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Borrowings (Narratives) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | $ 3,262,880 | $ 2,647,396
Mortgages [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | $ 169,289 | 205,000
Mortgages [Member] | Minimum [Member] |  |  |
Debt instruments, issuance and maturity dates: |  |  |
Mortgage loans on real estate, final maturity date |  | Dec. 31, 2017 |
Mortgages [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 |  | $ 1,292,160 | 1,103,897
Working Capital Loans [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | 85,000 |
Rental Truck (amortizing loans) First Loan [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | 324,977 | 218,998
Rental Truck (securitizations) [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | 52,112 | 62,838
Capital Lease Obligations [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Notes, loans and leases payable |  | 876,828 | 672,825
Capital Lease Obligations [Member] | Amerco [Member] |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |
New capital lease obligations, amount |  | 446,800 |
Notes, loans and leases payable |  | 876,800 | 672,800
Capitalized assets, net book value |  | $ 1,233,300 | 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 |  | $ 69,867 | $ 60,200
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 |  | 0.86% |
Applicable margin interest rate |  | 1.50% |
Debt instrument at period end, LIBOR plus margin |  | 1.50% |
Sum of LIBOR and margin, maximum rate |  | 2.36% |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Amounts held at LIBOR plus margin |  | $ 39,900 |
Line of credit facility, remaining borrowing capacity |  | 129,400 |
Notes, loans and leases payable |  | $ 169,300 |
Debt instruments, issuance and maturity dates: |  |  |
Mortgage loans on real estate, final maturity date |  | Apr. 30, 2023 |
Derivative, Maturity Date |  | Aug. 30, 2018 |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior mortgages [Member] | Uhaul International, Inc and AMERCO [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR |  | 0.83% |
LIBOR - highest rate |  | 0.86% |
Sum of LIBOR and margin, minimum rate |  | 2.83% |
Sum of LIBOR and margin, maximum rate |  | 3.36% |
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 |  | $ 157,300 |
Notes, loans and leases payable |  | $ 1,292,200 |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date range, start |  | Dec. 31, 2017 |
Debt instrument, maturity date range, end |  | Dec. 31, 2038 |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior mortgages [Member] | Uhaul International, Inc and AMERCO [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] | Uhaul International, Inc and AMERCO [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 |  | 0.78% |
Applicable margin interest rate |  | 1.15% |
Sum of LIBOR and margin, maximum rate |  | 1.93% |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount |  | $ 150,000 |
Line of credit facility, maximum borrowing capacity |  | 225,000 |
Notes, loans and leases payable |  | $ 142,000 |
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 |  | 0.78% |
Applicable margin interest rate |  | 1.15% |
Sum of LIBOR and margin, maximum rate |  | 1.93% |
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 |  | $ 140,000 |
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 |  | 0.78% |
Applicable margin interest rate |  | 1.85% |
Sum of LIBOR and margin, maximum rate |  | 2.63% |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount |  | $ 50,000 |
Notes, loans and leases payable |  | $ 25,000 |
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 |  | 0.78% |
Applicable margin interest rate |  | 1.15% |
Sum of LIBOR and margin, maximum rate |  | 1.93% |
Debt instruments, face, payment, and remaining balance amount: |  |  |
Debt instrument, original face amount |  | $ 150,000 |
Notes, loans and leases payable |  | $ 110,000 |
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 |
Amerco Real Estate Company [Member] | Working capital loans two [Member] | Amerco [Member] |  |  |
Debt instruments, interest rate, effective percentage: |  |  |
LIBOR |  | 0.98% |
Applicable margin interest rate |  | 1.50% |
Sum of LIBOR and margin, maximum rate |  | 2.48% |
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 |
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 |  | 0.78% |
LIBOR - highest rate |  | 0.91% |
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 |  | $ 325,000 |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date range, start |  | Jul. 01, 2017 |
Debt instrument, maturity date range, end |  | Mar. 31, 2024 |
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: |  |  |
Notes, loans and leases payable |  | $ 257,500 |
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] |  |  |
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 |  | $ 52,100 |
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 |  | $ 74,300 |
Subsidiary holdings of parent company debt |  | $ 4,400 |
Debt instruments, issuance and maturity dates: |  |  |
Debt instrument, maturity date range, start |  | Dec. 31, 2017 |
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] | FHLB [Member] |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |
Deposit amount | $ 30,000 | $ 45,000 |
Deposit interest rate | 0.57% | 1.00% |
Deposit maturity date | Mar. 30, 2017 | Sep. 29, 2017 |
Available for sale equity securities, noncurrent | $ 92,000 |  |
Available for sale equity securities pledged as collateral | $ 33,700 |  |
Additional deposit amount |  | $ 15,000 |
Fixed interest rate on additional deposit |  | 1.75% |
Maturity date for additional deposit |  | Mar. 30, 2020 |

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