Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Mar. 31, 2011
ASSETS:
Cash and cash equivalents	$ 438,277	$ 375,496
Reinsurance recoverables and trade receivables, net	351,828	205,371
Inventories, net	56,766	59,942
Prepaid expenses	54,941	57,624
Investments, fixed maturities and marketable equities	724,456	659,809
Investments, other	242,539	201,868
Deferred policy acquisition costs, net	62,384	52,870
Other assets	124,264	166,633
Related party assets	297,513	301,968
Subtotal assets	2,352,968	2,081,581
Property, plant and equipment, at cost:
Land	281,144	239,177
Buildings and improvements	1,058,932	1,024,669
Furniture and equipment	309,050	310,671
Property, plant and equipment (gross)	3,669,764	3,435,980
Less: Accumulated depreciation	(1,388,730)	(1,341,407)
Total property, plant and equipment	2,281,034	2,094,573
Total assets	4,634,002	4,176,154
Liabilities:
Accounts payable and accrued expenses	344,205	304,006
Notes, loans and leases payable	1,507,976	1,397,842
Policy benefits and losses, claims and loss expenses payable	1,148,074	927,376
Liabilities from investment contracts	236,805	246,717
Other policyholders' funds and liabilities	5,382	8,727
Deferred income	28,218	27,209
Deferred income taxes	362,164	271,257
Total liabilities	3,632,824	3,183,134
Commitments and contingencies (notes 4, 9, 10 and 11)
Stockholders' equity:
Additional paid-in capital	432,846	425,212
Accumulated other comprehensive loss	(53,619)	(46,467)
Retained earnings	1,291,659	1,140,002
Unearned employee stock ownership plan shares	(2,555)	(3,382)
Total stockholders' equity	1,001,178	993,020
Total liabilities and stockholders' equity	4,634,002	4,176,154
Series A preferred stock, with no par value, 6,100,000 authorized; 6,100,000 and 5,791,700 shares issued and none and 5,791,700 outstanding as of December 31 and March 31, 2011
Stockholders' equity:
Preferred stock, value, issued
Series B preferred stock, with no par value, 100,000 shares authorized; none issued and outstanding as of December 31 and March 31, 2011
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 December 31 and March 31, 2011
Stockholders' equity:
Common stock, value, issued
Common stock of $0.25 par value, 150,000,000 shares authorized; 41,985,700 issued as of December 31 and March 31, 2011
Stockholders' equity:
Common stock, value, issued	10,497	10,497
Cost of common shares in treasury, net (22,377,912 shares as of December 31 and March 31, 2011)
Stockholders' equity:
Treasury stock, value	(525,653)	(525,653)
Cost of preferred shares in treasury, net (6,100,000 as of December 31, 2011 and 308,300 as of March 31, 2011)
Stockholders' equity:
Treasury stock, value	(151,997)	(7,189)
Rental trailers and other rental equipment
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	253,791	249,700
Rental trucks
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 1,766,847	$ 1,611,763