Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013
ASSETS:
Cash and cash equivalents	$ 552,587	$ 463,744
Reinsurance recoverables and trade receivables, net	284,518	261,789
Inventories, net	58,304	56,396
Prepaid expenses	43,378	57,451
Investments, fixed maturities and marketable equities	1,117,008	1,095,338
Investments, other	231,418	241,765
Deferred policy acquisition costs, net	97,823	93,043
Other assets	104,744	99,986
Related party assets	151,127	182,035
Subtotal assets	2,640,907	2,551,547
Property, plant and equipment, at cost:
Land	348,234	333,228
Buildings and improvements	1,278,622	1,197,875
Furniture and equipment	313,796	311,142
Property, plant and equipment (gross)	4,535,777	4,314,409
Less: Accumulated depreciation	(1,597,922)	(1,559,355)
Total property, plant and equipment	2,937,855	2,755,054
Total assets	5,578,762	5,306,601
Liabilities:
Accounts payable and accrued expenses	366,302	358,491
Notes, loans and leases payable	1,737,277	1,661,845
Policy benefits and losses, claims and loss expenses payable	1,115,821	1,115,048
Liabilities from investment contracts	538,777	510,789
Other policyholders' funds and liabilities	7,114	7,294
Deferred income	37,752	30,217
Deferred income taxes	429,428	393,658
Total liabilities	4,232,471	4,077,342
Commitments and contingencies (notes 4, 8, 9 and 10)
Stockholders' equity:
Additional paid-in capital	439,524	438,168
Accumulated other comprehensive loss	(20,099)	(22,680)
Retained earnings	1,595,598	1,482,630
Unearned employee stock ownership plan shares	(1,579)	(1,706)
Total stockholders' equity	1,346,291	1,229,259
Total liabilities and stockholders' equity	5,578,762	5,306,601
Series A preferred stock, with no par value, 6,100,000 authorized; 6,100,000 shares issued and none outstanding as of June 30 and March 31, 2013
Stockholders' equity:
Preferred stock, value, issued
Series B preferred stock, with no par value, 100,000 shares authorized; none issued and outstanding as of June 30 and March 31, 2013
Stockholders' equity:
Preferred stock, value, issued
Series A common stock of $0.25 par value, 10,000,000 shares authorized; none issued and outstanding as of June 30 and March 31, 2013
Stockholders' equity:
Common stock, value, issued
Common stock of $0.25 par value, 150,000,000 shares authorized; 41,985,700 issued and 19,607,788 outstanding as of June 30 and March 31, 2013
Stockholders' equity:
Common stock, value, issued	10,497	10,497
Cost of common shares in treasury, net (22,377,912 shares as of June 30 and March 31, 2013)
Stockholders' equity:
Treasury stock, value	(525,653)	(525,653)
Cost of preferred shares in treasury, net (6,100,000 shares as of June 30 and March 31, 2013)
Stockholders' equity:
Treasury stock, value	(151,997)	(151,997)
Rental trailers and other rental equipment
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	331,433	317,476
Rental trucks
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 2,263,692	$ 2,154,688