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Borrowings (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016 | Mar. 31, 2016
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Notes, loans and leases payable | $ 3,198,435 |  |  | $ 3,198,435 |  |  | $ 2,665,396
Interest paid related to derivative contracts [Abstract] |  |  |  |  |  |  |
Interest paid in cash | 28,700 |  | $ 25,000 | 84,000 | $ 69,600 |  |
Real estate loan [Member] |  |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Notes, loans and leases payable | 171,789 |  |  | 171,789 |  |  | 205,000
Senior Mortgages [Member] |  |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Notes, loans and leases payable | 1,256,832 |  |  | 1,256,832 |  |  | 1,121,897
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 | 216,582 |  |  | 216,582 |  |  | 218,998
Rental Truck (securitizations) [Member] |  |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Notes, loans and leases payable | 53,876 |  |  | 53,876 |  |  | 62,838
Capital Lease Obligations [Member] |  |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Notes, loans and leases payable | 917,792 |  |  | 917,792 |  |  | 672,825
Capital Lease Obligations [Member] | AMERCO [Member] |  |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
New capital lease obligations, amount |  |  |  | 379,400 |  |  |
Notes, loans and leases payable | 917,800 |  |  | 917,800 |  |  |
Capitalized assets, net book value | 1,256,500 |  |  | $ 1,256,500 |  |  |
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 | $ 67,318 |  |  | $ 67,318 |  |  | $ 60,200
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% |  |  | 6.93% |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
LIBOR | 0.67% |  |  | 0.67% |  |  |
Applicable margin interest rate | 1.50% |  |  | 1.50% |  |  |
Debt instrument, interest rate at period end |  |  |  | 1.50% |  |  |
Sum of LIBOR and margin, maximum rate | 2.17% |  |  | 2.17% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Line of credit facility, remaining borrowing capacity | $ 131,100 |  |  | $ 131,100 |  |  |
Amounts held at LIBOR plus margin | 40,700 |  |  | 40,700 |  |  |
Notes, loans and leases payable | $ 171,800 |  |  | $ 171,800 |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Mortgage loans on real estate, final maturity date |  |  |  | Apr. 30, 2023 |  |  |
Debt instrument, maturity date |  |  |  | Aug. 31, 2018 |  |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior Mortgages [Member] | AMERCO Real Estate Co and Uhaul Int'l, Inc [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
LIBOR | 0.63% |  |  | 0.63% |  |  |
LIBOR - highest rate | 0.70% |  |  | 0.70% |  |  |
Applicable margin, per loan agreement, minimum rate | 2.00% |  |  | 2.00% |  |  |
Applicable margin, per loan agreement, maximum rate | 2.50% |  |  | 2.50% |  |  |
Sum of LIBOR and margin, minimum rate | 2.63% |  |  | 2.63% |  |  |
Sum of LIBOR and margin, maximum rate | 3.20% |  |  | 3.20% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Amounts held at LIBOR plus margin | $ 159,000 |  |  | $ 159,000 |  |  |
Notes, loans and leases payable | $ 1,256,800 |  |  | $ 1,256,800 |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity date range, start |  |  |  | Jan. 01, 2017 |  |  |
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 Int'l, Inc [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 3.72% |  |  | 3.72% |  |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior Mortgages [Member] | AMERCO Real Estate Co and Uhaul Int'l, Inc [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 5.50% |  |  | 5.50% |  |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Working Capital Loans Two [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
LIBOR | 0.74% |  |  | 0.74% |  |  |
LIBOR - highest rate | 1.50% |  |  | 1.50% |  |  |
Sum of LIBOR and margin, maximum rate | 2.24% |  |  | 2.24% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 85,000 |  |  | $ 85,000 |  |  |
Notes, loans and leases payable | $ 85,000 |  |  | $ 85,000 |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Nov. 30, 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% |  |  | 1.25% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 50,000 |  |  | $ 50,000 |  |  |
Line of credit, current borrowing capacity | $ 50,000 |  |  | $ 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 | 0.62% |  |  | 0.62% |  |  |
LIBOR - highest rate | 0.70% |  |  | 0.70% |  |  |
