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Earnings Per Share (Details) (USD $)
3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings for basic computations $ 62,791,000 $ 67,145,000 $ 133,715,000 $ 136,829,000
Weighted-average common shares outstanding for basic computations 145,502,291 141,104,943 144,581,165 139,574,725
Earnings for diluted computations 62,791,000 67,171,000 133,715,000 136,885,000
Dilutive stock options and restricted stock 4,901,605 7,400,883 4,956,395 7,682,849
Average number of common shares outstanding for diluted computations 150,403,896 148,505,826 149,537,560 147,257,574
Earnings per common share, Basic $ 0.43 $ 0.48 $ 0.92 $ 0.98
Earnings per common share, Diluted $ 0.42 $ 0.45 $ 0.89 $ 0.93
Unvested shares, cash dividends paid     46,797,000 47,908,000
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 2,200,000 1,400,000 2,200,000 1,400,000
Unvested shares, cash dividends paid 2,500,000 140,000 2,700,000 202,000
Undistributed earnings allocated to participating securities, basic 0 528,000 0 1,100,000
Undistributed earnings allocated to participating securities, diluted $ 0 $ 502,000 $ 0 $ 1,000,000
Stock options
       
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Antidilutive options excluded from the computation of EPS 202,000   212,000 890,000
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 144,557,638 139,135,635 143,382,252 137,337,119
Non-voting common stock, Class B
       
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Weighted-average common shares outstanding for basic computations 344,774 967,094 440,760 1,158,003
Restricted common stock, Class C
       
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Weighted-average common shares outstanding for basic computations 599,879 1,002,214 758,153 1,079,603