Document and Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2024	May 29, 2024	May 24, 2024	Sep. 30, 2023
Document and Entity Information [Abstract]
Entity Registrant Name	U-Haul Holding Company
Entity Central Index Key	0000004457
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Public Float				$ 5,109,248,015
Document Fiscal Year Focus	2024
Document Type	10-K
Document Fiscal Period Focus	FY
Document Period End Date	Mar. 31, 2024
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity File Number	001-11255
Entity Tax Identification Number	88-0106815
Entity Address Address Line 1	5555 Kietzke Lane
Entity Address Address Line 2	Ste. 100
Entity Address City Or Town	Reno
Entity Address State Or Province	NV
Entity Address Postal Zip Code	89511
City Area Code	775
Local Phone Number	688-6300
Entity Interactive Data Current	Yes
Entity Incorporation State Country Code	NV
Document Annual Report	true
Document Transition Report	false
Auditor Name	Deloitte & Touche, LLP
Auditor Location	Phoenix, Arizona
Auditor Firm ID	34
Nonvoting Common Stock [Member]
Document and Entity Information [Abstract]
Entity Common Stock, Shares Outstanding			176,470,092
Security 12b Title	Series N Non-Voting Common Stock, $0.001 par value
Trading Symbol	UHAL.B
Security Exchange Name	NYSE
Common Stock [Member]
Document and Entity Information [Abstract]
Entity Common Stock, Shares Outstanding		19,607,788
Security 12b Title	Common stock, $0.25 par value
Trading Symbol	UHAL
Security Exchange Name	NYSE