Applicable margin, per loan agreement, minimum rate | 1.72% |  |  | 1.72% |  |  |
Applicable margin, per loan agreement, maximum rate | 2.50% |  |  | 2.50% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Notes, loans and leases payable | $ 216,600 |  |  | $ 216,600 |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity date range, start |  |  |  | Jul. 01, 2017 |  |  |
Debt instrument, maturity date range, end |  |  |  | Sep. 30, 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% |  |  | 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% |  |  | 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 | $ 146,900 |  |  | $ 146,900 |  |  |
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% |  |  | 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% |  |  | 3.94% |  |  |
Uhaul Intl and Subsidiaries [Member] | Revolving fleet loan one [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
LIBOR | 0.61% |  |  | 0.61% |  |  |
Applicable margin interest rate | 1.15% |  |  | 1.15% |  |  |
Sum of LIBOR and margin, maximum rate | 1.76% |  |  | 1.76% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Debt instrument, original face amount | $ 150,000 |  |  | $ 150,000 |  |  |
Line of credit facility, maximum borrowing capacity | 225,000 |  |  | 225,000 |  |  |
Notes, loans and leases payable | $ 142,000 |  |  | $ 142,000 |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Sep. 30, 2018 |  |  |
Uhaul Intl and Subsidiaries [Member] | Revolving fleet loan two [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
LIBOR | 0.62% |  |  | 0.62% |  |  |
Applicable margin interest rate | 1.15% |  |  | 1.15% |  |  |
Sum of LIBOR and margin, maximum rate | 1.77% |  |  | 1.77% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Debt instrument, original face amount | $ 100,000 |  |  | $ 100,000 |  |  |
Line of credit facility, maximum borrowing capacity | 215,000 |  |  | 215,000 |  |  |
Notes, loans and leases payable | $ 147,000 |  |  | $ 147,000 |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Mar. 31, 2020 |  |  |
Uhaul Intl and Subsidiaries [Member] | Revolving fleet loan three [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
LIBOR | 0.61% |  |  | 0.61% |  |  |
Applicable margin interest rate | 1.85% |  |  | 1.85% |  |  |
Sum of LIBOR and margin, maximum rate | 2.46% |  |  | 2.46% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Debt instrument, original face amount | $ 50,000 |  |  | $ 50,000 |  |  |
Notes, loans and leases payable | $ 40,000 |  |  | $ 40,000 |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | May 31, 2019 |  |  |
Uhaul Intl and Subsidiaries [Member] | Revolving Fleet Loan Four [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
LIBOR | 0.62% |  |  | 0.62% |  |  |
Applicable margin interest rate | 1.15% |  |  | 1.15% |  |  |
Sum of LIBOR and margin, maximum rate | 1.77% |  |  | 1.77% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Debt instrument, original face amount | $ 125,000 |  |  | $ 125,000 |  |  |
Line of credit facility, maximum borrowing capacity | 150,000 |  |  | 150,000 |  |  |
Notes, loans and leases payable | $ 125,000 |  |  | $ 125,000 |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Nov. 30, 2021 |  |  |
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% |  |  | 4.90% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Debt instrument, original face amount | $ 155,000 |  |  | $ 155,000 |  |  |
Notes, loans and leases payable | 53,900 |  |  | $ 53,900 |  |  |
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 | 71,900 |  |  | $ 71,900 |  |  |
Subsidiary holdings of parent company debt | $ 4,600 |  |  | $ 4,600 |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity date range, start |  |  |  | Jan. 01, 2017 |  |  |
Debt instrument, maturity date range, end |  |  |  | Dec. 31, 2045 |  |  |
Debt instrument, issuance date |  |  |  | Feb. 28, 2011 |  |  |
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% |  |  | 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% |  |  | 8.00% |  |  |
Life Insurance [Member] | Federal Home Loan Bank [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  | 0.57% |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Deposit amount |  |  |  |  |  | $ 30,000 |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Deposit maturity date |  | Mar. 31, 2017 |  |  |  |  |

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