Borrowings	3 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
4. Borrowings	4. Borrowings Long Term Debt Long term debt was as follows:                       June 30,   March 31,   2022 Rates (a)     Maturities   2021   2021                 (Unaudited)                     (In thousands) Real estate loan (amortizing term)       1.60 %       2023 $ 55,257 $   82,913 Senior mortgages 2.80 % - 6.62 %   2021 - 2038   2,122,167   2,125,324 Real estate loans (revolving credit) (a) 1.47 % - 3.14 %   2023 - 2025   535,000   535,000 Fleet loans (amortizing term) 1.61 % - 4.66 %   2022 - 2028   162,528   176,295 Fleet loans (revolving credit) 1.24 %   1.34 %   2023 - 2025   553,000   535,000 Finance leases (rental equipment) 1.92 % - 5.04 %   2021 - 2026   468,484   513,623 Finance liability (rental equipment) 1.60 % - 4.22 %   2024   2029   718,585   644,375 Other obligations 1.75 % - 8.00 %   2021 - 2049   87,106   86,085 Notes, loans and finance leases payable                   4,702,127   4,698,615 Less: Debt issuance costs                     (28,744)   (29,708) Total notes, loans and finance leases payable, net         $ 4,673,383 $   4,668,907                             (a) Certain loans have interest rate swaps fixing the rate between 3.03% and 3.14% based on current margins.     Real Estate Backed Loans Real Estate Loan Real Estate and certain of its subsidiaries and U-Haul Company of Florida are borrowers under a real estate loan (the “Real Estate Loan”).   The Real Estate Loan requires monthly principal and interest payments, with the unpaid loan balance and accrued and unpaid interest due at maturity. The Real Estate Loan is secured by various properties owned by the borrowers.   The interest rate, per the provisions of the amended loan agreement, is the applicable London Inter-Bank Offer Rate (“LIBOR”) plus the applicable margin. As of June 30, 2021, the applicable LIBOR was 0.10 % and the applicable margin was 1.50 %, the sum of which was 1.60 %. The default provisions of the Real Estate Loan include non-payment of principal or interest and other standard reporting and change-in-control covenants. There are limited restrictions regarding our use of the funds. Senior Mortgages Various subsidiaries of Real Estate and U-Haul are borrowers under certain senior mortgages. The senior mortgages require monthly principal and interest payments. The senior mortgages are secured by certain properties owned by the borrowers. The fixed interest rates, per the provisions of the senior mortgages, range between 2.80 % and 6.62 %. The weighted average interest rate of these loans as of June 30, 2021 was 4.27 %.   Certain senior mortgages have an anticipated repayment date and a maturity date. If these senior mortgages are not repaid by the anticipated repayment date, the interest rate on these mortgages would increase from the current fixed rate. We are using the anticipated repayment date for our maturity schedule. Real Estate and U-Haul have provided limited guarantees of the senior mortgages. The default provisions of the senior mortgages include non-payment of principal or interest and other standard reporting and change-in-control covenants. There are limited restrictions regarding our use of the funds. Real Estate Loans (Revolving Credit) Various subsidiaries of Real Estate are borrowers under asset-backed real estate loans with an aggregate borrowing capacity of $385.0 million. As of June 30, 2021, the outstanding balance of these loans in the aggregate was $385.0 million. These loans are secured by certain properties owned by the borrowers. The loan agreements provide for term loans, subject to the terms of the loan agreements. The loans require monthly interest payments with the unpaid loan balance and accrued and unpaid interest due at maturity. The interest rate, per the provision of the loan agreements, is the applicable LIBOR plus the applicable margin. As of June 30, 2021, the applicable LIBOR was between 0.08% and 0.09% and the margin was between 1.25% and 1.50%, the sum of which was between 1.34% and 1.59%. AMERCO is the guarantor of these loans. The default provisions of the loan include non-payment of principal or interest and other standard reporting and change-in-control covenants.   AMERCO is a borrower under a real estate loan. The current maximum credit commitment is $ 200.0 million, which can be increased to $ 300.0 million by bringing in other lenders. As of June 30, 2021, the outstanding balance was $ 150.0 million. This loan agreement provides for revolving loans, subject to the terms of the loan agreement. This loan requires monthly interest payments with the unpaid loan balance and accrued and unpaid interest due at maturity. As of June 30, 2021, the applicable LIBOR was 0.09 % and the margin was 1.38 %, the sum of which was 1.47 %. The default provisions of the loan include non-payment of principal or interest and other standard reporting and change-in-control covenants. There is a 0.30 % fee charged for unused capacity. Fleet Loans Rental Truck Amortizing Loans The amortizing loans require monthly principal and interest payments, with the unpaid loan balance and accrued and unpaid interest due at maturity. These loans were used to purchase new trucks. The interest rates, per the provision of the loan agreements, are carried at fixed rates ranging between 1.61 % and 4.66 %. All of our rental truck amortizing loans are collateralized by the rental equipment purchased. The majority of these loans are funded at 70%, but some may be funded at 100%. AMERCO, and in some cases U-Haul, is guarantor of these