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Long-term Debt Borrowings (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Mar. 31, 2012
Debt instrument, maturities: |  |  |
Notes, loans and leases payable | $ 1,667,008 |  | $ 1,486,211
Real estate loan (amortizing term) - First |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) | 6.93% | [1] |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year | 2018 |  |
Notes, loans and leases payable | 237,500 |  | 245,000
Real estate loan (revolving credit) - First |  |  |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year | 2018 |  |
Real estate loan (amortizing term) - Second |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage (a) | 2.11% | [1] |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year | 2016 |  |
Notes, loans and leases payable | 24,779 |  | 25,451
Real estate loan (revolving credit) - Second |  |  |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year | 2013 |  |
Notes, loans and leases payable | 0 |  | 23,920
Senior mortgages |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage rate range, minimum | 4.90% | [1] |
Debt instrument, interest rate, stated percentage rate range, maximum | 5.75% | [1] |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year range, start | 2015 |  |
Debt instrument, maturity year range, end | 2038 |  |
Notes, loans and leases payable | 560,775 |  | 459,822
Working capital Loan (revolving credit) |  |  |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year | 2013 |  |
Fleet loans (amortizing term) |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage rate range, minimum | 1.75% | [1] |
Debt instrument, interest rate, stated percentage rate range, maximum | 6.92% | [1] |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year range, start | 2012 |  |
Debt instrument, maturity year range, end | 2020 |  |
Notes, loans and leases payable | 360,690 |  | 384,888
Fleet loans (securitization) |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage rate range, minimum | 4.90% | [1] |
Debt instrument, interest rate, stated percentage rate range, maximum | 5.56% | [1] |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year range, start | 2014 |  |
Debt instrument, maturity year range, end | 2017 |  |
Notes, loans and leases payable | 196,179 |  | 228,655
Capital lease obligations |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage rate range, minimum | 2.37% | [1] |
Debt instrument, interest rate, stated percentage rate range, maximum | 9.57% | [1] |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year range, start | 2015 |  |
Debt instrument, maturity year range, end | 2019 |  |
Notes, loans and leases payable | 274,394 |  | 109,689
Other obligations |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage rate range, minimum | 3.00% | [1] |
Debt instrument, interest rate, stated percentage rate range, maximum | 8.00% | [1] |
Debt instrument, maturities: |  |  |
Debt instrument, maturity year range, start | 2013 |  |
Debt instrument, maturity year range, end | 2042 |  |
Notes, loans and leases payable | $ 12,691 |  | $ 8,786
[1] | Interest rate as of December 31, 2012, 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: | instant

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: | instant

X
- Definition This schedule requires an instant element. The DebtInstrumentMaturityDate could have worked for this element, but it is a duration period type and also 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: | instant

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 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 2: 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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(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: | duration

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- Definition When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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Namespace Prefix: | us-gaap_
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- Details
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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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