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Borrowings (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | $ 2,827,052 | $ 2,665,396 |
Interest paid related to derivative contracts [Abstract] |  |  |
Interest paid in cash | 27,200 |  | $ 22,000
Real estate loan [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | 202,500 | 205,000 |
Senior Mortgages [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | 1,116,682 | 1,121,897 |
Rental Truck (amortizing loans) First Loan [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | 218,076 | 218,998 |
Rental Truck (securitizations) [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | 60,139 | 62,838 |
Capital Lease Obligations [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | 778,731 | 672,825 |
Capital Lease Obligations [Member] | AMERCO [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
New capital lease obligiations, amount | 143,500 |  |
Notes, loans and leases payable | 778,700 |  |
Capitalized assets, net book value | $ 1,065,100 |  |
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 | $ 63,547 | 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% |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 0.45% |  |
Applicable margin interest rate | 1.50% |  |
Debt instrument, interest rate at period end | 1.95% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | $ 202,500 |  |
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 Co and Uhaul International, Inc [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 0.45% |  |
LIBOR - highest rate | 0.46% |  |
Applicable margin, per loan agreement, minimum rate | 2.00% |  |
Applicable margin, per loan agreement, maximum rate | 2.50% |  |
Sum of LIBOR and margin, minimum rate | 2.46% |  |
Sum of LIBOR and margin, maximum rate | 2.95% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Amounts held at LIBOR plus margin | $ 135,100 |  |
Notes, loans and leases payable | $ 1,116,700 |  |
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] | Senior Mortgages [Member] | Amerco Real Estate Co and Uhaul International, Inc [Member] | Minimum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage | 4.20% |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior Mortgages [Member] | Amerco Real Estate Co and Uhaul International, Inc [Member] | Maximum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage | 5.50% |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Revolving fleet loan one [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 0.45% |  |
LIBOR - highest rate | 1.15% |  |
Sum of LIBOR and margin, maximum rate | 1.60% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount | $ 75,000 |  |
Line of credit facility, maximum borrowing capacity | 225,000 |  |
Line of credit, current borrowing capacity | 150,000 |  |
Notes, loans and leases payable | $ 127,000 |  |
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 | 0.46% |  |
LIBOR - highest rate | 1.15% |  |
Sum of LIBOR and margin, maximum rate | 1.61% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount | $ 100,000 |  |
Line of credit facility, maximum borrowing capacity | 215,000 |  |
Notes, loans and leases payable | $ 88,000 |  |
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 | 0.45% |  |
LIBOR - highest rate | 1.85% |  |
Sum of LIBOR and margin, maximum rate | 2.30% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount | $ 70,000 |  |
Notes, loans and leases payable | $ 70,000 |  |
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 | 0.46% |  |
LIBOR - highest rate | 1.15% |  |
Sum of LIBOR and margin, maximum rate | 1.61% |  |
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] | 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 |  |
Line of credit facility, remaining 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, effective percentage: |  |  |
LIBOR | 0.44% |  |
LIBOR - highest rate | 0.46% |  |
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 | $ 218,100 |  |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date range, start | Jul. 01, 2017 |  |
Debt instrument, maturity date range, end | May 31, 2023 |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | Uhaul International, Inc and AMERCO [Member] | Minimum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage | 2.82% |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | Uhaul International, Inc and AMERCO [Member] | Maximum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage | 4.76% |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) second loan [Member] | Uhaul International, Inc and AMERCO [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Amounts held at LIBOR plus margin | $ 143,600 |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) second loan [Member] | Uhaul International, Inc and AMERCO [Member] | Minimum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage | 1.95% |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) second loan [Member] | Uhaul International, Inc and AMERCO [Member] | Maximum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage | 3.94% |  |
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 | $ 60,100 |  |
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 | $ 68,800 |  |
Subsidiary holdings of parent company debt | $ 5,300 |  |
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% |  |
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% |  |
Life Insurance [Member] | Federal Home Loan Bank [Member] |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |
Deposit amount |  | 48,400 |
Deposit amount, portion subject to fixed interest rate |  | $ 30,000 |
Fixed interest rate |  | 0.57% |
Deposit component subject to fixed interest rate, maturity date |  | Sep. 30, 2016 |
Deposit amount, portion subject to variable interest rate |  | $ 18,400 |
Variable interest rate |  | 0.48% |

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