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Leases (Finance Leases Weighted Average Remaining Lease Term and Discount Rate) (Details)	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Finance Leases Weighted Average Remaining Lease Term And Discount Rate [Abstract]
Remaining Lease Term Finance Lease Weighted Average	0.6	1
Finance Lease Weighted Average Discount Rate Percent	4.40%	4.10%

X

- Definition

Finance Leases Weighted Average Remaining Lease Term And Discount Rate Abstract

+ References

No definition available.

+ Details

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Namespace Prefix:	uhal_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average remaining lease term for finance lease.

+ References

No definition available.

+ Details

Name:	uhal_RemainingLeaseTermFinanceLeaseWeightedAverage
Namespace Prefix:	uhal_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average discount rate for finance lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (g)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant