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Earnings Per Share (Calculation of Basic and Diluted Earnings Per Share, Voting and Non Voting Common Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Earnings Per Share Diluted Other Disclosures [Abstract] |  |  |  |
Net earnings available to common shareholders | $ 199,244 | $ 281,466 | $ 885,261 | $ 1,036,539
Voting Common Stock dividends declared | 0 | (9,804) | (19,608) | (29,412)
Non-Voting Common Stock dividends declared | $ (7,059) | $ 0 | $ (7,059) | $ 0
Common Stock [Member] |  |  |  |
Earnings Per Share Diluted Other Disclosures [Abstract] |  |  |  |
Weighted average shares outstanding Common Stock | 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
Undistributed earnings available to common stockholders | 192,185 | 271,662 | 858,594 | 1,007,127
Undistributed earnings available to common stockholders, participating securities | $ 19,219 | $ 27,166 | $ 85,859 | $ 100,713
Undistibuted earnings per share, common stock | $ 0.98 | $ 1.39 | $ 4.38 | $ 5.14
Dividends declared per share, distributed | 0 | 0.50 | 1.00 | 1.50
Basic and diluted earnings per share Common Stock | $ 0.98 | $ 1.89 | $ 5.38 | $ 6.64
Nonvoting Common Stock [Member] |  |  |  |
Earnings Per Share Diluted Other Disclosures [Abstract] |  |  |  |
Weighted average shares outstanding Common Stock | 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
Undistributed earnings available to common stockholders, participating securities | $ 172,967 | $ 244,496 | $ 772,735 | $ 906,414
Undistibuted earnings per share, common stock | $ 0.98 | $ 1.39 | $ 4.38 | $ 5.14
Dividends declared per share, distributed | 0.04 | 0 | 0.04 | 0
Basic and diluted earnings per share Common Stock | $ 1.02 | $ 1.39 | $ 4.42 | $ 5.14
Nonvoting Common Stock [Member] | Common Stock [Member] |  |  |  |
Earnings Per Share Diluted Other Disclosures [Abstract] |  |  |  |
Weighted average shares outstanding Common Stock | 196,077,880 | 196,077,880 | 196,077,880 | 196,077,880

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