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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
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share Diluted Other Disclosures [Abstract]        
Net earnings available to common shareholders $ 273,508 $ 349,866 $ 530,346 $ 688,211
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 19,607,788
Percent Weighted Average Shares Outstanding Common Stock 10.00% 10.00% 10.00% 10.00%
Net earnings available to common shareholders $ 0 $ 0 $ 0 $ 0
Voting Common Stock dividends declared 0 (9,804) 0 (19,608)
Non-Voting Common Stock dividends declared (7,059) 0 (14,118) 0
Non-Voting Common Stock dividends declared (266,449) (340,062) (516,228) (668,603)
Undistributed earnings available to common stockholders, participating securities $ 26,645 $ 34,006 $ 51,623 $ 66,860
Undistributed earnings per share, common stock $ 1.36 $ 1.73 $ 2.63 $ 3.41
Dividends declared per share, distributed 0 0.50 0 1.00
Basic and diluted earnings per share Common Stock $ 1.36 $ 2.23 $ 2.63 $ 4.41
Nonvoting Common Stock [Member]        
Earnings Per Share Diluted Other Disclosures [Abstract]        
Weighted Average Number Of Shares Outstanding Basic 176,470,092 176,470,092 176,470,092 176,470,092
Percent Weighted Average Shares Outstanding Common Stock 90.00% 90.00% 90.00% 90.00%
Net earnings available to common shareholders $ 0 $ 0 $ 0 $ 0
Voting Common Stock dividends declared 0 (9,804) 0 (19,608)
Non-Voting Common Stock dividends declared (7,059) 0 (14,118) 0
Non-Voting Common Stock dividends declared (266,449) (340,062) (516,228) (668,603)
Undistributed earnings available to common stockholders, participating securities $ 239,804 $ 306,056 $ 464,605 $ 601,743
Undistributed earnings per share, common stock $ 1.36 $ 1.73 $ 2.63 $ 3.41
Dividends declared per share, distributed 0.04 0 0.08 0
Basic and diluted earnings per share Common Stock $ 1.40 $ 1.73 $ 2.71 $ 3.41
Nonvoting Common Stock [Member] | Common Stock [Member]        
Earnings Per Share Diluted Other Disclosures [Abstract]        
Weighted Average Number Of Shares Outstanding Basic 196,077,880 196,077,880 196,077,880 196,077,880