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v3.8.0.1

Borrowings (Long-term Debt Borrowings) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017
Debt instrument, maturities: |  |  |
Notes, loans and leases payable, gross |  | $ 3,447,948 | $ 3,287,233
Less: Debt issuance costs |  | (25,871) | (24,353)
Total notes, loans and leases payable |  | $ 3,422,077 | 3,262,880
Real estate loan (amortizing term) [Member] |  |  |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year |  | 2023 |
Total notes, loans and leases payable |  | $ 140,287 | 169,289
Real estate loan (amortizing term) [Member] | Minimum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) | [1] | 2.74% |
Real estate loan (amortizing term) [Member] | Maximum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) | [1] | 6.93% |
Senior Mortgages [Member] |  |  |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year range, start |  | 2022 |
Debt instrument, maturity year range, end |  | 2038 |
Total notes, loans and leases payable |  | $ 1,405,702 | 1,292,160
Senior Mortgages [Member] | Minimum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) | [1] | 3.72% |
Senior Mortgages [Member] | Maximum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) | [1] | 5.50% |
Working capital loan (revolving credit) [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) |  | 2.74% |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year |  | 2018 |
Total notes, loans and leases payable |  | $ 55,000 | 85,000
Fleet loans (amortizing term) [Member] |  |  |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year range, start |  | 2018 |
Debt instrument, maturity year range, end |  | 2024 |
Total notes, loans and leases payable |  | $ 319,631 | 324,977
Fleet loans (amortizing term) [Member] | Minimum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) | [1] | 1.95% |
Fleet loans (amortizing term) [Member] | Maximum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) | [1] | 4.76% |
Rental Truck (securitization) [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) | [1] | 4.90% |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year |  | 2017 |
Total notes, loans and leases payable |  | $ 47,183 | 52,112
Fleet loans (revolving credit) [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) |  | 2.39% |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year range, start |  | 2020 |
Debt instrument, maturity year range, end |  | 2021 |
Total notes, loans and leases payable |  | $ 446,000 | 417,000
Capital Leases (rental equipment) [Member] |  |  |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year range, start |  | 2017 |
Debt instrument, maturity year range, end |  | 2024 |
Total notes, loans and leases payable |  | $ 962,140 | 876,828
Capital Leases (rental equipment) [Member] | Minimum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) | [1] | 1.92% |
Capital Leases (rental equipment) [Member] | Maximum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) | [1] | 4.86% |
Other Obligations [Member] |  |  |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year range, start |  | 2017 |
Debt instrument, maturity year range, end |  | 2047 |
Total notes, loans and leases payable |  | $ 72,005 | $ 69,867
Other Obligations [Member] | Minimum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) | [1] | 2.75% |
Other Obligations [Member] | Maximum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) | [1] | 8.00% |
[1] | Interest rate as of September 30, 2017, including the effect of applicable hedging instruments

X
- Definition The latest maturity year for these debt instruments. + References No definition available. + Details
Name: | uhal_MaturityEndYear
Namespace Prefix: | uhal_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition The earliest maturity year for these debt instruments. + References No definition available. + Details
Name: | uhal_MaturityStartYear
Namespace Prefix: | uhal_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition The DebtInstrumentMaturityDate could have worked for this element, but it must include the format Month-Date-Year. Will use this US-GAAP Element in the next few schedules, when possible, where we break down the various items that make up the Borrowing's narrative. + References No definition available. + Details
Name: | uhal_MaturityYear
Namespace Prefix: | uhal_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentageAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_MediumTermNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=uhal_FleetLoanSecuritizationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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