Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
ASSETS:
Cash and cash equivalents	$ 2,704,137	$ 1,194,012
Reinsurance recoverables and trade receivables, net	229,343	224,426
Inventories, net	158,888	105,577
Prepaid expenses	236,915	469,144
Investments, fixed maturities and marketable equities	2,893,399	2,695,656
Investments, other	543,755	489,759
Deferred policy acquisition costs, net	103,828	89,749
Other assets	60,409	47,730
Right of use assets, financing, net	620,824	877,038
Right of use assets, operating	74,382	92,505
Related party assets	47,851	35,395
Subtotal assets	7,673,731	6,320,991
Property, plant and equipment, at cost:
Land	1,283,142	1,075,813
Buildings and improvements	5,974,639	5,163,705
Furniture and equipment	846,132	786,505
Property, plant and equipment (gross)	13,358,406	11,413,668
Less: Accumulated depreciation	(3,732,556)	(3,083,053)
Total property, plant and equipment	9,625,850	8,330,615
Total assets	17,299,581	14,651,606
Liabilities:
Accounts payable and accrued expenses	677,785	645,575
Notes, loans and leases payable	6,022,497	4,668,907
Operating lease liabilities	74,197	92,510
Policy benefits and losses, claims and loss expenses payable	978,254	997,701
Liabilities from investment contracts	2,336,238	2,161,530
Other policyholders' funds and liabilities	10,812	12,420
Deferred income	49,157	42,592
Deferred income taxes, net	1,265,358	1,178,489
Total liabilities	11,414,298	9,799,724
Commitments and contingencies (notes 9, 16, 17 and 18)
Stockholders' equity:
Additional paid-in capital	453,819	453,819
Accumulated other comprehensive loss	46,384	106,857
Retained earnings	6,052,233	4,958,359
Total stockholders' equity	5,885,283	4,851,882
Total liabilities and stockholders' equity	17,299,581	14,651,606
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
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	615,679	477,921
Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 4,638,814	$ 3,909,724