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Borrowings (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Mar. 31, 2016
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | $ 2,992,490 |  |  | $ 2,992,490 |  | $ 2,665,396
Interest paid related to derivative contracts [Abstract] |  |  |  |  |  |
Interest paid in cash | 28,100 |  | $ 22,600 | 55,300 | $ 44,600 |
Real estate loan [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 174,289 |  |  | 174,289 |  | 205,000
Senior Mortgages [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 1,202,737 |  |  | 1,202,737 |  | 1,121,897
Rental Truck (amortizing loans) First Loan [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 227,781 |  |  | 227,781 |  | 218,998
Fleet Loan Securitization [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 56,195 |  |  | 56,195 |  | 62,838
Capital Lease Obligations [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 826,931 |  |  | 826,931 |  | 672,825
Capital Lease Obligations [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 826,900 |  |  | 826,900 |  |
New capital lease obligations, amount |  |  |  | 233,900 |  |
Capitalized assets, net book value | 1,161,100 |  |  | $ 1,161,100 |  |
Debt instruments, miscellaneous information: |  |  |  |  |  |
Terms of lease |  |  |  | Between 5 and 7 years |  |
Other Obligations [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | $ 66,238 |  |  | $ 66,238 |  | $ 60,200
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] | Real estate loan [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 6.93% |  |  | 6.93% |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 0.52% |  |  | 0.52% |  |
Applicable margin interest rate | 1.50% |  |  | 1.50% |  |
Debt instrument, interest rate at period end |  |  |  | 1.50% |  |
Sum of LIBOR and margin, maximum rate | 2.02% |  |  | 2.02% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Line of credit facility, remaining borrowing capacity | $ 132,800 |  |  | $ 132,800 |  |
Amounts held at LIBOR plus margin | 41,500 |  |  | 41,500 |  |
Notes, loans and leases payable | $ 174,300 |  |  | $ 174,300 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Mortgage loans on real estate, final maturity date |  |  |  | Apr. 30, 2023 |  |
Debt instrument, maturity date |  |  |  | Aug. 31, 2018 |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior Mortgages [Member] | Amerco Real Estate and U-Haul Int'l Guarantor [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 0.51% |  |  | 0.51% |  |
LIBOR - highest rate | 0.53% |  |  | 0.53% |  |
Applicable margin, per loan agreement, minimum rate | 2.00% |  |  | 2.00% |  |
Applicable margin, per loan agreement, maximum rate | 2.50% |  |  | 2.50% |  |
Sum of LIBOR and margin, minimum rate | 2.53% |  |  | 2.53% |  |
Sum of LIBOR and margin, maximum rate | 3.03% |  |  | 3.03% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Amounts held at LIBOR plus margin | $ 133,600 |  |  | $ 133,600 |  |
Notes, loans and leases payable | $ 1,202,700 |  |  | $ 1,202,700 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity date range, start |  |  |  | Jan. 01, 2017 |  |
Debt instrument, maturity date range, end |  |  |  | Dec. 31, 2038 |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior Mortgages [Member] | Amerco Real Estate and U-Haul Int'l Guarantor [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 3.72% |  |  | 3.72% |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior Mortgages [Member] | Amerco Real Estate and U-Haul Int'l Guarantor [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 5.50% |  |  | 5.50% |  |
Amerco Real Estate Company [Member] | Working Capital Loans [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Sum of LIBOR and margin, maximum rate | 1.25% |  |  | 1.25% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 50,000 |  |  | $ 50,000 |  |
Line of credit, current borrowing capacity | $ 50,000 |  |  | $ 50,000 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Sep. 30, 2018 |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | AMERCO and UHaul International, Inc [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 0.52% |  |  | 0.52% |  |
Applicable margin, per loan agreement, minimum rate | 1.72% |  |  | 1.72% |  |
Applicable margin, per loan agreement, maximum rate | 2.50% |  |  | 2.50% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | $ 227,800 |  |  | $ 227,800 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity date range, start |  |  |  | Jul. 01, 2017 |  |
