Schedule V - U-Haul Holding Company and Consolidated Subsidiaries, Supplemental Information (for Property-Casualty Insurance Operations) (Details) - Property Casualty Insurance Operations [Member] - U-Haul Holding Company [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplemental Information For Property And Casualty Insurance Underwriters [Abstract]
Deferred policy acquisition costs	$ 0	$ 0	$ 0
Reserves for unpaid claims and claims adjustment expense	151,874	159,162	177,963
Discount if any, deducted	0	0	0
Unearned premiums	(97)	334	(294)
Net earned premiums (1)	96,242	89,667	70,285
Net investment income (2)	7,314	24,385	16,335
Claim and claim adjustment expenses incurred related to current year	27,570	28,980	20,670
Prior years	(5,828)	(6,290)	(3,865)
Amortization of deferred policy acquisition costs	0	0	0
Paid claims and claim adjustment expense	22,965	24,012	25,759
Net premiums written (1)	$ 96,145	$ 90,002	$ 69,989