Borrowings	12 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
Borrowings	Note 9.   Borrowings Long-Term Debt Long-term debt was as follows:                     March 31,   2023 Rates   Maturities   2023   2022                     (In thousands) Real estate loan (amortizing term) (a) 4.29 % - 6.14 % 2027   2037 $ 289,647 $ 50,259 Senior mortgages 2.70 % - 5.50 % 2024 - 2042   2,371,231   2,206,268 Real estate loans (revolving credit) – % - – %     2027   –   535,000 Fleet loans (amortizing term) 1.61 % - 5.68 % 2023 - 2029   111,856   124,651 Fleet loans (revolving credit) 2.36 % - 5.97 % 2025 - 2027   615,000   560,000 Finance leases (rental equipment) 2.18 % - 5.04 % 2023 - 2026   223,205   347,393 Finance liability (rental equipment) 1.60 % - 5.98 % 2024 - 2031   1,255,763   949,936 Private placements 2.43 % - 2.88 % 2029 - 2035   1,200,000   1,200,000 Other obligations 1.50 % - 8.00 % 2023 - 2049   76,648   86,206 Notes, loans and finance leases payable                 $ 6,143,350 $ 6,059,713 Less: Debt issuance costs                   (35,308)   (37,216) Total notes, loans and finance leases payable, net         $ 6,108,042 $ 6,022,497                           (a) Certain loans have interest rate swaps fixing the rate between 2.72% and 2.86% based on current margin         Real Estate Backed Loans Real Estate Loan Certain subsidiaries of Real Estate and U-Haul Company of Florida are borrowers under real estate loans. These loans require monthly or quarterly principal and interest payments, with the unpaid loan balance and accrued and unpaid interest due at maturity. These loans are secured by various properties owned by the borrowers. The interest rates, per the provisions of $ 206.3 million of these loans, are the applicable Secured Overnight Funding Rate (“SOFR”) plus the applicable margins and a credit spread adjustment of 0.10 %. As of March 31, 2023, the applicable SOFR was between 4.62 % and 4.83 % and applicable margin was between 0.65 % and 1.38 %, the sum of which, including the credit spread, was between 5.58 % and 6.14 %. The remaining $ 83.3 million of these loans was fixed with an interest rate of 4.29 %. The default provisions of these real estate loans include non-payment of principal or interest and other standard reporting and change-in-control covenants. We are in compliance with the covenants as of March 31, 2023. 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 2.70% and 5.50%. The weighted average interest rate of these loans as of March 31, 2023 was 4.09%.  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. We are in compliance with the covenants as of March 31, 2023. There are limited restrictions regarding our use of the funds. Real Estate Loans (Revolving Credit) U-Haul Holding Company is a borrower under a multi-bank syndicated real estate loan. As of March 31, 2023, the maximum credit commitment is $ 465.0 million. As of March 31, 2023, the full capacity was available to borrow. 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. The default provisions of the loan include non-payment of principal or interest and other standard reporting and change-in-control covenants. We are in compliance with the covenants as of March 31, 2023. There is a 0.30 % fee charged for unused capacity. This loan was amended in October 2022 and the maximum credit limit was increased from $ 150 million to $ 465 million, the maturity extended to October 2027 and LIBOR based rates were replaced with SOFR based rates. 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 5.68 %.   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%. U-Haul Holding Company, 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. We are in compliance with the covenants as of March 31, 2023. The net book value of the corresponding rental equipment was $213.1 million and $253.3 million as of March 31, 2023 and 2022, respectively. Rental Truck Revolvers Various subsidiaries of U-Haul entered into three revolving fleet loans with an aggregate borrowing capacity of $ 615.0 million. The aggregate outstanding balance for these revolvers as of March 31, 2023 was $ 615.0 million. The interest rates, per the provision of the loan agreements, are SOFR plus the applicable margin and a credit spread adjustment of 0.10 %. As of March 31, 2023, SOFR was between 4.52 % and 4.67 % and the margin was between 1.15 % and 1.25 %, the sum of which, including the credit spread, was between 5.77 % and 5.97 %. Of the $ 615.0 million outstanding, $ 100.0 million was 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. The default provisions of the loan include non-payment of principal or interest and other standard reporting and change-in-control covenants. We are in compliance with the covenants as of March 31, 2023. These fleet loans are collateralized by the rental equipment purchased. The net book value of the corresponding rental equipment was $822.0 million and $654.6 million as of March 31, 2023 and 2022, respectively. Finance Leases The Finance Lease balance represents our sale-leaseback transactions of rental equipment. The agreements are generally seven (7) year terms with interest rates ranging from 2.18% to 5.04%.  