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Borrowings (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Mar. 31, 2021
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | $ 5,397,856 |  | $ 5,397,856 |  |  | $ 4,668,907
Interest paid related to derivative contracts [Abstract] |  |  |  |  |  |
Interest paid in cash | 35,400 | $ 38,400 | $ 106,900 | $ 116,900 |  |
Real estate loan [Member] |  |  |  |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2023 |  |  |
Real estate loans (revolving credit) [Member] |  |  |  |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2025 |  |  |
Finance Lease [Member] |  |  |  |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2029 |  |  |
Finance Lease [Member] | AMERCO [Member] |  |  |  |  |  |
Lease Cost [Abstract] |  |  |  |  |  |
Sale Leaseback Transaction Lease Terms |  |  | (7) year terms |  |  |
Finance Lease [Member] | AMERCO [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Capitalized assets, net book value | $ 692,800 |  | $ 692,800 |  |  |
Finance Lease [Member] | AMERCO [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 5.04% |  | 5.04% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Capitalized assets, net book value | $ 877,000 |  | $ 877,000 |  |  |
Capital Lease Obligations [Member] | AMERCO [Member] |  |  |  |  |  |
Lease Cost [Abstract] |  |  |  |  |  |
Sale Leaseback Transaction Lease Terms |  |  | (7) years |  |  |
Capital Lease Obligations [Member] | AMERCO [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 1.60% |  | 1.60% |  |  |
Capital Lease Obligations [Member] | AMERCO [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 4.22% |  | 4.22% |  |  |
Private Placement [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Amounts held at LIBOR plus margin | $ 100,000 |  | $ 100,000 |  | $ 150,000 |
New capital lease obligiations, amount | 600,000 |  | $ 600,000 |  |  |
Line of credit facility increase, amount | $ 150,000 |  |  |  |  |
Private Placement [Member] | AMERCO [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 2.55% |  | 2.55% |  | 2.43% |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year | 2030 |  |  |  |  |
Private Placement [Member] | AMERCO [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 2.88% |  | 2.88% |  | 2.78% |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year | 2035 |  |  |  |  |
Other Obligations [Member] | AMERCO [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 1.50% |  | 1.50% |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2022 |  |  |
Other Obligations [Member] | AMERCO [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 8.00% |  | 8.00% |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2049 |  |  |
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] | Real estate loan [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Applicable margin interest rate | 1.50% |  | 1.50% |  |  |
Sum of LIBOR and margin, maximum rate | 1.61% |  | 1.61% |  |  |
Amerco Real Estate Company [Member] | Rental Truck (amortizing loans) First Loan [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 1.61% |  | 1.61% |  |  |
Amerco Real Estate Company [Member] | Rental Truck (amortizing loans) First Loan [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 4.66% |  | 4.66% |  |  |
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 | 2.70% |  | 2.70% |  |  |
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 two [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Line of credit, current borrowing capacity | $ 385,000 |  | $ 385,000 |  |  |
Notes, loans and leases payable | $ 385,000 |  | $ 385,000 |  |  |
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: |  |  |  |  |  |
Applicable margin interest rate | 1.25% |  | 1.25% |  |  |
Sum of LIBOR and margin, maximum rate | 1.34% |  | 1.34% |  |  |
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: |  |  |  |  |  |
Applicable margin interest rate | 1.50% |  | 1.50% |  |  |
Sum of LIBOR and margin, maximum rate | 1.59% |  | 1.59% |  |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Rental Truck Revolvers [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 375,000 |  | $ 375,000 |  |  |
Line of credit, current borrowing capacity | 590,000 |  | 590,000 |  |  |
Notes, loans and leases payable | $ 550,000 |  | $ 550,000 |  |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Rental Truck Revolvers [Member] | AMERCO [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 0.09% |  | 0.09% |  |  |
Applicable margin interest rate | 1.15% |  | 1.15% |  |  |
Sum of LIBOR and margin, maximum rate | 1.25% |  | 1.25% |  |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Rental Truck Revolvers [Member] | AMERCO [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 0.10% |  | 0.10% |  |  |
Applicable margin interest rate | 1.25% |  | 1.25% |  |  |
Sum of LIBOR and margin, maximum rate | 1.34% |  | 1.34% |  |  |
Uhaul Intl and Subsidiaries [Member] | Real estate loans (revolving credit) [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Applicable margin interest rate | 1.38% |  | 1.38% |  |  |
Sum of LIBOR and margin, maximum rate | 1.47% |  | 1.47% |  |  |
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 | 200,000 |  | 200,000 |  |  |
Line of credit facility, remaining borrowing capacity | $ 150,000 |  | $ 150,000 |  |  |
Uhaul Intl and Subsidiaries [Member] | Real estate loans (revolving credit) [Member] | AMERCO [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
LIBOR | 0.09% |  | 0.09% |  |  |
Amerco, Us Bank, National Association, Trustee [Member] | Other Obligations [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Debt instrument, face amount | $ 90,100 |  | $ 90,100 |  |  |
Subsidiary holdings of parent company debt | $ 2,300 |  | $ 2,300 |  |  |
Life Insurance [Member] | Other Obligations [Member] | Federal Home Loan Bank [Member] |  |  |  |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |  |  |  |
Aggregate deposit amount |  |  |  |  | $ 60,000 |
Available for sale equity securities, noncurrent |  |  |  |  | 110,000 |
Available for sale equity securities pledged as collateral |  |  |  |  | $ 66,500 |
Life Insurance [Member] | Other Obligations [Member] | Federal Home Loan Bank [Member] | Minimum [Member] |  |  |  |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |  |  |  |
Deposit interest rate |  |  |  |  | 0.49% |
Life Insurance [Member] | Other Obligations [Member] | Federal Home Loan Bank [Member] | Maximum [Member] |  |  |  |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |  |  |  |
Deposit interest rate |  |  |  |  | 1.72% |

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