Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Mar. 31, 2022
ASSETS:
Cash and cash equivalents	$ 2,060,524	$ 2,704,137
Reinsurance recoverables and trade receivables, net	189,498	229,343
Inventories, net	151,474	158,888
Prepaid expenses	241,711	236,915
Investments, fixed maturities and marketable equities	2,770,394	2,893,399
Investments, other	575,540	543,755
Deferred policy acquisition costs, net	152,377	103,828
Other assets	51,052	60,409
Right of use assets, financing, net	474,765	620,824
Right of use assets, operating	58,917	74,382
Related party assets	48,308	47,851
Subtotal assets	6,774,560	7,673,731
Property, plant and equipment, at cost:
Land	1,537,206	1,283,142
Buildings and improvements	7,088,810	5,974,639
Furniture and equipment	928,241	846,132
Property, plant and equipment (gross)	15,660,293	13,358,406
Less: Accumulated depreciation	(4,310,205)	(3,732,556)
Total property, plant and equipment	11,350,088	9,625,850
Total assets	18,124,648	17,299,581
Liabilities:
Accounts payable and accrued expenses	761,039	677,785
Notes, loans and leases payable	6,108,042	6,022,497
Operating lease liabilities	58,373	74,197
Finance Lease Liability	223,205
Policy benefits and losses, claims and loss expenses payable	875,034	890,254
Liabilities from investment contracts	2,398,884	2,336,238
Other policyholders' funds and liabilities	8,232	10,812
Deferred income	52,282	49,157
Deferred income taxes, net	1,334,427	1,286,149
Total liabilities	11,596,313	11,347,089
Commitments and contingencies (notes 9, 16, 17 and 18)
Stockholders' equity:
Additional paid-in capital	453,643	453,819
Accumulated other comprehensive loss	(267,046)	46,384
Retained earnings	7,008,715	6,119,442
Total stockholders' equity	6,528,335	5,952,492
Total liabilities and stockholders' equity	18,124,648	17,299,581
Series A Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0	0
Series B Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0	0
Series A Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	0	0
Amerco Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	10,497	10,497
Nonvoting Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	176	0
Common Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	(525,653)	(525,653)
Preferred Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	(151,997)	(151,997)
Rental Trailers and Other Rental Equipment [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	827,696	615,679
Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 5,278,340	$ 4,638,814