Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
ASSETS:
Cash and cash equivalents	$ 1,022,887	$ 697,806
Reinsurance recoverables and trade receivables, net	205,873	178,081
Inventories, net	95,672	82,439
Prepaid expenses	147,375	124,728
Investments, fixed maturities and marketable equities	1,868,314	1,663,768
Investments, other	407,822	367,830
Deferred policy acquisition costs, net	124,820	130,213
Other assets	93,608	97,525
Related party assets	42,909	86,168
Subtotal assets	4,009,280	3,428,558
Property, plant and equipment, at cost:
Land	738,525	648,757
Buildings and improvements	3,000,208	2,618,265
Furniture and equipment	600,216	510,415
Property, plant and equipment, gross	9,120,588	8,361,315
Less: Accumulated depreciation	(2,632,909)	(2,384,033)
Total property, plant and equipment	6,487,679	5,977,282
Total assets	10,496,959	9,405,840
Liabilities:
Accounts payable and accrued expenses	469,955	450,541
Notes, loans and leases payable	3,493,908	3,262,880
Policy benefits and losses, claims and loss expenses payable	1,090,206	1,086,322
Liabilities from investment contracts	1,319,945	1,112,498
Other policyholders' funds and liabilities	10,739	10,150
Deferred income	27,491	28,696
Deferred income taxes, net	671,548	835,009
Total liabilities	7,083,792	6,786,096
Commitments and contingencies (notes 4, 9 and 10)
Stockholders' equity:
Additional paid-in capital	452,619	452,172
Accumulated other comprehensive loss	(9,911)	(51,236)
Retained earnings	3,643,253	2,892,893
Unearned employee stock ownership plan shares	(5,641)	(6,932)
Total stockholders' equity	3,413,167	2,619,744
Total liabilities and stockholders' equity	10,496,959	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	538,334	492,280
Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 4,243,305	$ 4,091,598