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Borrowings (Narratives) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | $ 2,688,758 |  | $ 2,190,869
Mortgages [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | 205,000 |  | 240,000
Senior mortgages [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | 1,121,897 |  | 717,512
Rental Truck (amortizing loans) First Loan [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | $ 218,998 |  | 202,784
Rental Truck (amortizing credit) Second Loan [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  |  | 115,000
Rental Truck (securitizations) [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | $ 62,838 |  | 75,846
Capital Lease Obligations [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | 672,825 |  | 602,470
Capital Lease Obligations [Member] | Amerco [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
New capital lease obligations, amount | 241,700 |  |
Notes, loans and leases payable | 672,800 |  |
Capitalized assets, net book value | $ 900,600 |  |
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 | $ 60,200 |  | $ 47,257
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] | Mortgages [Member] | Uhual International, Inc [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage | 6.93% |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 0.45% |  |
Applicable margin interest rate | 1.50% |  |
Sum of LIBOR and margin, maximum rate | 1.95% |  |
Debt instrument, interest rate at period end | 1.50% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | $ 205,000 |  |
Debt instruments, issuance and maturity dates: |  |  |
Mortgage loans on real estate, final maturity date | Apr. 01, 2023 |  |
Derivative, Maturity Date | Aug. 01, 2018 |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior mortgages [Member] | Uhaul International, Inc and AMERCO [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage rate range, minimum | 4.20% |  |
Debt instrument, interest rate, stated percentage rate range, maximum | 5.50% |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 0.44% |  |
Sum of LIBOR and margin, minimum rate | 2.44% |  |
Sum of LIBOR and margin, maximum rate | 2.94% |  |
Applicable margin, per loan agreement, minimum rate | 2.00% |  |
Applicable margin, per loan agreement, maximum rate | 2.50% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Amounts held at LIBOR plus margin | $ 136,600 |  |
Notes, loans and leases payable | $ 1,121,900 |  |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date range, start | Jan. 01, 2016 |  |
Debt instrument, maturity date range, end | Dec. 31, 2038 |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Revolving Fleet Loan One [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 0.44% |  |
Applicable margin interest rate | 1.75% |  |
Sum of LIBOR and margin, maximum rate | 2.19% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount | $ 75,000 |  |
Line of credit facility, maximum borrowing capacity | 225,000 |  |
Notes, loans and leases payable | $ 57,000 |  |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date | Sep. 30, 2018 |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Revolving Fleet Loan Two [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 0.44% |  |
Applicable margin interest rate | 1.15% |  |
Sum of LIBOR and margin, maximum rate | 1.59% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount | $ 100,000 |  |
Line of credit facility, maximum borrowing capacity | 125,000 |  |
Notes, loans and leases payable | $ 100,000 |  |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date | Mar. 31, 2020 |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Revolving Fleet Loan Three [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 0.43% |  |
Applicable margin interest rate | 1.85% |  |
Sum of LIBOR and margin, maximum rate | 2.28% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount | $ 70,000 |  |
Notes, loans and leases payable | $ 65,000 |  |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date | May 31, 2019 |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Revolving Fleet Loan Four [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 0.44% |  |
Applicable margin interest rate | 1.15% |  |
Sum of LIBOR and margin, maximum rate | 1.59% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount | $ 125,000 |  |
Notes, loans and leases payable | $ 125,000 |  |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date | Nov. 30, 2021 |  |
Amerco Real Estate Company [Member] | Working Capital Loans [Member] | Uhaul International, Inc and AMERCO [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
Sum of LIBOR and margin, maximum rate | 1.25% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Line of credit facility, maximum borrowing capacity | $ 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] | Uhaul International, Inc and AMERCO [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage rate range, minimum | 2.82% |  |
Debt instrument, interest rate, stated percentage rate range, maximum | 4.76% |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 0.44% |  |
LIBOR - highest rate | 0.45% |  |
Applicable margin, per loan agreement, minimum rate | 1.72% |  |
Applicable margin, per loan agreement, maximum rate | 2.50% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | $ 219,000 |  |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date range, start | Apr. 01, 2016 |  |
Debt instrument, maturity date range, end | Jul. 31, 2022 |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing credit) Second Loan [Member] | Uhaul International, Inc and AMERCO [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage rate range, minimum | 1.95% |  |
Debt instrument, interest rate, stated percentage rate range, maximum | 3.94% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Amounts held at LIBOR plus margin | $ 137,600 |  |
Uhaul S Fleet Two Thousand Ten Box Truck Note [Member] | Rental Truck (securitizations) [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage | 4.90% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount | $ 155,000 |  |
Notes, loans and leases payable | $ 62,800 |  |
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, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage rate range, minimum | 3.00% |  |
Debt instrument, interest rate, stated percentage rate range, maximum | 8.00% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | $ 65,800 |  |
Subsidiary holdings of parent company debt | $ 5,600 |  |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date range, start | Jan. 01, 2016 |  |
Debt instrument, maturity date range, end | Dec. 31, 2045 |  |
Life Insurance [Member] | FHLB [Member] |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |
Deposit amount |  | $ 30,000 |
Deposit interest rate |  | 0.39% |

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