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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
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share Diluted Other Disclosures [Abstract]    
Net earnings available to common shareholders $ 142,331 $ 195,417
Undistributed earnings available to common stockholders $ 133,507 $ 186,593
Common Stock [Member]    
Earnings Per Share Diluted Other Disclosures [Abstract]    
Weighted Average Number Of Shares Outstanding Basic 19,607,788 19,607,788
Percent Weighted Average Shares Outstanding Common Stock 10.00% 10.00%
Non-Voting Common Stock dividends declared $ (8,824) $ (8,824)
Undistributed earnings available to common stockholders $ 13,351 $ 18,659
Undistributed earnings per share, common stock $ 0.68 $ 0.95
Income Loss From Continuing Operations Per Basic Share, Total $ 0.68 $ 0.95
Nonvoting Common Stock [Member]    
Earnings Per Share Diluted Other Disclosures [Abstract]    
Weighted Average Number Of Shares Outstanding Basic 176,470,092 176,470,092
Percent Weighted Average Shares Outstanding Common Stock 90.00% 90.00%
Non-Voting Common Stock dividends declared $ (8,824) $ (8,824)
Undistributed earnings available to common stockholders, participating securities $ 120,156 $ 167,934
Undistributed earnings per share, common stock $ 0.68 $ 0.95
Dividends declared per share, distributed 0.05 0.05
Income Loss From Continuing Operations Per Basic Share, Total $ 0.73 $ 1
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