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Borrowings (Narratives) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | $ 4,163,323 | $ 3,513,076
Real estate loan (amortizing term) [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | $ 102,913 | 135,287
Real estate loan (amortizing term) [Member] | Minimum [Member] |  |  |
Debt instruments, issuance and maturity dates: |  |  |
Mortgage loans on real estate, final maturity date |  | Jan. 01, 2019 |
Real estate loan (amortizing term) [Member] | Maximum [Member] |  |  |
Debt instruments, issuance and maturity dates: |  |  |
Mortgage loans on real estate, final maturity date |  | Dec. 31, 2036 |
Senior mortgages [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | $ 1,741,652 | 1,487,645
Real estate loans (revolving credit) [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | 429,400 | 55,000
Rental Truck (amortizing loans) First Loan [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | 263,209 | 342,971
Capital Lease Obligations [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | 1,042,652 | 984,217
Other Obligations [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | $ 82,417 | 73,579
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] | Real estate loan (amortizing term) [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR |  | 2.49% |
Applicable margin interest rate |  | 1.50% |
Sum of LIBOR and margin, maximum rate |  | 3.99% |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior mortgages [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] | Maximum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage |  | 6.62% |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Real estate loans (revolving credit) [Member] | Amerco [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Aggregate borrowing capacity, amount |  | $ 335,000 |
Notes, loans and leases payable |  | $ 329,400 |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date range, start |  | Jun. 01, 2021 |
Debt instrument, maturity date range, end |  | Feb. 28, 2024 |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Real estate loans (revolving credit) [Member] | Amerco [Member] | Minimum [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR |  | 2.49% |
Applicable margin interest rate |  | 1.25% |
Sum of LIBOR and margin, maximum rate |  | 3.74% |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Real estate loans (revolving credit) [Member] | Amerco [Member] | Maximum [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR |  | 2.50% |
Applicable margin interest rate |  | 1.50% |
Sum of LIBOR and margin, maximum rate |  | 3.99% |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Real estate loans two (revolving credit) [Member] | Amerco [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR |  | 2.49% |
Applicable margin interest rate |  | 1.38% |
Sum of LIBOR and margin, maximum rate |  | 3.87% |
Unused capacity fee |  | 0.30% |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount |  | $ 150,000 |
Line of credit facility, maximum borrowing capacity |  | 300,000 |
Notes, loans and leases payable |  | $ 100,000 |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date |  | Sep. 30, 2021 |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | Amerco [Member] | Minimum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage |  | 2.82% |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR |  | 2.48% |
Applicable margin interest rate |  | 1.72% |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | Amerco [Member] | Maximum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage |  | 3.00% |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR |  | 2.49% |
Applicable margin interest rate |  | 1.75% |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) Second Loan [Member] | Amerco [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Amount held at fixed interest rate |  | $ 241,400 |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) Second Loan [Member] | 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] | Amerco [Member] | Maximum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage |  | 4.66% |
Uhaul Intl and Subsidiaries [Member] | Rental Truck Revolvers [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR |  | 2.49% |
Applicable margin interest rate |  | 1.15% |
Sum of LIBOR and margin, maximum rate |  | 3.64% |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Aggregate borrowing capacity, amount |  | $ 555,000 |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date |  | May 31, 2024 |
Uhaul Intl and Subsidiaries [Member] | Capital Lease Obligations [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
New capital lease obligations, amount |  | $ 348,400 |
Capitalized assets, net book value |  | $ 1,574,000 | $ 1,407,600
Uhaul Intl and Subsidiaries [Member] | Capital Lease Obligations [Member] | Minimum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage |  | 1.92% |
Uhaul Intl and Subsidiaries [Member] | Capital Lease Obligations [Member] | Maximum [Member] |  |  |
Debt instruments, interest rate, stated percentage: |  |  |
Debt instrument, interest rate, stated percentage |  | 5.04% |
Amerco, Us Bank, National Association, Trustee [Member] | Other Obligations [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | $ 85,600 |
Subsidiary holdings of parent company debt |  | $ 3,200 |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date range, start |  | Jan. 01, 2019 |
Debt instrument, maturity date range, end |  | Dec. 31, 2048 |
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] | FHLB [Member] |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |
Deposit amount | $ 60,000 |  |
Deposit earliest maturity date | Sep. 29, 2019 |  |
Deposit latest maturity date | Mar. 29, 2021 |  |
Available for sale equity securities, noncurrent | $ 124,400 |  |
Available for sale equity securities pledged as collateral | $ 69,800 |  |
Life Insurance [Member] | FHLB [Member] | Minimum [Member] |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |
Deposit interest rate | 1.67% |  |
Life Insurance [Member] | FHLB [Member] | Maximum [Member] |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |
Deposit interest rate | 2.95% |  |

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