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Earnings Per Share Calculation Basic Diluted Earnings Per Share Voting Non Voting Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share Diluted Other Disclosures [Abstract]      
Net earnings available to common shareholders $ 367,090 $ 628,707 $ 924,472
Undistributed earnings available to common stockholders $ 331,796 $ 596,942 $ 890,747
Basic earnings per share Common Stock   $ 3.04  
Diluted earnings per share Common Stock   $ 3.04  
Common Stock [Member]      
Earnings Per Share Diluted Other Disclosures [Abstract]      
Weighted Average Number Of Shares Outstanding Basic 19,607,788 19,607,788 19,607,788
Percent Weighted Average Shares Outstanding Common Stock 10.00% 10.00% 10.00%
Voting Common Stock dividends declared     $ (19,608)
Non-Voting Common Stock dividends declared $ (35,294) $ (31,765) (14,117)
Undistributed earnings available to common stockholders   $ 59,694  
Undistributed earnings available to common stockholders, participating securities $ 33,180   $ 89,075
Undistributed earnings per share, common stock $ 1.69 $ 3.04 $ 4.54
Dividends declared per share, distributed     1
Basic earnings per share Common Stock 1.69 3.04 5.54
Diluted earnings per share Common Stock $ 1.69 $ 3.04 $ 5.54
Nonvoting Common Stock [Member]      
Earnings Per Share Diluted Other Disclosures [Abstract]      
Weighted Average Number Of Shares Outstanding Basic 176,470,092 176,470,092 176,470,092
Percent Weighted Average Shares Outstanding Common Stock 90.00% 90.00% 90.00%
Voting Common Stock dividends declared     $ (19,608)
Non-Voting Common Stock dividends declared $ (35,294) $ (31,765) (14,117)
Undistributed earnings available to common stockholders, participating securities $ 298,616 $ 537,248 $ 801,672
Undistributed earnings per share, common stock $ 1.69 $ 3.04 $ 4.54
Dividends declared per share, distributed 0.2 0.18 0.08
Basic earnings per share Common Stock 1.89 3.22 4.62
Diluted earnings per share Common Stock $ 1.89 $ 3.22 $ 4.62
Nonvoting Common Stock [Member] | Common Stock [Member]      
Earnings Per Share Diluted Other Disclosures [Abstract]      
Weighted Average Number Of Shares Outstanding Basic 196,077,880 196,077,880 196,077,880