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Borrowings (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable $ 3,586,127 $ 3,513,076  
Interest paid related to derivative contracts [Abstract]      
Interest paid in cash 34,400   $ 31,000
Real estate loan [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable 132,787 135,287  
Senior Mortgages [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable 1,519,614 1,487,645  
Working Capital Loans [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable 75,000 55,000  
Rental Truck (amortizing loans) First Loan [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable 332,236 342,971  
Capital Lease Obligations [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable 1,029,405 984,217  
Capital Lease Obligations [Member] | AMERCO [Member]      
Debt instruments, face, payment, and remaining balance amount:      
New capital lease obligiations, amount 126,900    
Notes, loans and leases payable 1,029,400 984,200  
Capitalized assets, net book value $ 1,479,400 1,407,600  
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 $ 72,978 73,579  
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%    
Debt instruments, interest rate, effective percentage:      
LIBOR 2.05%    
Applicable margin interest rate 1.50%    
Debt instrument, interest rate at period end 1.50%    
Sum of LIBOR and margin, maximum rate 3.55%    
Debt instruments, face, payment, and remaining balance amount:      
Line of credit facility, remaining borrowing capacity $ 60,600    
Amounts held at LIBOR plus margin 72,200    
Notes, loans and leases payable $ 132,800    
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 International, Inc [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable $ 1,519,600    
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date range, start Jan. 01, 2021    
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 International, Inc [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] | Amerco Real Estate Co and Uhaul International, Inc [Member] | Maximum [Member]      
Debt instruments, interest rate, stated percentage:      
Debt instrument, interest rate, stated percentage 6.62%    
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Working Capital Loans [Member] | AMERCO [Member]      
Debt instruments, interest rate, effective percentage:      
LIBOR 1.98%    
Applicable margin interest rate 1.38%    
Sum of LIBOR and margin, maximum rate 3.36%    
Debt instruments, face, payment, and remaining balance amount:      
Line of credit facility, maximum borrowing capacity $ 85,000    
Line of credit facility, remaining borrowing capacity $ 75,000    
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date Jun. 30, 2021    
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Working capital loans two [Member] | AMERCO [Member]      
Debt instruments, interest rate, effective percentage:      
Applicable margin, per loan agreement, minimum rate 1.38%    
Applicable margin, per loan agreement, maximum rate 1.50%    
Unused capacity fee 0.30%    
Debt instruments, face, payment, and remaining balance amount:      
Line of credit facility, maximum borrowing capacity $ 300,000    
Line of credit, current borrowing capacity 150,000    
Line of credit facility, remaining borrowing capacity $ 150,000    
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date Sep. 30, 2020    
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | Amerco Real Estate Co and Uhaul International, Inc [Member]      
Debt instruments, interest rate, effective percentage:      
LIBOR 1.98%    
LIBOR - highest rate 2.07%    
Applicable margin, per loan agreement, minimum rate 1.72%    
Applicable margin, per loan agreement, maximum rate 2.25%    
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable $ 332,200    
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date range, start Sep. 01, 2018    
Debt instrument, maturity date range, end Jun. 30, 2025    
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | Amerco Real Estate Co and Uhaul International, Inc [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] | Amerco Real Estate Co and Uhaul International, Inc [Member] | Maximum [Member]      
Debt instruments, interest rate, stated percentage:      
Debt instrument, interest rate, stated percentage 4.11%    
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) second loan [Member] | Amerco Real Estate Co and Uhaul International, Inc [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Amount held at fixed interest rates $ 286,600    
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) second loan [Member] | Amerco Real Estate Co and Uhaul International, Inc [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] | Amerco Real Estate Co and Uhaul International, Inc [Member] | Maximum [Member]      
Debt instruments, interest rate, stated percentage:      
Debt instrument, interest rate, stated percentage 4.66%    
Uhaul Intl and Subsidiaries [Member] | Rental Truck Revolvers [Member]      
Debt instruments, interest rate, effective percentage:      
LIBOR 1.98%    
Applicable margin interest rate 1.15%    
Sum of LIBOR and margin, maximum rate 3.13%    
Debt instruments, face, payment, and remaining balance amount:      
Debt instrument, original face amount $ 510,000    
Line of credit facility, maximum borrowing capacity 565,000    
Notes, loans and leases payable $ 450,000    
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date range, start Jan. 01, 2021    
Debt instrument, maturity date range, end Jul. 31, 2022    
Amerco, Us Bank, National Association, Trustee [Member] | Other Obligations [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable $ 76,500    
Subsidiary holdings of parent company debt $ 3,500    
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date range, start Jan. 01, 2018    
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%    
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] | 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   125,000  
Available for sale equity securities pledged as collateral   $ 72,400  
Life Insurance [Member] | Federal Home Loan Bank [Member] | Minimum [Member]      
Federal Home Loan Bank, Advances, Activity for the year [Abstract]      
Deposit interest rate   1.48%  
Deposit maturity date   Sep. 29, 2018  
Life Insurance [Member] | Federal Home Loan Bank [Member] | Maximum [Member]      
Federal Home Loan Bank, Advances, Activity for the year [Abstract]      
Deposit interest rate   2.67%  
Deposit maturity date   Mar. 31, 2021