All of our finance leases are collateralized by our rental fleet. The net book value of the corresponding rental equipment was $474.8 million and $620.8 million as of March 31, 2023 and March 31, 2022, respectively. There were no new financing leases, as assessed under the new leasing guidance, entered into during fiscal 2023. The default provisions of the loan include non-payment of principal or interest and other standard reporting and change-in-control covenants. We are in compliance with the covenants as of March 31, 2023. Finance Liabilities Finance liabilities represent our rental equipment financing transactions, and we assess if these 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, these sale-leasebacks are accounted for as a financial liability and the leased assets are capitalized at cost.     Our finance liabilities have an average term of seven (7) years and interest rates ranging from 1.60 % to 5.98 %. These finance liabilities are collateralized by the related assets of our rental fleet.   The net book value of the corresponding rental equipment was $1,499.1 million and $1,068.3 million as of March 31, 2023 and March 31, 2022, respectively. The default provisions of the loan include non-payment of principal or interest and other standard reporting and change-in-control covenants. We are in compliance with the covenants as of March 31, 2023. Private Placements In September 2021, U-Haul Holding Company entered into a note purchase agreement to issue $ 600.0 million of fixed rate senior unsecured notes in a private placement offering.   These notes consist of four tranches each totaling $ 150.0 million and funded in September 2021.   The fixed interest rates range between 2.43 % and 2.78 % with maturities between 2029 and 2033 .   Interest is payable semiannually. The default provisions of the loan include non-payment of principal or interest and other standard reporting and change-in-control covenants. We are in compliance with the covenants as of March 31, 2023. In December 2021, U-Haul Holding Company entered into a note purchase agreement to issue $ 600.0 million of fixed rate senior unsecured notes in a private placement offering. These notes consist of three tranches each totaling $ 100.0 million and two tranches each totaling $ 150.0 million.   The fixed interest rates range between 2.55 % and 2.88 % with maturities between 2030 and 2035 .   Interest is payable semiannually. The default provisions of the loan include non-payment of principal or interest and other standard reporting and change-in-control covenants. We are in compliance with the covenants as of March 31, 2023. Other Obligations In February 2011, U-Haul Holding Company and U.S. Bank Trust Company, NA, as successor in interest to U.S. Bank National Association (the “Trustee”), entered into the U-Haul Investors Club ® Indenture.   U-Haul Holding Company 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, certain 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 March 31, 2023, the aggregate outstanding principal balance of the U-Notes ® issued was $ 78.4 million, of which $ 1.7 million is held by our insurance subsidiaries and eliminated in consolidation. Interest rates range between 1.50 % and 8.00 % and maturity dates range between 2023 and 2049 . Oxford is a member of the Federal Home Loan Bank (“FHLB”) and, as such, the FHLB has made deposits with Oxford. As of December 31, 2022, the deposits had an aggregate balance of $60.0 million, with an availability of $78.9 million, for which Oxford pays fixed interest rates between 0.49% and 4.21% with maturities between March 30, 2023 and September 30, 2027. As of December 31, 2022, available-for-sale investments held with the FHLB totaled $88.4 million, of which $62.8 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, before debt issuance costs, as of March 31, 2023 for the next five years and thereafter are as follows:     Years Ended March 31,     2024   2025   2026   2027   2028   Thereafter   Total     (In thousands) Notes, loans and finance leases payable, secured $ 563,153 $ 698,301 $ 667,490 $ 819,153 $ 647,409 $ 2,747,844 $ 6,143,350