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Borrowings (Narratives) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Dec. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable   $ 3,262,880 $ 2,647,396
Mortgages [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable   $ 169,289 205,000
Mortgages [Member] | Minimum [Member]      
Debt instruments, issuance and maturity dates:      
Mortgage loans on real estate, final maturity date   Dec. 31, 2017  
Mortgages [Member] | Maximum [Member]      
Debt instruments, issuance and maturity dates:      
Mortgage loans on real estate, final maturity date   Dec. 31, 2036  
Senior mortgages [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable   $ 1,292,160 1,103,897
Working Capital Loans [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable   85,000
Rental Truck (amortizing loans) First Loan [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable   324,977 218,998
Rental Truck (securitizations) [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable   52,112 62,838
Capital Lease Obligations [Member]      
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable   876,828 672,825
Capital Lease Obligations [Member] | Amerco [Member]      
Debt instruments, face, payment, and remaining balance amount:      
New capital lease obligations, amount   446,800  
Notes, loans and leases payable   876,800 672,800
Capitalized assets, net book value   $ 1,233,300 900,600
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   $ 69,867 $ 60,200
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] | Mortgages [Member] | Uhual International, Inc [Member]      
Debt instruments, interest rate, stated percentage:      
Debt instrument, interest rate, stated percentage   6.93%  
Debt instruments, interest rate, effective percentage:      
LIBOR   0.86%  
Applicable margin interest rate   1.50%  
Debt instrument at period end, LIBOR plus margin   1.50%  
Sum of LIBOR and margin, maximum rate   2.36%  
Debt instruments, face, payment, and remaining balance amount:      
Amounts held at LIBOR plus margin   $ 39,900  
Line of credit facility, remaining borrowing capacity   129,400  
Notes, loans and leases payable   $ 169,300  
Debt instruments, issuance and maturity dates:      
Mortgage loans on real estate, final maturity date   Apr. 30, 2023  
Derivative, Maturity Date   Aug. 30, 2018  
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior mortgages [Member] | Uhaul International, Inc and AMERCO [Member]      
Debt instruments, interest rate, effective percentage:      
LIBOR   0.83%  
LIBOR - highest rate   0.86%  
Sum of LIBOR and margin, minimum rate   2.83%  
Sum of LIBOR and margin, maximum rate   3.36%  
Applicable margin, per loan agreement, minimum rate   2.00%  
Applicable margin, per loan agreement, maximum rate   2.50%  
Debt instruments, face, payment, and remaining balance amount:      
Amounts held at LIBOR plus margin   $ 157,300  
Notes, loans and leases payable   $ 1,292,200  
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date range, start   Dec. 31, 2017  
Debt instrument, maturity date range, end   Dec. 31, 2038  
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior mortgages [Member] | Uhaul International, Inc and AMERCO [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] | Uhaul International, Inc and AMERCO [Member] | Maximum [Member]      
Debt instruments, interest rate, stated percentage:      
Debt instrument, interest rate, stated percentage   5.50%  
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Revolving Fleet Loan One [Member]      
Debt instruments, interest rate, effective percentage:      
LIBOR   0.78%  
Applicable margin interest rate   1.15%  
Sum of LIBOR and margin, maximum rate   1.93%  
Debt instruments, face, payment, and remaining balance amount:      
Debt instrument, original face amount   $ 150,000  
Line of credit facility, maximum borrowing capacity   225,000  
Notes, loans and leases payable   $ 142,000  
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date   Sep. 30, 2018  
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Revolving Fleet Loan Two [Member]      
Debt instruments, interest rate, effective percentage:      
LIBOR   0.78%  
Applicable margin interest rate   1.15%  
Sum of LIBOR and margin, maximum rate   1.93%  
Debt instruments, face, payment, and remaining balance amount:      
Debt instrument, original face amount   $ 100,000  
Line of credit facility, maximum borrowing capacity   215,000  
Notes, loans and leases payable   $ 140,000  
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date   Mar. 31, 2020  
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Revolving Fleet Loan Three [Member]      
Debt instruments, interest rate, effective percentage:      
LIBOR   0.78%  
Applicable margin interest rate   1.85%  
Sum of LIBOR and margin, maximum rate   2.63%  
Debt instruments, face, payment, and remaining balance amount:      
Debt instrument, original face amount   $ 50,000  
Notes, loans and leases payable   $ 25,000  
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date   May 31, 2019  
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Revolving Fleet Loan Four [Member]      
Debt instruments, interest rate, effective percentage:      
LIBOR   0.78%  
Applicable margin interest rate   1.15%  
Sum of LIBOR and margin, maximum rate   1.93%  
Debt instruments, face, payment, and remaining balance amount:      
Debt instrument, original face amount   $ 150,000  
Notes, loans and leases payable   $ 110,000  
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date   Nov. 30, 2021  
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%  
Debt instruments, face, payment, and remaining balance amount:      
Line of credit facility, maximum borrowing capacity   $ 50,000  
Line of credit facility, remaining borrowing capacity   $ 50,000  
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date   Sep. 30, 2018  
Amerco Real Estate Company [Member] | Working capital loans two [Member] | Amerco [Member]      
Debt instruments, interest rate, effective percentage:      
LIBOR   0.98%  
Applicable margin interest rate   1.50%  
Sum of LIBOR and margin, maximum rate   2.48%  
Debt instruments, face, payment, and remaining balance amount:      
Line of credit facility, maximum borrowing capacity   $ 85,000  
Line of credit facility, remaining borrowing capacity   $ 85,000  
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date   Nov. 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   0.78%  
LIBOR - highest rate   0.91%  
Applicable margin, per loan agreement, minimum rate   1.72%  
Applicable margin, per loan agreement, maximum rate   2.50%  
Debt instruments, face, payment, and remaining balance amount:      
Notes, loans and leases payable   $ 325,000  
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date range, start   Jul. 01, 2017  
Debt instrument, maturity date range, end   Mar. 31, 2024  
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%  
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%  
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   $ 257,500  
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%  
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%  
Uhaul S Fleet Two Thousand Ten Box Truck Note [Member]      
Debt instruments, interest rate, stated percentage:      
Debt instrument, interest rate, stated percentage   4.90%  
Debt instruments, face, payment, and remaining balance amount:      
Debt instrument, original face amount   $ 155,000  
Notes, loans and leases payable   $ 52,100  
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   $ 74,300  
Subsidiary holdings of parent company debt   $ 4,400  
Debt instruments, issuance and maturity dates:      
Debt instrument, maturity date range, start   Dec. 31, 2017  
Debt instrument, maturity date range, end   Dec. 31, 2045  
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%  
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] | FHLB [Member]      
Federal Home Loan Bank, Advances, Activity for the year [Abstract]      
Deposit amount $ 30,000 $ 45,000  
Deposit interest rate 0.57% 1.00%  
Deposit maturity date Mar. 30, 2017 Sep. 29, 2017  
Available for sale equity securities, noncurrent $ 92,000    
Available for sale equity securities pledged as collateral $ 33,700    
Additional deposit amount   $ 15,000  
Fixed interest rate on additional deposit   1.75%  
Maturity date for additional deposit   Mar. 30, 2020