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Borrowings (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2016
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | $ 3,386,851 | $ 3,262,880 |
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 | 166,789 | 169,289 |
Senior Mortgages [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | 1,366,248 | 1,292,160 |
Working Capital Loans [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | 85,000 | 85,000 |
Rental Truck (amortizing loans) First Loan [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | 341,313 | 324,977 |
Fleet Loan Securitization [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | 50,055 | 52,112 |
Capital Lease Obligations [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | 909,406 | 876,828 |
Capital Lease Obligations [Member] | AMERCO [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
New capital lease obligiations, amount | 87,400 |  |
Notes, loans and leases payable | 909,400 | 876,800 |
Capitalized assets, net book value | $ 1,259,100 | 1,233,300 |
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 | $ 70,216 | 69,867 |
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] | Real estate loan [Member] | Uhaul International, Inc [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage | 6.93% |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 1.12% |  |
Applicable margin interest rate | 1.50% |  |
Debt instrument, interest rate at period end | 1.50% |  |
Sum of LIBOR and margin, maximum rate | 2.62% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Line of credit facility, remaining borrowing capacity | $ 127,800 |  |
Amounts held at LIBOR plus margin | 39,000 |  |
Notes, loans and leases payable | $ 166,800 |  |
Debt instruments, issuance and maturity dates: |  |  |
Mortgage loans on real estate, final maturity date | Apr. 30, 2023 |  |
Debt instrument, maturity date | Aug. 31, 2018 |  |
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 |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior Mortgages [Member] | Amerco Real Estate Co and Uhaul International, Inc [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable | $ 1,366,200 |  |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date range, start | Jan. 01, 2022 |  |
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 | 3.72% |  |
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] | Working capital loans two [Member] | AMERCO [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 1.01% |  |
Applicable margin interest rate | 1.50% |  |
Sum of LIBOR and margin, maximum rate | 2.51% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Line of credit facility, maximum borrowing capacity | $ 85,000 |  |
Line of credit facility, remaining borrowing capacity | $ 85,000 |  |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date | Nov. 30, 2018 |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Revolving fleet loan one [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 1.04% |  |
LIBOR - highest rate | 1.15% |  |
Debt instrument, interest rate at period end | 2.19% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount | $ 150,000 |  |
Line of credit facility, maximum borrowing capacity | 225,000 |  |
Line of credit, current borrowing capacity | $ 150,000 |  |
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 | 1.05% |  |
LIBOR - highest rate | 1.15% |  |
Debt instrument, interest rate at period end | 2.20% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount | $ 150,000 |  |
Line of credit facility, maximum borrowing capacity | 190,000 |  |
Line of credit, current borrowing capacity | $ 150,000 |  |
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 | 1.05% |  |
LIBOR - highest rate | 1.15% |  |
Debt instrument, interest rate at period end | 2.20% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount | $ 150,000 |  |
Line of credit, current borrowing capacity | $ 123,000 |  |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date | Nov. 30, 2021 |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | Amerco Real Estate Co and Uhaul International, Inc [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR | 1.05% |  |
LIBOR - highest rate | 1.16% |  |
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 | $ 341,300 |  |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date range, start | Jul. 01, 2017 |  |
Debt instrument, maturity date range, end | Jun. 30, 2024 |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | Amerco Real Estate Co and Uhaul International, Inc [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] | Amerco Real Estate Co and Uhaul International, Inc [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] | Amerco Real Estate Co and Uhaul International, Inc [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Amount held at fixed interest rates | $ 276,000 |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) second loan [Member] | Amerco Real Estate Co and Uhaul International, Inc [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] | Amerco Real Estate Co and Uhaul International, Inc [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] | Uhaul International, Inc [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 | $ 50,100 |  |
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 | $ 74,400 |  |
Subsidiary holdings of parent company debt | $ 4,200 |  |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date range, start | Jan. 01, 2017 |  |
Debt instrument, maturity date range, end | Dec. 31, 2047 |  |
Amerco, Us Bank, National Association, Trustee [Member] | Other Obligations [Member] | Minimum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage | 2.75% |  |
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] |  |  |
Initial deposit amount |  | $ 45,000 |
Initial deposit interest rate |  | 1.00% |
Initial deposit maturity date |  | Sep. 29, 2017 |
Additional deposit amount |  | $ 15,000 |
Additional deposit interest rate |  | 1.75% |
Additional advance maturity date |  | Mar. 30, 2020 |
Available for sale equity securities, noncurrent |  | $ 129,000 |
Available for sale equity securities pledged as collateral |  | $ 68,600 |

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