Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
ASSETS:
Cash and cash equivalents	$ 768,351	$ 697,806
Reinsurance recoverables and trade receivables, net	194,131	178,081
Inventories, net	100,693	82,439
Prepaid expenses	83,673	124,728
Investments, fixed maturities and marketable equities	1,843,768	1,663,768
Investments, other	395,327	367,830
Deferred policy acquisition costs, net	125,936	130,213
Other assets	101,767	97,525
Related party assets	80,923	86,168
Subtotal assets	3,694,569	3,428,558
Property, plant and equipment, at cost:
Land	684,729	648,757
Buildings and improvements	2,826,712	2,618,265
Furniture and equipment	564,033	510,415
Property, plant and equipment, gross	8,939,385	8,361,315
Less: Accumulated depreciation	(2,551,064)	(2,384,033)
Total property, plant and equipment	6,388,321	5,977,282
Total assets	10,082,890	9,405,840
Liabilities:
Accounts payable and accrued expenses	441,010	450,541
Notes, loans and leases payable	3,422,077	3,262,880
Policy benefits and losses, claims and loss expenses payable	1,099,597	1,086,322
Liabilities from investment contracts	1,263,107	1,112,498
Other policyholders' funds and liabilities	20,454	10,150
Deferred income	32,443	28,696
Deferred income taxes, net	911,780	835,009
Total liabilities	7,190,468	6,786,096
Commitments and contingencies (notes 4, 8 and 9)
Stockholders' equity:
Additional paid-in capital	452,474	452,172
Accumulated other comprehensive loss	(11,534)	(51,236)
Retained earnings	3,124,152	2,892,893
Unearned employee stock ownership plan shares	(5,517)	(6,932)
Total stockholders' equity	2,892,422	2,619,744
Total liabilities and stockholders' equity	10,082,890	9,405,840
Series A Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued
Series B Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued
Series A Common Stock [Member]
Stockholders' equity:
Common stock, value, issued
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	526,603	492,280
Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 4,337,308	$ 4,091,598