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Related Party Transactions (Related Party Costs and Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Related party cost and expense: |  |  |  |
Related party expenses, total | $ 25,607 | $ 26,989 | $ 49,263 | $ 52,475
Blackwater [Member] |  |  |  |
Related party cost and expense: |  |  |  |
Operating Leases Rent Expense Net | 604 | 604 | 1,208 | 1,208
U-Haul printing expenses to Blackwater | 968 | 0 | 1,317 | 0
U-Haul commission expenses | $ 24,035 | $ 26,385 | $ 46,738 | $ 51,267

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