Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Mar. 31, 2022
ASSETS:
Cash and cash equivalents	$ 2,510,619	$ 2,704,137
Reinsurance recoverables and trade receivables, net	208,182	229,343
Inventories, net	150,140	158,888
Prepaid expenses	228,260	236,915
Investments, fixed maturities and marketable equities	2,723,201	2,893,399
Investments, other	518,455	543,755
Deferred policy acquisition costs, net	159,924	103,828
Other assets	57,272	60,409
Right of use Assets - Financing	504,640	620,824
Right of use Assets - Operating	63,856	74,382
Related party assets	75,549	47,851
Subtotal assets	7,200,098	7,673,731
Property, plant and equipment, at cost:
Land	1,504,507	1,283,142
Buildings and improvements	6,728,424	5,974,639
Furniture and equipment	898,468	846,132
Property, plant and equipment (gross)	15,082,961	13,358,406
Less: Accumulated depreciation	(4,166,731)	(3,732,556)
Total property, plant and equipment	10,916,230	9,625,850
Total assets	18,116,328	17,299,581
Liabilities:
Accounts payable and accrued expenses	703,412	677,785
Notes, loans and leases payable	6,200,397	6,022,497
Financing lease liability	252,102
Operating lease liability	63,402	74,197
Policy benefits and losses, claims and loss expenses payable	980,200	978,254
Liabilities from investment contracts	2,396,702	2,336,238
Other policyholders' funds and liabilities	12,579	10,812
Deferred income	45,222	49,157
Deferred income taxes, net	1,301,037	1,265,358
Total liabilities	11,702,951	11,414,298
Commitments and contingencies (notes 4, 8 and 9)
Stockholders' equity:
Common stock, value, issued	176
Additional paid-in capital	453,643	453,819
Accumulated other comprehensive loss	(284,116)	46,384
Retained earnings	6,910,827	6,052,233
Total stockholders' equity	6,413,377	5,885,283
Total liabilities and stockholders' equity	18,116,328	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
Serial 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	784,394	615,679
Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 5,167,168	$ 4,638,814