Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021
ASSETS:
Cash and cash equivalents	$ 1,519,981	$ 1,194,012
Reinsurance recoverables and trade receivables, net	233,056	224,426
Inventories, net	117,978	105,577
Prepaid expenses	306,565	469,144
Investments, fixed maturities and marketable equities	2,755,133	2,695,656
Investments, other	525,893	489,759
Deferred policy acquisition costs, net	101,169	89,749
Other assets	46,910	47,730
Right of use Assets - Financing	814,875	877,038
Right of use Assets - Operating	89,369	92,505
Related party assets	34,481	35,395
Subtotal assets	6,545,410	6,320,991
Property, plant and equipment, at cost:
Land	1,110,300	1,075,813
Buildings and improvements	5,284,224	5,163,705
Furniture and equipment	796,077	786,505
Property, plant and equipment (gross)	11,805,268	11,413,668
Less: Accumulated depreciation	(3,235,796)	(3,083,053)
Total property, plant and equipment	8,569,472	8,330,615
Total assets	15,114,882	14,651,606
Liabilities:
Accounts payable and accrued expenses	696,797	645,575
Notes, loans and leases payable	4,673,383	4,668,907
Financing lease liability	468,484
Operating lease liability	89,390	92,510
Policy benefits and losses, claims and loss expenses payable	1,007,144	997,701
Liabilities from investment contracts	2,226,560	2,161,530
Other policyholders' funds and liabilities	10,989	12,420
Deferred income	54,738	42,592
Deferred income taxes, net	1,244,353	1,178,489
Total liabilities	10,003,354	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	31,132	106,857
Retained earnings	5,293,730	4,958,359
Total stockholders' equity	5,111,528	4,851,882
Total liabilities and stockholders' equity	15,114,882	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	495,012	477,921
Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 4,119,655	$ 3,909,724