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Borrowings (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2022
Jun. 30, 2022
Debt instruments, face, payment, and remaining balance amount:            
New capital lease obligiations, amount $ 100,000          
Notes, loans and leases payable $ 6,298,831   $ 6,298,831   $ 6,022,497  
Debt instruments, issuance and maturity dates:            
Remaining Lease Term Finance Lease Weighted Average 2       3  
Interest paid related to derivative contracts [Abstract]            
Interest paid in cash $ 63,100 $ 40,800 105,400 $ 81,700    
Federal Home Loan Bank, Advances, Activity for the year [Abstract]            
Available For Sale Securities Debt Securities 2,552,311   2,552,311   $ 2,821,092  
Finance Lease [Member] | AMERCO [Member]            
Debt instruments, face, payment, and remaining balance amount:            
Capitalized assets, net book value $ 529,000   $ 529,000   620,800  
Lease Cost [Abstract]            
Sale Leaseback Transaction Lease Terms (7) year terms          
Finance Lease [Member] | AMERCO [Member] | Minimum [Member]            
Debt instruments, interest rate, stated percentage:            
Debt instrument, interest rate, stated percentage 2.16%   2.16%      
Finance Lease [Member] | AMERCO [Member] | Maximum [Member]            
Debt instruments, interest rate, stated percentage:            
Debt instrument, interest rate, stated percentage 5.04%   5.04%      
Capital Lease Obligations [Member] | AMERCO [Member]            
Debt instruments, face, payment, and remaining balance amount:            
Capitalized assets, net book value $ 1,369,800   $ 1,369,800   $ 1,068,300  
Lease Cost [Abstract]            
Sale Leaseback Transaction Lease Terms seven (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 5.55%   5.55%      
Private Placement | AMERCO [Member]            
Debt instruments, face, payment, and remaining balance amount:            
Debt instrument, face amount $ 600,000   $ 600,000      
Line of credit, current borrowing capacity 150,000   150,000      
Line of credit facility, remaining borrowing capacity 150,000   150,000      
Amount held at fixed interest rates $ 100,000   $ 100,000      
Private Placement | AMERCO [Member] | Minimum [Member]            
Debt instruments, interest rate, stated percentage:            
Debt instrument, interest rate, stated percentage 2.43%   2.43%      
Debt instruments, interest rate, effective percentage:            
Applicable margin interest rate 2.55%   2.55%      
Debt instruments, issuance and maturity dates:            
Debt instrument, maturity year 2030          
Private Placement | AMERCO [Member] | Maximum [Member]            
Debt instruments, interest rate, stated percentage:            
Debt instrument, interest rate, stated percentage 2.78%   2.78%      
Debt instruments, interest rate, effective percentage:            
Applicable margin interest rate 2.88%   2.88%      
Debt instruments, issuance and maturity dates:            
Debt instrument, maturity year 2035          
Other Obligations [Member] | AMERCO [Member]            
Debt instruments, face, payment, and remaining balance amount:            
Debt instrument, face amount $ 80,700   $ 80,700      
Subsidiary holdings of parent company debt $ 1,800   $ 1,800      
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] | SOFR            
Debt instruments, interest rate, stated percentage:            
Debt instrument, interest rate, stated percentage 4.29%   4.29%      
Debt instruments, interest rate, effective percentage:            
Applicable margin interest rate 0.10%   0.10%      
Debt instruments, face, payment, and remaining balance amount:            
Debt instrument, face amount $ 210,600   $ 210,600      
Amount held at fixed interest rates $ 84,200   $ 84,200      
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] | Real estate loan [Member] | SOFR | Minimum [Member]            
Debt instruments, interest rate, effective percentage:            
Debt instrument, interest rate at period end 2.31%          
Applicable margin, per loan agreement, minimum rate 0.65%   0.65%      
Sum of LIBOR and margin, maximum rate 3.06%   3.06%      
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] | Real estate loan [Member] | SOFR | Maximum [Member]            
Debt instruments, interest rate, effective percentage:            
Debt instrument, interest rate at period end 2.51%          
Applicable margin, per loan agreement, maximum rate 1.38%   1.38%      
Sum of LIBOR and margin, maximum rate 3.99%   3.99%      
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior Mortgages [Member]            
Debt instruments, interest rate, effective percentage:            
Debt Weighted Average Interest Rate 4.09%   4.09%      
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] | Real estate loans (revolving credit) [Member]            
Debt instruments, interest rate, stated percentage:            
Debt instrument, interest rate, stated percentage 2.36%   2.36%      
Debt instruments, face, payment, and remaining balance amount:            
Debt instrument, face amount $ 615,000   $ 615,000      
Line of credit, current borrowing capacity 615,000   615,000      
Amount held at fixed interest rates $ 615,000   $ 615,000      
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Real estate loans (revolving credit) [Member] | Minimum [Member]            
Debt instruments, interest rate, effective percentage:            
Applicable margin interest rate 2.28%   2.28%      
Debt instrument, interest rate at period end 1.15%          
Sum of LIBOR and margin, maximum rate 3.53%   3.53%      
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Real estate loans (revolving credit) [Member] | Maximum [Member]            
Debt instruments, interest rate, effective percentage:            
Applicable margin interest rate 2.60%   2.60%      
Debt instrument, interest rate at period end 1.25%          
Sum of LIBOR and margin, maximum rate 3.95%   3.95%      
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 $ 150,000   $ 150,000      
Line of credit facility increase, amount 465,000          
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Rental Truck Revolvers [Member] | AMERCO [Member]            
Debt instruments, face, payment, and remaining balance amount:            
Debt instrument, face amount 150,000   150,000      
Notes, loans and leases payable $ 150,000   $ 150,000      
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Rental Truck Revolvers [Member] | AMERCO [Member] | Minimum [Member]            
Debt instruments, interest rate, effective percentage:            
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.26%   2.26%      
Applicable margin interest rate 1.40%   1.40%      
Sum of LIBOR and margin, maximum rate 3.76%   3.76%      
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Rental Truck Revolvers [Member] | AMERCO [Member] | Maximum [Member]            
Debt instruments, interest rate, effective percentage:            
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.52%   2.52%      
Applicable margin interest rate 1.50%   1.50%      
Sum of LIBOR and margin, maximum rate 4.02%   4.02%      
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 1.61%   1.61%      
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 4.99%   4.99%      
Life Insurance [Member] | Federal Home Loan Bank [Member]            
Federal Home Loan Bank, Advances, Activity for the year [Abstract]            
Aggregate deposit amount           $ 60,000
Available For Sale Securities Debt Securities           94,000
Available for sale equity securities pledged as collateral           $ 62,800
Life Insurance [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] | Federal Home Loan Bank [Member] | Maximum [Member]            
Federal Home Loan Bank, Advances, Activity for the year [Abstract]            
Deposit interest rate           1.72%