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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Earnings for basic computations                 $ 605,437 $ 481,085 $ 416,664
Weighted-average common shares outstanding for basic computations (in shares)                 137,722,589 140,059,494 141,910,799
Earnings for diluted computations                 $ 605,455 $ 481,092 $ 416,675
Dilutive stock options and restricted stock (in shares)                 980,631 1,178,641 1,245,377
Weighted-average common shares outstanding for diluted computations (in shares)                 138,703,220 141,238,135 143,156,176
Earnings per share of common stock                      
Basic (in dollars per share) $ 1.45 $ 1.04 $ 0.98 $ 0.93 $ 0.99 $ 0.79 $ 0.81 $ 0.83 $ 4.40 $ 3.43 $ 2.94
Diluted (in dollars per share) $ 1.43 $ 1.03 $ 0.98 $ 0.92 $ 0.98 $ 0.79 $ 0.80 $ 0.83 $ 4.37 $ 3.41 $ 2.91
Cash dividends paid                 $ 181,066 $ 146,602 $ 114,234
Restricted Stock                      
Earnings per share of common stock                      
Unvested shares participating in the payment of the Company's dividends declared                 800,000 400,000 600,000
Cash dividends paid                 $ 1,000 $ 700 $ 600
Undistributed earnings (loss) allocated to participating securities, basic                 2,500 900 1,200
Undistributed earnings (loss) allocated to participating securities, diluted                 $ 2,500 $ 900 $ 1,200
Stock Options                      
Earnings per share of common stock                      
Antidilutive options excluded from the computation of EPS (in shares)                 30,000.00 200,000 200,000