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Schedule II, AMERCO and Consolidated Subsidiaries, Valuation and Qualifying Accounts (Details) (AMERCO [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Allowance for doubtful accounts (deducted from trade receivable) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 958 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | $ 994 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | $ 1,128 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember
Additions charged to cost and expenses | 994 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | 958 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | 1,184 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember
Additions charged to other accounts |  |  |
Deductions | (1,162)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | (994)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | (1,318)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember
Balance at year end | 790 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | 958 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember | 994 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForTradeReceivablesMember
Allowance for obsolescence (deducted from inventory) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 2,487 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationAndObsolescenceMember | 1,711 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationAndObsolescenceMember | 730 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationAndObsolescenceMember
Additions charged to cost and expenses |  | 776 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationAndObsolescenceMember | 981 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationAndObsolescenceMember
Additions charged to other accounts |  |  |
Deductions | (1,103)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationAndObsolescenceMember |  |
Balance at year end | 1,384 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationAndObsolescenceMember | 2,487 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationAndObsolescenceMember | 1,711 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationAndObsolescenceMember
Allowance for LIFO (deducted from inventory) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 14,788 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationReserveMember | 14,693 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationReserveMember | 14,541 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationReserveMember
Additions charged to cost and expenses | 231 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationReserveMember | 95 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationReserveMember | 152 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationReserveMember
Additions charged to other accounts |  |  |
Deductions |  |  |
Balance at year end | 15,019 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationReserveMember | 14,788 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationReserveMember | 14,693 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_InventoryValuationReserveMember
Allowance for probable losses (deducted from mortgage loans) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 370 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesRealEstateMember | 370 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesRealEstateMember | 370 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesRealEstateMember
Additions charged to cost and expenses |  |  |
Additions charged to other accounts |  |  |
Deductions |  |  |
Balance at year end | $ 370 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesRealEstateMember | $ 370 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesRealEstateMember | $ 370 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesRealEstateMember

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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