Contingencies	12 Months Ended
Mar. 31, 2020
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 have adversely affected workforces, customers, consumer sentiment, economies and financial markets. During and subsequent to the fourth quarter of fiscal 2020, 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 depend upon numerous evolving factors that the Company is not able to predict at this time, including among others: customer initiated changes in behavior, actions that have been and continue to be taken by governmental entities, our workforce may be negatively impacted disrupting our ability to serve customers, any new information that may emerge concerning the severity and duration of COVID-19 and the reaction of capital markets. For April the two most significant effects that we have experienced are an approximate 30 % (unaudited) decline in self-moving equipment rental income along with a decrease of approximately $ 39.5 million (unaudited) in proceeds from the sales of rental equipment compared to April 2019. The decline in equipment rental revenue has been improving in May (unaudited). 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 2021. F- 42 amerco and consolidated subsidiaries notes to consolidated financial statements – (continued) 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. We continue to examine the impact the CARES Act may have on our business. To date we have availed ourselves of the provisions related to deferring certain payroll taxes, carrybacks of net operating losses, and will utilize the technical corrections to tax deprecation methods. We estimate that the net operating loss carrybacks combined with the depreciation adjustments for our fiscal 2020 federal income tax return will result in a refund of approximately $ 381 million, which 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 other 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, 2020

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 have adversely affected workforces, customers, consumer sentiment, economies and financial markets. During and subsequent to the fourth quarter of fiscal 2020, 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 depend upon numerous evolving factors that the Company is not able to predict at this time, including among others: customer initiated changes in behavior, actions that have been and continue to be taken by governmental entities, our workforce may be negatively impacted disrupting our ability to serve customers, any new information that may emerge concerning the severity and duration of COVID-19 and the reaction of capital markets. For April the two most significant effects that we have experienced are an approximate 30 % (unaudited) decline in self-moving equipment rental income along with a decrease of approximately $ 39.5 million (unaudited) in proceeds from the sales of rental equipment compared to April 2019. The decline in equipment rental revenue has been improving in May (unaudited). 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 2021. F- 42 amerco and consolidated subsidiaries notes to consolidated financial statements – (continued) 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. We continue to examine the impact the CARES Act may have on our business. To date we have availed ourselves of the provisions related to deferring certain payroll taxes, carrybacks of net operating losses, and will utilize the technical corrections to tax deprecation methods. We estimate that the net operating loss carrybacks combined with the depreciation adjustments for our fiscal 2020 federal income tax return will result in a refund of approximately $ 381 million, which 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 other 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.