loans. The default provisions of these loans include non-payment of principal or interest and other standard reporting and change-in-control covenants. Rental Truck Revolvers Various subsidiaries of U-Haul entered into three revolving fleet loans with an aggregate borrowing capacity of $ 590.0 million. The interest rates, per the provision of the loan agreements, are the applicable LIBOR plus the applicable margin. As of June 30, 2021, the applicable LIBOR was 0.09 % and the margin was between 1.15 % and 1.25 %, the sum of which was between 1.24 % and 1.34 %. Of the $ 535.0 million outstanding, $ 100.0 million is fixed with an interest rate of 2.36 %. Only interest is paid on the loans until the last nine months of the respective loan terms when principal becomes due monthly. Finance Leases The Finance Lease balance represents our sale-leaseback transactions of rental equipment that were entered into and classified as capital leases prior to the adoption of Topic 842. The historical capital lease balance was reclassified to Right-of-Use (“ROU”) assets-finance, net. The agreements are generally seven (7) year terms with interest rates ranging from 1.92 % to 5.04 %.   All of our finance leases are collateralized by our rental fleet. The net book value of the corresponding rental equipment was $ 804.1 million and $ 865.6 million as of June 30, 2021 and March 31, 2021, respectively. There were no new financing leases, as assessed under the new leasing guidance, entered into during the first quarter of fiscal 2022. Finance Liabilities Finance liabilities represent our rental equipment financing transactions that have historically been accounted for as capital leases prior to the adoption of ASC 842 which substantially changed the accounting for sale-leasebacks going forward. In accordance with the new leasing guidance, we assess if sale-leaseback transactions qualify as a sale at initiation by determining if a transfer of ownership occurs.   We have determined that our equipment sale-leasebacks do not qualify as a sale, as the buyer-lessors do not obtain control of the assets in our ongoing sale-leaseback arrangements. As a result, we expect future sale-leasebacks to be accounted for as a financial liability and the leased assets will be capitalized at cost.     Our finance liabilities have an average term of seven (7) years and interest rates ranging from 1.60 % to 4.22 %. These finance liabilities are collateralized by our rental fleet.   Other Obligations In February 2011, AMERCO and U.S. Bank, NA (the “Trustee”) entered into the U-Haul Investors Club ® Indenture.   AMERCO and the Trustee entered into this indenture to provide for the issuance of notes by us directly to investors over our proprietary website, uhaulinvestorsclub.com (“U-Notes ® ”). The U-Notes ® are secured by various types of collateral including, but not limited to, rental equipment and real estate.   U-Notes ® are issued in smaller series that vary as to principal amount, interest rate and maturity.   U-Notes ® are obligations of the Company and secured by the associated collateral; they are not guaranteed by any of the Company’s affiliates or subsidiaries. As of June 30, 2021, the aggregate outstanding principal balance of the U-Notes® issued was $89.5 million, of which $2.4 million is held by our insurance subsidiaries and eliminated in consolidation. Interest rates range between 1.75% and 8.00% and maturity dates range between 2021 and 2049.   Oxford is a member of the Federal Home Loan Bank (“FHLB”) and, as such, the FHLB has made advances to Oxford. As of March 31, 2021, the advances had an aggregate balance of $ 70.5 million, for which Oxford pays fixed interest rates between 0.00 % and 1.72 % with maturities between June 8, 2021 and September 29, 2025. As of March 31, 2021, available-for-sale investments held with the FHLB totaled $ 134.3 million, of which $ 79.3 million were pledged as collateral to secure the outstanding advances. The balances of these advances are included within Liabilities from investment contracts on the condensed consolidated balance sheets.   Annual Maturities of Notes, Loans and Finance Leases Payable The annual maturities of our notes, loans and finance leases payable, as of June 30, 2021 for the next five years and thereafter are as follows:     Years Ending June 30,     2022   2023   2024   2025   2026   Thereafter     (Unaudited)     (In thousands) Notes, loans and finance leases payable, secured $ 510,380 $ 673,861 $ 1,152,549 $ 561,740 $ 410,089 $ 1,393,508 Interest on Borrowings Interest Expense Components of interest expense include the following:     Quarter Ended June 30,     2021   2020     (Unaudited)     (In thousands) Interest expense $ 38,935 $ 41,911 Capitalized interest   (2,030)   (4,434) Amortization of transaction costs   1,286   1,297 Interest expense resulting from cash flow hedges   987   747 Total interest expense $ 39,178 $ 39,521   Interest paid in cash, including payments related to derivative contracts, amounted to $ 36.1 million and $ 39.4 million for the first quarter of fiscal 2022 and 2021, respectively. Interest Rates Interest rates and Company borrowings were as follows:     Revolving Credit Activity       Quarter Ended June 30,       2021   2020       (Unaudited)       (In thousands, except interest rates)   Weighted average interest rate during the quarter   1.39 % 2.02 % Interest rate at the end of the quarter   1.38 % 1.67 % Maximum amount outstanding during the quarter $ 1,088,000 $ 1,175,000   Average amount outstanding during the quarter $ 1,073,055 $ 1,161,385   Facility fees $ 71 $ 4