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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, 2023 | Jun. 30, 2022
Earnings Per Share Diluted Other Disclosures [Abstract] |  |
Net earnings available to common shareholders | $ 256,838 | $ 338,345
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%
Net earnings available to common shareholders | $ 0 | $ 0
Voting Common Stock dividends declared | 0 | (9,804)
Non-Voting Common Stock dividends declared | (7,059) | 0
Non-Voting Common Stock dividends declared | (249,779) | (328,541)
Undistributed earnings available to common stockholders, participating securities | $ 24,978 | $ 32,854
Undistributed earnings per share, common stock | $ 1.27 | $ 1.68
Dividends declared per share, distributed | 0 | 0.50
Basic and diluted earnings per share Common Stock | $ 1.27 | $ 2.18
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%
Net earnings available to common shareholders | $ 0 | $ 0
Voting Common Stock dividends declared | 0 | (9,804)
Non-Voting Common Stock dividends declared | (7,059) | 0
Non-Voting Common Stock dividends declared | (249,779) | (328,541)
Undistributed earnings available to common stockholders, participating securities | $ 224,801 | $ 295,687
Undistributed earnings per share, common stock | $ 1.27 | $ 1.68
Dividends declared per share, distributed | 0.04 | 0
Basic and diluted earnings per share Common Stock | $ 1.31 | $ 1.68
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

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