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Long-term Debt Borrowings, Text Portion (Details) (USD $) |  |  | 6 Months Ended
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Sep. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2012 Amerco Real Estate, Subsidiaries, and U-Haul Co. of Florida Mortgages U-Haul Guarantor | Sep. 30, 2012 Amerco Real Estate, Subsidiaries, and U-Haul Co. of Florida Line of Credit U-Haul Guarantor | Sep. 30, 2012 Amerco Real Estate and Subsidiaries of U-Haul Int'l Construction Loans U-Haul Int'l and Amerco Guarantor | Sep. 30, 2012 Amerco Real Estate and U-Haul Company of Florida Line of Credit U-Haul Int'l and Amerco Guarantor | Sep. 30, 2012 Various Subsidiaries of Amerco Real Estate and U-Haul Int'l Senior Mortgage Amerco Real Estate and U-Haul Int'l Guarantor | Sep. 30, 2012 Amerco Real Estate Company Capital Lease Obligations U-Haul Int'l and Amerco Guarantor | Sep. 30, 2012 U-Haul Int'l and Subsidiaries Rental Truck (Amortizing Credit) First Loan U-Haul Int'l and Amerco Guarantor | Sep. 30, 2012 U-Haul Int'l and Subsidiaries Rental Truck (Amortizing Credit) Second Loan U-Haul Int'l and Amerco Guarantor | Sep. 30, 2012 Subsidiaries of U-Haul Int'l Cargo Van and Pickup Acquisitions U-Haul Int'l and Amerco Guarantor | Sep. 30, 2012 U-Haul S Fleet 2007 Box Truck Note Securitization First Loan | Sep. 30, 2012 U-Haul S Fleet 2010 Box Truck Note Securitization Second Loan | Sep. 30, 2012 Amerco Capital Leases for New Equipment | Sep. 30, 2012 Amerco and US Bank, National Association, the Trustee U-Haul Investor Club
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 6.93% |  |  |  |  |  |  |  | 3.52% | 5.56% | 4.90% |  |
Debt instrument, interest rate, stated percentage rate range, minimum |  |  |  | 1.50% |  |  | 4.90% |  | 3.00% | 3.94% |  |  |  |  | 3.00%
Debt instrument, interest rate, stated percentage rate range, maximum |  |  |  | 2.00% |  |  | 5.75% |  | 6.92% |  | 3.53% |  |  |  | 8.00%
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR |  |  | 0.23% |  | 0.23% |  |  |  | 0.22% |  |  |  |  |  |
LIBOR - highest rate |  |  |  |  |  |  |  |  | 0.23% |  |  |  |  |  |
Applicable margin interest rate |  |  | 1.50% |  | 1.90% | 1.50% |  | 1.25% |  |  |  |  |  |  |
Applicable margin interest rate, adjusted |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |
Debt instrument, interest rate at period end |  |  | 1.73% |  | 2.13% |  |  |  |  |  |  |  |  |  |
Applicable margin, per loan agreement, minimum rate |  |  |  |  |  |  |  |  | 0.90% |  |  |  |  |  |
Applicable margin, per loan agreement, maximum rate |  |  |  |  |  |  |  |  | 2.63% |  |  |  |  |  |
Applicable margins, low rate |  |  |  |  |  |  |  |  | 0.90% |  |  |  |  |  |
Applicable margins, high rate |  |  |  |  |  |  |  |  | 2.63% |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 300,000,000 |  |  |  |  |  |  |  | $ 115,000,000 |  |  |  |
Debt instrument, original face amount |  |  |  |  |  |  |  |  |  |  | 85,000,000 |  |  |  |
Debt instrument, increase in face amount |  |  |  |  |  |  |  |  |  |  | 95,000,000 |  |  |  |
Debt instrument, associate another note amount |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | 193,000,000 | 26,000,000 | 100,000,000 |  | 25,000,000 |  |  |  | 217,000,000 | 155,000,000 |  |
Line of credit facility, remaining borrowing capacity |  |  |  | 193,000,000 |  | 100,000,000 |  | 25,000,000 |  |  |  |  |  |  |
Notes, loans and leases payable | 1,556,891,000 | 1,486,211,000 | 240,000,000 |  | 25,100,000 |  | 489,700,000 |  | 209,700,000 | 17,700,000 |  | 88,100,000 | 116,000,000 | 263,400,000 | 16,000,000
Subsidiary holdings of parent company debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, final maturity date |  |  | Aug. 10, 2018 | Aug. 10, 2018 | Jun. 30, 2016 | Apr. 30, 2013 |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  | Nov. 30, 2013 |  |  | Aug. 26, 2016 | Feb. 25, 2014 | Oct. 25, 2017 |  |
Debt instrument, maturity date range, start |  |  |  |  |  |  | Jul. 01, 2015 |  | Oct. 12, 2012 | Oct. 12, 2012 |  |  |  |  | Jun. 30, 2013
Debt instrument, maturity date range, end |  |  |  |  |  |  | Oct. 11, 2022 |  | Apr. 16, 2019 | Apr. 16, 2019 |  |  |  |  | May 31, 2042
Debt instrument, issuance date |  |  |  |  | Jun. 29, 2006 | Apr. 29, 2011 |  |  |  |  | Dec. 31, 2009 | Jun. 01, 2007 | Oct. 28, 2010 |  | Feb. 28, 2011
Loan modification and extension date |  |  |  |  | Jun. 27, 2011 | Mar. 31, 2012 |  | Mar. 31, 2012 |  |  | May 31, 2017 |  |  |  |
Term note amended date |  |  |  |  |  |  |  |  |  |  | Aug. 26, 2011 |  |  |  |
Debt instrument, earliest issuance date |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 29, 2008 |
Debt instrument, latest issuance date |  |  |  |  |  |  |  |  |  |  | Dec. 22, 2011 |  |  | Sep. 28, 2012 |
Purchase equipment through fiscal year |  |  |  |  |  |  |  |  |  |  |  | 2008 |  |  |
Debt instruments, miscellaneous information: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terms of lease |  |  |  |  |  |  |  |  |  |  |  |  |  | Between 5 and 7 years |

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- Definition Fleet loan provision specified LIBOR plus applicable margin. This is the lower of the two applicable margin rates at the time of the loan agreement. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument includes a new note added during the life of the debt, which may vary from the carrying amount because of unamortized premium or discount. + References No definition available. + Details
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- Definition The terms of the debt agreement were changed after the effective date of the loan. The marginal interest rate was also changed at this time. This is the new interest rate under the new terms of the agreement. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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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- Definition A general description of the lessee's leasing arrangements including, but not limited to, the following: a) the basis on which contingent rental payments are determined; (b) the existence and terms of renewal or purchase options and escalation clauses; (c) restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 01-8 -Paragraph 7, 8, 10, 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6394851&loc=SL2265659-115463 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 15 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6451445&loc=d3e32400-112679 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + 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 rate subject to change from time to time. + 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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- Definition Stated maturity date of the mortgage loan receivable on real estate, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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