Consolidated Statements of Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interest	Series A Preferred Stock	Common Stock Class A	Common Stock Class B
Balance at Jan. 31, 2011	$ 1,874,260						$ 220,000
Balance, Shares at Jan. 31, 2011							4,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Loss, net of tax	(10,690)
Purchase of treasury stock, Shares	87,070
Preferred dividends	(7,700)						(7,700)
Balance at Jul. 31, 2011
Balance at Jan. 31, 2011	1,874,260	689,004	673,875	(259)	(94,429)	330,912		48,084	7,073
Balance, Shares at Jan. 31, 2011				21,000				144,252,000	21,219,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings, net of $4,567 and $4,308 attributable to redeemable noncontrolling interest	3,999		(86,486)			90,485
Other Comprehensive Loss, net of tax	(24,981)				(26,031)	1,050
Purchase of treasury stock	(1,670)			(1,670)
Purchase of treasury stock, Shares				90,000
Conversion of Class B to Class A shares	0							95	(95)
Conversion of Class B to Class A shares, Shares								(284,000)	(284,000)
Issuance of Class A shares in exchange for Convertible Senior Notes due 2016	48,742	47,594						1,148
Issuance of Class A shares in exchange for Convertible Senior Notes due 2016, Shares								3,444,000
Restricted stock vested	0	(114)						114
Restricted stock vested, Shares								343,000
Exercise of stock options	195	136		55				4
Exercise of stock options, shares				(3,000)				(13,000)
Preferred dividends	(15,400)		(15,400)
Stock-based compensation	12,585	12,585
Excess income tax deficiency from stock-based compensation	(812)	(812)
Redeemable noncontrolling interest adjustment	(6,887)	(6,887)
Acquisition of partners' noncontrolling interest in consolidated subsidiaries	(20,953)	(518)				(20,435)
Contributions from noncontrolling interests	6,087					6,087
Distributions to noncontrolling interests	(89,644)					(89,644)
Change to equity method of accounting for subsidiary	(33,598)					(33,598)
Other changes in noncontrolling interests	(51)					(51)
Balance at Jan. 31, 2012	1,751,872	740,988	571,989	(1,874)	(120,460)	284,806	220,000	49,445	6,978
Balance, Shares at Jan. 31, 2012				108,000			4,400,000	148,336,000	20,935,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings, net of $4,567 and $4,308 attributable to redeemable noncontrolling interest	(9,803)		(20,965)			11,162
Other Comprehensive Loss, net of tax	3,283				3,331	(48)
Purchase of treasury stock	(1,591)			(1,591)
Purchase of treasury stock, Shares	106,711			107,000
Conversion of Class B to Class A shares	0							25	(25)
Conversion of Class B to Class A shares, Shares								(76,000)	(76,000)
Restricted stock vested	0	(149)						149
Restricted stock vested, Shares								444,000
Exercise of stock options	13	(14)		27
Exercise of stock options, shares				(2,000)
Preferred dividends	(7,700)		(7,700)				(7,700)
Stock-based compensation	7,829	7,829
Excess income tax deficiency from stock-based compensation	(779)	(779)
Redeemable noncontrolling interest adjustment	(7,266)	(7,266)
Contributions from noncontrolling interests	240					240
Distributions to noncontrolling interests	(19,188)					(19,188)
Change to equity method of accounting for subsidiary	(724)					(724)
Other changes in noncontrolling interests	(359)	(183)				(176)
Balance at Jul. 31, 2012	1,715,827	740,426	543,324	(3,438)	(117,129)	276,072	220,000	49,619	6,953
Balance, Shares at Jul. 31, 2012				213,000			4,400,000	148,856,000	20,859,000
Balance at Apr. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Loss, net of tax	(2,842)
Preferred dividends	(3,850)						(3,850)
Balance at Jul. 31, 2012	$ 1,715,827						$ 220,000
Balance, Shares at Jul. 31, 2012							4,400,000