Statutory Financial Information of Insurance Subsidiaries	12 Months Ended
	Mar. 31, 2022
Disclosure Text Block [Abstract]
Statutory Financial Information of Insurance Subsidiaries	Note 20.   Statutory Financial Information of Insurance Subsidiaries Applicable laws and regulations of the States of Arizona and Nevada require Property and Casualty Insurance and Life Insurance to maintain minimum capital and surplus determined in accordance with statutory accounting principles. Audited statutory net income and statutory capital and surplus for the years ended are listed below:     Years Ended December 31,     2021   2020   2019     (In thousands) Repwest:             Audited statutory net income $ 33,314 $ 22,898 $ 28,614 Audited statutory capital and surplus   266,875   227,380   226,999 ARCOA:             Audited statutory net income (loss)   (752)   2,438   2,906 Audited statutory capital and surplus   14,697   15,928   12,851 Oxford:             Audited statutory net income   23,217   6,296   18,599 Audited statutory capital and surplus   230,202   218,301   223,264 CFLIC:             Audited statutory net income   6,019   8,082   8,043 Audited statutory capital and surplus   17,098   25,980   26,305 NAI:             Audited statutory net income   1,874   2,127   1,942 Audited statutory capital and surplus   7,961   13,980   13,371 The amount of dividends that can be paid to shareholders by insurance companies domiciled in the State of Arizona is limited. There are restrictions on the ability of our insurance subsidiaries to transfer funds to us in the form of cash dividends, loans or advances. Their ordinary dividends are limited to the lower of 10% of prior year statutory surplus or prior year net income. Any extraordinary dividend, loans or advances to us from the insurance subsidiaries must be approved by the domiciliary insurance commissioner. Any dividend in excess of the limit requires prior regulatory approval. The statutory surplus for Repwest at December 31, 2021 that could be distributed as ordinary dividends was $26.7 million. The statutory surplus for Oxford at December 31, 2021 that could be distributed as ordinary dividends was $23.0 million. Repwest paid a dividend of $ $22.6 million and $21.6 million to AMERCO during fiscal 2021 and 2020, respectively. Repwest did not pay a dividend to AMERCO in fiscal 2022. Oxford paid a dividend of $18.6 million to AMERCO during fiscal 2021.  Oxford did not pay a dividend to AMERCO in   fiscal 2022 or 2020. Restricted net assets for our insurance subsidiaries were $ 91.7 million and $ 105.4 million as of December 31, 2021 and 2020, respectively. For our insurance subsidiaries, statutory accounting principles (“SAP”) differ from GAAP primarily in that: (i) premiums from deferred annuities are recognized as revenue under SAP, while they are accounted for as liabilities from investment contracts under GAAP; (ii) policy acquisition costs are expensed as incurred under SAP, while they are deferred and amortized over the effective period of the related life insurance policies or the present value of actual and expected gross profits from annuity deposits; (iii) policy benefits and losses are established using different actuarial assumptions; and (iv) investments are valued on a different basis and valuation allowances attributable to investments are different. In addition, certain assets are not admitted under SAP and are charged directly to surplus.