Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
ASSETS:
Cash and cash equivalents	$ 2,430,233	$ 1,194,012
Reinsurance recoverables and trade receivables, net	227,935	224,426
Inventories, net	142,955	105,577
Prepaid expenses	202,339	469,144
Investments, fixed maturities and marketable equities	2,845,147	2,695,656
Investments, other	571,942	489,759
Deferred policy acquisition costs, net	97,138	89,749
Other assets	51,626	47,730
Right of use Assets - Financing	752,990	877,038
Right of use Assets - Operating	85,237	92,505
Related party assets	38,773	35,395
Subtotal assets	7,446,315	6,320,991
Property, plant and equipment, at cost:
Land	1,172,648	1,075,813
Buildings and improvements	5,477,544	5,163,705
Furniture and equipment	811,337	786,505
Property, plant and equipment (gross)	12,277,075	11,413,668
Less: Accumulated depreciation	(3,386,162)	(3,083,053)
Total property, plant and equipment	8,890,913	8,330,615
Total assets	16,337,228	14,651,606
Liabilities:
Accounts payable and accrued expenses	694,284	645,575
Notes, loans and leases payable	5,335,278	4,668,907
Operating lease liability	85,199	92,510
Policy benefits and losses, claims and loss expenses payable	1,016,505	997,701
Liabilities from investment contracts	2,276,829	2,161,530
Other policyholders' funds and liabilities	10,943	12,420
Deferred income	51,212	42,592
Deferred income taxes, net	1,312,281	1,178,489
Total liabilities	10,782,531	9,799,724
Commitments and contingencies (notes 4, 8 and 9)
Stockholders' equity:
Additional paid-in capital	453,819	453,819
Accumulated other comprehensive loss	74,207	106,857
Retained earnings	5,693,824	4,958,359
Total stockholders' equity	5,554,697	4,851,882
Total liabilities and stockholders' equity	16,337,228	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
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	536,814	477,921
Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 4,278,732	$ 3,909,724