Debt instrument, maturity date range, end |  |  |  | Sep. 30, 2023 |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | AMERCO and UHaul International, Inc [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 2.82% |  |  | 2.82% |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | AMERCO and UHaul International, Inc [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 4.76% |  |  | 4.76% |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) Second loan [Member] | AMERCO and UHaul International, Inc [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Amounts held at LIBOR plus margin | $ 155,600 |  |  | $ 155,600 |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) Second loan [Member] | AMERCO and UHaul International, Inc [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 1.95% |  |  | 1.95% |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) Second loan [Member] | AMERCO and UHaul International, Inc [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 3.94% |  |  | 3.94% |  |
Uhaul Intl and Subsidiaries [Member] | Revolving fleet loan one [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 0.52% |  |  | 0.52% |  |
Applicable margin interest rate | 1.15% |  |  | 1.15% |  |
Debt instrument, interest rate at period end |  |  |  | 1.67% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Debt instrument, original face amount | $ 150,000 |  |  | $ 150,000 |  |
Line of credit facility, maximum borrowing capacity | 225,000 |  |  | 225,000 |  |
Notes, loans and leases payable | $ 150,000 |  |  | $ 150,000 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Sep. 30, 2018 |  |
Uhaul Intl and Subsidiaries [Member] | Revolving fleet loan two [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 0.52% |  |  | 0.52% |  |
Applicable margin interest rate | 1.15% |  |  | 1.15% |  |
Debt instrument, interest rate at period end |  |  |  | 1.67% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Debt instrument, original face amount | $ 100,000 |  |  | $ 100,000 |  |
Line of credit facility, maximum borrowing capacity | 215,000 |  |  | 215,000 |  |
Notes, loans and leases payable | $ 147,000 |  |  | $ 147,000 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Mar. 31, 2020 |  |
Uhaul Intl and Subsidiaries [Member] | Revolving fleet loan three [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 0.52% |  |  | 0.52% |  |
Applicable margin interest rate | 1.85% |  |  | 1.85% |  |
Debt instrument, interest rate at period end |  |  |  | 2.37% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Debt instrument, original face amount | $ 70,000 |  |  | $ 70,000 |  |
Line of credit facility, maximum borrowing capacity | 50,000 |  |  | 50,000 |  |
Notes, loans and leases payable | $ 40,000 |  |  | $ 40,000 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | May 31, 2019 |  |
Uhaul Intl and Subsidiaries [Member] | Revolving fleet loan four [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 0.52% |  |  | 0.52% |  |
Applicable margin interest rate | 1.15% |  |  | 1.15% |  |
Debt instrument, interest rate at period end |  |  |  | 1.67% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Debt instrument, original face amount | $ 125,000 |  |  | $ 125,000 |  |
Notes, loans and leases payable | $ 125,000 |  |  | $ 125,000 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Nov. 30, 2021 |  |
Uhaul S Fleet Two Thousand Ten Box Truck Note [Member] | Fleet Loan Securitization [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 4.90% |  |  | 4.90% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Debt instrument, original face amount | $ 155,000 |  |  | $ 155,000 |  |
Notes, loans and leases payable | 56,200 |  |  | $ 56,200 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Oct. 31, 2017 |  |
Amerco, Us Bank, National Association, Trustee [Member] | Other Obligations [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 71,100 |  |  | $ 71,100 |  |
Subsidiary holdings of parent company debt | $ 4,900 |  |  | $ 4,900 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity date range, start |  |  |  | Jan. 01, 2016 |  |
Debt instrument, maturity date range, end |  |  |  | Dec. 31, 2045 |  |
Amerco, Us Bank, National Association, Trustee [Member] | Other Obligations [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 3.00% |  |  | 3.00% |  |
Amerco, Us Bank, National Association, Trustee [Member] | Other Obligations [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 8.00% |  |  | 8.00% |  |
Life Insurance [Member] | Federal Home Loan Bank [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Fixed interest rate |  | 0.57% |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Deposit amount |  | $ 30,000 |  |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Deposit maturity date |  | Sep. 30, 2016 |  |  |  |

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