Stockholders' Equity - Summary of Dividends Declared (Details) - $ / shares	9 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Common Stock [Member] \| Dividends Declared Two [Member]
Dividends Stock [Abstract]
Dividends Payable, Date Declared	Aug. 18, 2022	Aug. 18, 2022
Dividend paid, amount per share	$ 0.5	$ 0.5
Dividends Payable, Date of Record	Sep. 06, 2022	Sep. 06, 2022
Dividends Payable, Date to be Paid	Sep. 20, 2022	Sep. 20, 2022
Common Stock [Member] \| Dividends Declared Three [Member]
Dividends Stock [Abstract]
Dividends Payable, Date Declared	Apr. 06, 2022	Apr. 06, 2022
Dividend paid, amount per share	$ 0.5	$ 0.5
Dividends Payable, Date of Record	Apr. 18, 2022	Apr. 18, 2022
Dividends Payable, Date to be Paid	Apr. 29, 2022	Apr. 29, 2022
Nonvoting Common Stock [Member] \| Dividend Declared One [Member]
Dividends Stock [Abstract]
Dividends Payable, Date Declared	Dec. 06, 2023	Dec. 06, 2023
Dividend paid, amount per share	$ 0.05	$ 0.05
Dividends Payable, Date of Record	Dec. 18, 2023	Dec. 18, 2023
Dividends Payable, Date to be Paid	Dec. 29, 2023	Dec. 29, 2023
Nonvoting Common Stock [Member] \| Dividends Declared Two [Member]
Dividends Stock [Abstract]
Dividends Payable, Date Declared	Aug. 17, 2023	Aug. 17, 2023
Dividend paid, amount per share	$ 0.04	$ 0.04
Dividends Payable, Date of Record	Sep. 19, 2023	Sep. 19, 2023
Dividends Payable, Date to be Paid	Sep. 29, 2023	Sep. 29, 2023
Nonvoting Common Stock [Member] \| Dividends Declared Three [Member]
Dividends Stock [Abstract]
Dividends Payable, Date Declared	Jun. 07, 2023	Jun. 07, 2023
Dividend paid, amount per share	$ 0.04	$ 0.04
Dividends Payable, Date of Record	Jun. 20, 2023	Jun. 20, 2023
Dividends Payable, Date to be Paid	Jun. 30, 2023	Jun. 30, 2023
Nonvoting Common Stock [Member] \| Dividends Declared Four [Member]
Dividends Stock [Abstract]
Dividends Payable, Date Declared	Dec. 07, 2022	Dec. 07, 2022
Dividend paid, amount per share	$ 0.04	$ 0.04
Dividends Payable, Date of Record	Dec. 19, 2022	Dec. 19, 2022
Dividends Payable, Date to be Paid	Dec. 30, 2022	Dec. 30, 2022

Aggregate dividends paid during the period for each share of common stock outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

+ Details

Name:	us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the declared dividend will be paid, in YYYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-3

+ Details

Name:	us-gaap_DividendPayableDateToBePaidDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the dividend to be paid was declared, in YYYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DividendsPayableDateDeclaredDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the holder must own the stock to be entitled to the dividend, in YYYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=uhal_DividendsDeclaredTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=uhal_DividendsDeclaredThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_NonvotingCommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=us-gaap_DividendDeclaredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=uhal_DividendsDeclaredFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: