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Related Party Transactions (Related Party Costs and Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Related party cost and expense: |  |  |  |
Costs and Expenses, Related Party | $ 32,900 | $ 25,600 | $ 63,422 | $ 49,263
Blackwater [Member] |  |  |  |
Related party cost and expense: |  |  |  |
Costs and Expenses, Related Party | 32,854 | 25,607 |  |
Lease expenses | Blackwater [Member] |  |  |  |
Related party cost and expense: |  |  |  |
Costs and Expenses, Related Party | 604 | 604 | 1,208 | 1,208
Lease expenses | Mercury [Member] |  |  |  |
Related party cost and expense: |  |  |  |
Costs and Expenses, Related Party | 38 |  | 76 |
Printing expenses | Blackwater [Member] |  |  |  |
Related party cost and expense: |  |  |  |
Costs and Expenses, Related Party | 1,455 | 968 | 2,558 | 1,317
Commission expenses | Blackwater [Member] |  |  |  |
Related party cost and expense: |  |  |  |
Costs and Expenses, Related Party | 24,434 | $ 24,035 | 47,129 | $ 46,738
Commission expenses | Mercury [Member] |  |  |  |
Related party cost and expense: |  |  |  |
Costs and Expenses, Related Party | $ 6,323 |  | $ 12,451 |

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- Definition Related Party Cost And Expense Abstract + References No definition available. + Details
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- Definition Costs of sales and operating expenses for the period incurred from transactions with related parties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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