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Provision for Taxes (Narratives) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2018 | Mar. 31, 2019
Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |
NOL and credit carryforwards, federal amount | $ 146,000 |  |
Federal statutory rate, blended rate for fiscal year | 31.55% |  |
Provisional benefit amount | $ 356,600 |  |
Deferred tax assets, effect of Tax Cuts and Jobs Act, tax expense (benefit) | 371,500 |  |
Reclassified amount from accumulated other comprehensive income to retained earnings | 8,700 | $ 0 |
Provisional tax expense for foreign tax credits | 10,700 |  |
Phase three tax, increase in income tax expense | 4,200 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract] |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 12,800 |  | $ 9,500
Unrecognized tax benefits, income tax penalties and interest expense | 3,300 |  |
Amerco [Member] |  |  |
Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |
NOL and credit carryfowards, state amount | $ 337,300 |  | $ 172,300

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