Borrowings (Table Text Block)	3 Months Ended
Jun. 30, 2022
Debt Instruments [Abstract]
Long-Term Debt	June 30, March 31, 2023 Rates Maturities 2022 2022 (Unaudited) (In thousands) Real estate loans (amortizing term) 2.27 % - 2.70 % 2023 - 2037 $ 87,147 $ 50,259 Senior mortgages 2.70 % - 5.50 % 2023 - 2042 2,322,293 2,206,268 Real estate loans (revolving credit) (a) 2.31 % - 2.56 % 2023 - 2025 535,000 535,000 Fleet loans (amortizing term) 1.61 % - 4.66 % 2022 - 2029 119,576 124,651 Fleet loans (revolving credit) 1.90 % - 2.36 % 2025 - 2027 560,000 560,000 Finance leases (rental equipment) 2.16 % - 5.04 % 2022 - 2026 312,411 347,393 Finance liabilities (rental equipment) 1.60 % - 4.77 % 2024 - 2030 1,051,917 949,936 Private placements 2.43 % - 2.88 % 2029 - 2035 1,200,000 1,200,000 Other obligations 1.50 % - 8.00 % 2022 - 2049 81,008 86,206 Notes, loans and finance leases payable 6,269,352 6,059,713 Less: Debt issuance costs (36,788) (37,216) Total notes, loans and finance leases payable, net $ 6,232,564 $ 6,022,497 (a) A certain loan has an interest rate swap fixing the rate at 3.14% based on current margins.
Annual Maturities of Notes, Loans and Leases Payable	Years Ending June 30, 2023 2024 2025 2026 2027 Thereafter Total (Unaudited) (In thousands) Notes, loans and finance leases payable, secured$ 502,394 $ 1,059,057 $ 648,440 $ 638,221 $ 671,424 $ 2,749,816 $ 6,269,352
Components of interest expense	Quarter Ended June 30, 2022 2021 (Unaudited) (In thousands) Interest expense $ 50,405 $ 38,935 Capitalized interest (2,618) (2,030) Amortization of transaction costs 1,446 1,286 Interest expense resulting from cash flow hedges 566 987 Total interest expense$ 49,799 $ 39,178
Interest rates and company borrowings	Revolving Credit Activity Quarter Ended June 30, 2022 2021 (Unaudited) (In thousands, except interest rates) Weighted average interest rate during the quarter 1.99 % 1.39 % Interest rate at the end of the quarter 2.29 % 1.38 % Maximum amount outstanding during the quarter $ 1,095,000 $ 1,088,000 Average amount outstanding during the quarter $ 1,095,000 $ 1,073,055 Facility fees$ 58 $ 71

Our disclosure provides for only the interest expense on borrowings. Within the US-GAAP taxonomy, there is an Interest Income and Interest Expense Disclosure [Text Block], but nothing that specifically covers only Interest Expense.

No definition available.

+ Details

Name:	uhal_InterestExpenseDisclosureTextBlock
Namespace Prefix:	uhal_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfDebtTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

- Definition

Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

- Definition

Tabular disclosure of maturity and sinking fund requirement for long-term debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601

+ Details

Name:	us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration