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Condensed Financial Information Of Amerco Statements Of Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Net earnings | $ 356,741 us-gaap_NetIncomeLoss | $ 342,391 us-gaap_NetIncomeLoss | $ 264,708 us-gaap_NetIncomeLoss
AMERCO [Member] |  |  |
Net earnings | 356,741 us-gaap_NetIncomeLoss / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember | 342,391 us-gaap_NetIncomeLoss / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember | 264,708 us-gaap_NetIncomeLoss / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember
Other comprehensive income (loss) | 19,558 us-gaap_ProfitLoss / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember | (31,243)us-gaap_ProfitLoss / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember | 22,756 us-gaap_ProfitLoss / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember
Total comprehensive income | $ 376,299 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember | $ 311,148 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember | $ 287,464 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember

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