Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2024	Mar. 31, 2024
ASSETS:
Cash and cash equivalents	$ 1,017,398	$ 1,534,544
Reinsurance recoverables and trade receivables, net	181,303	215,908
Inventories, net	155,140	150,940
Prepaid Expense	265,891	246,082
Fixed maturities - available for sale	2,617,126	2,442,504
Equity securities, at estimated fair value	67,667	66,274
Investments, other	625,630	633,936
Deferred policy acquisition costs, net	123,015	121,224
Other assets	126,413	111,743
Right of use Assets - Financing	168,817	289,305
Right of use Assets - Operating	48,500	53,712
Related Parties Amounts Due	58,048	57,934
Subtotal assets	5,454,948	5,924,106
Property, plant and equipment, at cost:
Land	1,822,497	1,670,033
Buildings and improvements	9,305,846	8,237,354
Furniture and equipment	1,036,203	1,003,770
Property, plant and equipment (gross)	20,543,731	18,185,784
Less: Accumulated depreciation	(5,668,514)	(5,051,132)
Total property, plant and equipment	14,875,217	13,134,652
Total assets	20,330,165	19,058,758
Liabilities:
Accounts payable and accrued expenses	799,452	783,084
Notes, loans and leases payable	6,896,987	6,271,362
Operating lease liability	49,543	55,032
Policy benefits and losses, claims and loss expenses payable	829,992	849,113
Liabilities from investment contracts	2,546,940	2,411,352
Other policyholders' funds and liabilities	20,895	18,070
Deferred income	47,419	51,175
Deferred Income Tax Liabilities, Net	1,507,604	1,447,125
Total liabilities	12,698,832	11,886,313
Commitments and contingencies (notes 4 and 9)
Stockholders' equity:
Additional paid-in capital	462,548	462,548
Accumulated other comprehensive loss	(187,238)	(223,216)
Retained earnings	8,023,000	7,600,090
Total stockholders' equity	7,631,333	7,172,445
Total liabilities and stockholders' equity	20,330,165	19,058,758
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
Nonvoting Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	176	176
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	1,032,132	936,303
Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 7,347,053	$ 6,338,324