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ASU 2018 - 12 Transition - (Statement of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Statements Adjusted [Abstract] |  |  |
Benefits and losses | $ 167,035 | $ 164,079 | $ 185,571
Pretax earnings | 840,177 | 1,219,397 | 1,476,573
Net earnings available to common shareholders | $ 628,707 | 924,472 | 1,124,362
Basic earnings per share Common Stock | $ 3.04 |  |
Diluted earnings per share Common Stock | $ 3.04 |  |
Common Stock [Member] |  |  |
Statements Adjusted [Abstract] |  |  |
Net earnings available to common shareholders | $ 0 | $ 0 | $ 0
Basic earnings per share Common Stock | $ 3.04 | $ 5.54 | $ 7.08
Diluted earnings per share Common Stock |  | $ 5.54 | $ 7.08
Nonvoting Common Stock [Member] |  |  |
Statements Adjusted [Abstract] |  |  |
Net earnings available to common shareholders | $ 0 | $ 0 | $ 0
Basic earnings per share Common Stock | $ 3.22 | $ 4.62 | $ 5.58
Diluted earnings per share Common Stock | $ 3.22 | $ 4.62 | $ 5.58
Before Transition Date [Member] |  |  |
Statements Adjusted [Abstract] |  |  |
Benefits and losses |  | $ 165,553 | $ 186,647
Pretax earnings |  | 1,217,923 | 1,475,497
Net earnings available to common shareholders |  | $ 922,998 | $ 1,123,286
Before Transition Date [Member] | Common Stock [Member] |  |  |
Statements Adjusted [Abstract] |  |  |
Basic earnings per share Common Stock |  | $ 5.54 | $ 7.08
Diluted earnings per share Common Stock |  | 5.54 | 7.08
Before Transition Date [Member] | Nonvoting Common Stock [Member] |  |  |
Statements Adjusted [Abstract] |  |  |
Basic earnings per share Common Stock |  | 4.62 |
Diluted earnings per share Common Stock |  | $ 4.62 | $ 5.58
After Transition Date [Member] |  |  |
Statements Adjusted [Abstract] |  |  |
Benefits and losses |  | $ (1,474) | $ (1,076)
Pretax earnings |  | 1,474 | 1,076
Net earnings available to common shareholders |  | $ 1,474 | $ 1,076

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