Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
ASSETS:
Cash and cash equivalents	$ 1,805,976	$ 2,060,524
Reinsurance recoverables and trade receivables, net	195,930	189,498
Prepaid Expense	240,525	241,711
Inventories, net	155,161	151,474
Investments, fixed maturities and marketable equities	2,474,624	2,709,037
Equity securities, at estimated fair value	59,675	61,357
Investments, other	660,253	575,540
Deferred policy acquisition costs, net	120,834	128,463
Other assets	52,807	51,052
Right of use Assets - Financing	326,244	474,765
Right of use Assets - Operating	65,361	58,917
Related Parties Amounts Due	48,766	48,308
Subtotal assets	6,206,156	6,750,646
Property, plant and equipment, at cost:
Land	1,649,346	1,537,206
Buildings and improvements	7,943,232	7,088,810
Furniture and equipment	983,683	928,241
Property, plant and equipment (gross)	17,686,592	15,660,293
Less: Accumulated depreciation	(4,890,172)	(4,310,205)
Total property, plant and equipment	12,796,420	11,350,088
Total assets	19,002,576	18,100,734
Liabilities:
Accounts payable and accrued expenses	729,344	761,039
Notes, loans and leases payable	6,437,309	6,108,042
Operating lease liability	64,542	58,373
Policy benefits and losses, claims and loss expenses payable	838,945	880,202
Liabilities from investment contracts	2,363,143	2,398,884
Other policyholders' funds and liabilities	8,012	8,232
Deferred income	45,711	52,282
Deferred Income Tax Liabilities, Net	1,427,769	1,329,489
Total liabilities	11,914,775	11,596,543
Commitments and contingencies (notes 4 and 9)
Stockholders' equity:
Additional paid-in capital	453,643	453,643
Accumulated other comprehensive loss	(308,642)	(285,623)
Retained earnings	7,609,777	7,003,148
Total stockholders' equity	7,087,801	6,504,191
Total liabilities and stockholders' equity	19,002,576	18,100,734
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	927,038	827,696
Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 6,183,293	$ 5,278,340