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Components of Interest Expense (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Interest expense, borrowings:      
Interest expense $ 80,905us-gaap_InterestExpenseDebtExcludingAmortization $ 72,538us-gaap_InterestExpenseDebtExcludingAmortization $ 66,159us-gaap_InterestExpenseDebtExcludingAmortization
Capitalized interest (1,204)us-gaap_InterestCostsCapitalizedAdjustment (571)us-gaap_InterestCostsCapitalizedAdjustment (415)us-gaap_InterestCostsCapitalizedAdjustment
Amortization of transaction costs 3,495us-gaap_AmortizationOfDebtDiscountPremium 3,551us-gaap_AmortizationOfDebtDiscountPremium 4,133us-gaap_AmortizationOfDebtDiscountPremium
Interest expense resulting from derivatives 14,329us-gaap_DerivativeLossOnDerivative 17,174us-gaap_DerivativeLossOnDerivative 20,819us-gaap_DerivativeLossOnDerivative
Total interest expense 97,525us-gaap_InterestExpense 92,692us-gaap_InterestExpense 90,696us-gaap_InterestExpense
Write-off of transaction costs related to early extinguishment of debt 298us-gaap_WriteOffOfDeferredDebtIssuanceCost      
Fees on early extinguishment of debt 3,783uhal_FeesOnEarlyExtinguishmentOfDebt      
Fees and amortization of early extinguishment of debt 4,081uhal_FeesAndAmortizationOnEarlyExtinguishmentOfDebt 0uhal_FeesAndAmortizationOnEarlyExtinguishmentOfDebt 0uhal_FeesAndAmortizationOnEarlyExtinguishmentOfDebt
Total $ 101,606uhal_InterestExpenseFeesAmortizationOnEarlyExtinguishmentDebt $ 92,692uhal_InterestExpenseFeesAmortizationOnEarlyExtinguishmentDebt $ 90,696uhal_InterestExpenseFeesAmortizationOnEarlyExtinguishmentDebt