Contingencies	12 Months Ended
Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Note 19. Contingencies COVID-19 In late 2019, COVID-19 was first detected in Wuhan, China. In March 2020, the World Health Organization declared COVID-19 a global pandemic, and governmental authorities around the world have implemented measures to reduce the spread of COVID-19. These measures along with the threat the virus poses have adversely affected workforces, customers, consumer sentiment, economies and financial markets. F- 40 amerco and consolidated subsidiaries notes to consolidated financial statements - (continued) During fiscal 2021, the Company has been impacted by the spread of COVID-19. The extent to which COVID-19 impacts the Company's business, operations and financial results will continue to evolve in ways that the Company is not fully able to predict at this time. We have experienced customer initiated changes in behavior, actions by government entities, concerns from our workforce, and reactions from the capital markets. Although the Company cannot estimate the length or gravity of the impact of COVID-19 at this time, if the pandemic continues, it may have a material adverse effect on the Company's results of future operations, financial position and liquidity in fiscal 2022 and beyond. CARES Act The CARES Act, among other things, includes provisions relating to refundable payroll tax credits, deferment of employer side social security payments, net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations, increased limitations on qualified charitable contributions, and technical corrections to tax depreciation methods for qualified improvement property. As a result of the federal income tax provisions of the CARES Act, we have filed applicable forms with the IRS to carryback net operating losses. These refund claims total approximately $ 366 million, none of which has been received at this time and are reflected in Prepaid expense. As refunds are received, they will reduce this amount. We have estimated and recorded the overall effects of the CARES Act and do not anticipate a material change. It is possible future legislation could reduce or delay our ability to carryback these losses. Environmental Compliance with environmental requirements of federal, state and local governments may significantly affect Real Estate's business operations. Among other things, these requirements regulate the discharge of materials into the air, land and water and govern the use and disposal of hazardous substances. Real Estate is aware of issues regarding hazardous substances on some of its properties. Real Estate regularly makes capital and operating expenditures to stay in compliance with environmental laws and has put in place a remedial plan at each site where it believes such a plan is necessary. Since 1988, Real Estate has managed a testing and removal program for underground storage tanks. Based upon the information currently available to Real Estate, compliance with the environmental laws and its share of the costs of investigation and cleanup of known hazardous waste sites are not expected to result in a material adverse effect on AMERCO's financial position or results of operations. Other We are named as a defendant in various litigation and claims arising out of the normal course of business. In management's opinion, none of these other matters will have a material effect on our financial position and results of operations.

Contingencies

12 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Note 19. Contingencies COVID-19 In late 2019, COVID-19 was first detected in Wuhan, China. In March 2020, the World Health Organization declared COVID-19 a global pandemic, and governmental authorities around the world have implemented measures to reduce the spread of COVID-19. These measures along with the threat the virus poses have adversely affected workforces, customers, consumer sentiment, economies and financial markets. F- 40 amerco and consolidated subsidiaries notes to consolidated financial statements - (continued) During fiscal 2021, the Company has been impacted by the spread of COVID-19. The extent to which COVID-19 impacts the Company's business, operations and financial results will continue to evolve in ways that the Company is not fully able to predict at this time. We have experienced customer initiated changes in behavior, actions by government entities, concerns from our workforce, and reactions from the capital markets. Although the Company cannot estimate the length or gravity of the impact of COVID-19 at this time, if the pandemic continues, it may have a material adverse effect on the Company's results of future operations, financial position and liquidity in fiscal 2022 and beyond. CARES Act The CARES Act, among other things, includes provisions relating to refundable payroll tax credits, deferment of employer side social security payments, net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations, increased limitations on qualified charitable contributions, and technical corrections to tax depreciation methods for qualified improvement property. As a result of the federal income tax provisions of the CARES Act, we have filed applicable forms with the IRS to carryback net operating losses. These refund claims total approximately $ 366 million, none of which has been received at this time and are reflected in Prepaid expense. As refunds are received, they will reduce this amount. We have estimated and recorded the overall effects of the CARES Act and do not anticipate a material change. It is possible future legislation could reduce or delay our ability to carryback these losses. Environmental Compliance with environmental requirements of federal, state and local governments may significantly affect Real Estate's business operations. Among other things, these requirements regulate the discharge of materials into the air, land and water and govern the use and disposal of hazardous substances. Real Estate is aware of issues regarding hazardous substances on some of its properties. Real Estate regularly makes capital and operating expenditures to stay in compliance with environmental laws and has put in place a remedial plan at each site where it believes such a plan is necessary. Since 1988, Real Estate has managed a testing and removal program for underground storage tanks. Based upon the information currently available to Real Estate, compliance with the environmental laws and its share of the costs of investigation and cleanup of known hazardous waste sites are not expected to result in a material adverse effect on AMERCO's financial position or results of operations. Other We are named as a defendant in various litigation and claims arising out of the normal course of business. In management's opinion, none of these other matters will have a material effect on our financial position and results of operations.