Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
ASSETS:
Cash and cash equivalents	$ 566,239	$ 350,100
Reinsurance recoverables and trade receivables, net	274,593	297,974
Inventories, net	63,438	58,735
Prepaid expenses	41,586	41,858
Investments, fixed maturities and marketable equities	793,382	766,792
Investments, other	262,456	265,631
Deferred policy acquisition costs, net	64,075	63,914
Other assets	100,910	120,525
Related party assets	169,797	316,157
Subtotal assets	2,336,476	2,281,686
Property, plant and equipment, at cost:
Land	297,527	281,140
Buildings and improvements	1,105,315	1,087,119
Furniture and equipment	306,441	308,120
Property, plant and equipment (gross)	3,951,462	3,787,822
Less: Accumulated depreciation	(1,449,102)	(1,415,457)
Total property, plant and equipment	2,502,360	2,372,365
Total assets	4,838,836	4,654,051
Liabilities:
Accounts payable and accrued expenses	382,012	335,326
Notes, loans and leases payable	1,540,538	1,486,211
Policy benefits and losses, claims and loss expenses payable	1,121,200	1,145,943
Liabilities from investment contracts	261,987	240,961
Other policyholders' funds and liabilities	5,389	7,273
Deferred income	37,960	31,525
Deferred income taxes	375,090	370,992
Total liabilities	3,724,176	3,618,231
Commitments and contingencies (notes 4, 8, 9 and 10)
Stockholders' equity:
Additional paid-in capital	434,527	433,743
Accumulated other comprehensive loss	(46,391)	(45,436)
Retained earnings	1,395,913	1,317,064
Unearned employee stock ownership plan shares	(2,236)	(2,398)
Total stockholders' equity	1,114,660	1,035,820
Total liabilities and stockholders' equity	4,838,836	4,654,051
Series A preferred stock, with no par value, 6,100,000 authorized; 6,100,000 shares issued and none outstanding as ofJune 30 and March 31, 2012
Stockholders' equity:
Preferred stock, value, issued
Series B preferred stock, with no par value, 100,000 shares authorized; none issued and outstanding as ofJune 30 and March 31, 2012
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, 2012
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, 2012
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, 2012)
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, 2012)
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	270,621	255,010
Rental trucks
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 1,971,558	$ 1,856,433