Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022
ASSETS:
Cash and cash equivalents	$ 3,098,271	$ 2,704,137
Reinsurance recoverables and trade receivables, net	219,574	229,343
Inventories, net	164,579	158,888
Prepaid expenses	231,714	236,915
Investments, fixed maturities and marketable equities	2,669,986	2,893,399
Investments, other	557,124	543,755
Deferred policy acquisition costs, net	129,568	103,828
Other assets	53,477	60,409
Right of use Assets - Financing	568,223	620,824
Right of use Assets - Operating	72,538	74,382
Related party assets	45,190	47,851
Subtotal assets	7,810,244	7,673,731
Property, plant and equipment, at cost:
Land	1,354,587	1,283,142
Buildings and improvements	6,154,373	5,974,639
Furniture and equipment	858,094	846,132
Property, plant and equipment (gross)	13,912,488	13,358,406
Less: Accumulated depreciation	(3,891,128)	(3,732,556)
Total property, plant and equipment	10,021,360	9,625,850
Total assets	17,831,604	17,299,581
Liabilities:
Accounts payable and accrued expenses	722,617	677,785
Notes, loans and leases payable	6,232,564	6,022,497
Financing lease liability	312,411
Operating lease liability	72,277	74,197
Policy benefits and losses, claims and loss expenses payable	988,030	978,254
Liabilities from investment contracts	2,374,250	2,336,238
Other policyholders' funds and liabilities	11,999	10,812
Deferred income	63,647	49,157
Deferred income taxes, net	1,292,369	1,265,358
Total liabilities	11,757,753	11,414,298
Commitments and contingencies (notes 4, 8 and 9)
Stockholders' equity:
Additional paid-in capital	453,819	453,819
Accumulated other comprehensive loss	(89,246)	46,384
Retained earnings	6,376,431	6,052,233
Total stockholders' equity	6,073,851	5,885,283
Total liabilities and stockholders' equity	17,831,604	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
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	671,880	615,679
Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 4,873,554	$ 4,638,814