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Provision for Taxes (Narratives) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |
NOL and credit carryforwards, federal amount | $ 358.9 |  |
Federal statutory rate, blended rate for fiscal year | 31.55% |  |
Provisional benefit amount | $ 356.6 |  |
Deferred tax assets, effect of Tax Cuts and Jobs Act, tax expense (benefit) | 371.5 |  |
Reclassified amount from accumulated other comprehensive income to retained earnings | 8.7 |  |
Provisional tax expense for foreign tax credits | 10.7 |  |
Phase three tax, increase in income tax expense | 4.2 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract] |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 9.5 | $ 8.5 |
Unrecognized tax benefits, income tax penalties and interest expense | 1.0 |  |
Amerco [Member] |  |  |
Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |
NOL and credit carryfowards, state amount | $ 172.3 | $ 45.3 |

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- Definition Amount of provisional income tax expense (benefit) for remeasurement amount of reasonable estimate for income tax expense (benefit) from transition tax on Phase Three Tax pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Amount of income tax expense (benefit) for remeasurement of deferred tax asset from change in tax rate and amount of reasonable estimate for income tax expense (benefit) from transition tax on accumulated earnings deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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