Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012
ASSETS:
Cash and cash equivalents	$ 645,821	$ 357,180
Reinsurance recoverables and trade receivables, net	264,563	297,974
Inventories, net	58,659	58,735
Prepaid expenses	41,444	41,858
Investments, fixed maturities and marketable equities	904,446	766,792
Investments, other	293,585	258,551
Deferred policy acquisition costs, net	79,868	63,914
Other assets	103,498	120,525
Related party assets	173,505	316,157
Subtotal assets	2,565,389	2,281,686
Property, plant and equipment, at cost:
Land	309,654	281,140
Buildings and improvements	1,130,852	1,087,119
Furniture and equipment	310,516	308,120
Property, plant and equipment (gross)	4,053,359	3,787,822
Less: Accumulated depreciation	(1,481,784)	(1,415,457)
Total property, plant and equipment	2,571,575	2,372,365
Total assets	5,136,964	4,654,051
Liabilities:
Accounts payable and accrued expenses	372,756	335,326
Notes, loans and leases payable	1,556,891	1,486,211
Policy benefits and losses, claims and loss expenses payable	1,128,929	1,145,943
Liabilities from investment contracts	395,620	240,961
Other policyholders' funds and liabilities	11,403	7,273
Deferred income	30,886	31,525
Deferred income taxes	404,558	370,992
Total liabilities	3,901,043	3,618,231
Commitments and contingencies (notes 4, 8, 9 and 10)
Stockholders' equity:
Additional paid-in capital	435,376	433,743
Accumulated other comprehensive loss	(35,552)	(45,436)
Retained earnings	1,505,332	1,317,064
Unearned employee stock ownership plan shares	(2,082)	(2,398)
Total stockholders' equity	1,235,921	1,035,820
Total liabilities and stockholders' equity	5,136,964	4,654,051
Series A preferred stock, with no par value, 6,100,000 authorized; 6,100,000 shares issued and none outstanding as of September 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 of September 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 September 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 September 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 September 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 September 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	293,735	255,010
Rental trucks
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 2,008,602	$ 1,856,433