,300,000 1,700,000
Unvested shares, cash dividends paid $ 200 $ 200 $ 600 $ 700
Undistributed earnings allocated to participating securities, basic 400 400 1,300 1,300
Undistributed earnings allocated to participating securities, diluted $ 400 $ 400 $ 1,300 $ 1,300
Stock options        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Antidilutive options excluded from the computation of EPS 400,000 40,000 300,000 40,000
Common stock, Class A        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Weighted-average common shares outstanding for basic computations 144,942,367 148,679,393 146,580,891 147,973,044
Weighted-average common shares outstanding for diluted computations 146,570,617 150,607,259 148,447,248 150,143,851
[1] (1) During the three months ended December 31, 2017 and 2016, approximately 1.3 million and 1.7 million participating securities, respectively, were paid dividends totaling $0.2 million in each period. During the nine months ended December 31, 2017 and 2016, approximately 1.3 million and 1.7 million participating securities, respectively, were paid dividends totaling $0.6 million and $0.7 million, respectively. For the three and nine months ended December 31, 2017, there were undistributed earnings of $0.4 million and $1.3 million, respectively, allocated to the participating class of securities in both basic and diluted EPS. For the three and nine months ended December 31, 2016, there were undistributed earnings of $0.4 million and $1.3 million, respectively, allocated to the participating class of securities in both basic and diluted EPS. The allocated undistributed earnings and the dividends paid comprise the difference between net income presented on the condensed consolidated statements of operations and earnings for basic and diluted computations for the three and nine months ended December 31, 2017 and 2016.