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Borrowings (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2017
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | $ 3,422,077 |  |  | $ 3,422,077 |  | $ 3,262,880
Interest paid related to derivative contracts [Abstract] |  |  |  |  |  |
Interest paid in cash | 32,400 |  | $ 28,100 | 63,400 | $ 55,300 |
Real estate loan [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 140,287 |  |  | 140,287 |  | 169,289
Senior Mortgages [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 1,405,702 |  |  | 1,405,702 |  | 1,292,160
Working Capital Loans [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 55,000 |  |  | 55,000 |  | 85,000
Rental Truck (amortizing loans) First Loan [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 319,631 |  |  | 319,631 |  | 324,977
Fleet Loan Securitization [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 47,183 |  |  | 47,183 |  | 52,112
Capital Lease Obligations [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 962,140 |  |  | 962,140 |  | 876,828
Capital Lease Obligations [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | 962,100 |  |  | 962,100 |  | 876,800
New capital lease obligations, amount |  |  |  | 233,900 |  |
Capitalized assets, net book value | 1,367,000 |  |  | $ 1,367,000 |  | 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 | $ 72,005 |  |  | $ 72,005 |  | $ 69,867
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% |  |  | 6.93% |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 1.24% |  |  | 1.24% |  |
Applicable margin interest rate | 1.50% |  |  | 1.50% |  |
Sum of LIBOR and margin, maximum rate | 2.74% |  |  | 2.74% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Line of credit facility, remaining borrowing capacity | $ 63,100 |  |  | $ 63,100 |  |
Amounts held at LIBOR plus margin | 77,200 |  |  | 77,200 |  |
Notes, loans and leases payable | 140,300 |  |  | $ 140,300 |  |
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] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | $ 1,405,700 |  |  | $ 1,405,700 |  |
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] | 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] | 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 [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 1.24% |  |  | 1.24% |  |
Applicable margin interest rate | 1.50% |  |  | 1.50% |  |
Sum of LIBOR and margin, maximum rate | 2.74% |  |  | 2.74% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 55,000 |  |  | $ 55,000 |  |
Line of credit, current borrowing capacity | 55,000 |  |  | $ 55,000 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Nov. 30, 2018 |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Working Capital Loans Two [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Unused capacity fee |  |  |  | 0.30% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 300,000 |  |  | $ 300,000 |  |
Line of credit, current borrowing capacity | 150,000 |  |  | 150,000 |  |
Line of credit facility, remaining borrowing capacity | $ 150,000 |  |  | $ 150,000 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Sep. 30, 2020 |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Working Capital Loans Two [Member] | AMERCO [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Sum of LIBOR and margin, maximum rate | 1.38% |  |  | 1.38% |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Working Capital Loans Two [Member] | AMERCO [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Sum of LIBOR and margin, maximum rate | 1.50% |  |  | 1.50% |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Revolving fleet loans [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 1.24% |  |  | 1.24% |  |
Applicable margin interest rate | 1.15% |  |  | 1.15% |  |
Sum of LIBOR and margin, maximum rate | 2.39% |  |  | 2.39% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Debt instrument, original face amount | $ 490,000 |  |  | $ 490,000 |  |
Line of credit facility, maximum borrowing capacity | 565,000 |  |  | 565,000 |  |
Notes, loans and leases payable | 446,000 |  |  | $ 446,000 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity date range, start |  |  |  | Mar. 01, 2020 |  |
Debt instrument, maturity date range, end |  |  |  | Nov. 30, 2021 |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | $ 319,600 |  |  | $ 319,600 |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity date range, start |  |  |  | Jun. 01, 2018 |  |
Debt instrument, maturity date range, end |  |  |  | Jun. 30, 2024 |  |
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% |  |  | 2.82% |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 1.23% |  |  | 1.23% |  |
Applicable margin interest rate | 1.72% |  |  | 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 | 4.76% |  |  | 4.76% |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 1.24% |  |  | 1.24% |  |
Applicable margin interest rate | 2.38% |  |  | 2.38% |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) Second loan [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | $ 260,700 |  |  | $ 260,700 |  |
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% |  |  | 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 | 3.94% |  |  | 3.94% |  |
Uhaul S Fleet Two Thousand Ten Box Truck Note [Member] | Fleet Loan Securitization [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 | 47,200 |  |  | $ 47,200 |  |
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 | 76,100 |  |  | $ 76,100 |  |
Subsidiary holdings of parent company debt | $ 4,100 |  |  | $ 4,100 |  |
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% |  |  | 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% |  |  | 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 |  | $ 130,200 |  |  |  |
Available for sale equity securities pledged as collateral |  | $ 69,300 |  |  |  |

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