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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share Diluted Other Disclosures [Abstract]        
Percent Weighted Average Shares Outstanding Common Stock 10.00% 10.00% 10.00% 10.00%
Net earnings available to common shareholders $ 105,550 $ 186,798 $ 247,881 $ 382,215
Non-Voting Common Stock dividends declared     (17,647) (17,647)
Undistributed earnings available to common stockholders 96,727 177,975 230,234 364,568
Undistributed Earnings (Loss) Available to Common Shareholders, Basic, Total $ 96,727 $ 177,975 $ 230,234 $ 364,568
Undistributed earnings per share, common stock     $ 1.17 $ 1.86
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%
Non-Voting Common Stock dividends declared $ (8,823) $ (8,823)    
Undistributed earnings available to common stockholders 9,673 17,798 $ 23,023 $ 36,457
Undistributed Earnings (Loss) Available to Common Shareholders, Basic, Total $ 9,673 $ 17,798 $ 23,023 $ 36,457
Undistributed earnings per share, common stock $ 0.49 $ 0.91    
Income Loss From Continuing Operations Per Basic Share, Total $ 0.49 $ 0.91 $ 1.17 $ 1.86
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 $ 105,550 $ 186,798 $ 247,881 $ 382,215
Non-Voting Common Stock dividends declared (8,823) (8,823) (17,647) (17,647)
Undistributed earnings available to common stockholders 87,054 160,178 207,211 328,111
Undistributed Earnings (Loss) Available to Common Shareholders, Basic, Total $ 87,054 $ 160,178 $ 207,211 $ 328,111
Undistributed earnings per share, common stock $ 0.49 $ 0.91 $ 1.17 $ 1.86
Dividends declared per share, distributed 0.05 0.05 0.1 0.1
Income Loss From Continuing Operations Per Basic Share, Total $ 0.54 $ 0.96 $ 1.27 $ 1.96
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