Consolidated Statements of Equity (Unaudited) (USD $)	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	$ 1,874,260,000						$ 220,000,000
Balance, Shares at Jan. 31, 2011							4,400,000
Other Comprehensive Loss, net of tax	(338,000)
Purchase of treasury stock	(1,339,000)
Purchase of treasury stock, Shares	70,906
Preferred dividends	(3,850,000)						(3,850,000)
Balance at Apr. 30, 2011
Balance at Jan. 31, 2011	1,874,260,000	689,004,000	673,875,000	(259,000)	(94,429,000)	330,912,000		48,084,000	7,073,000
Balance, Shares at Jan. 31, 2011				21,000				144,252,000	21,219,000
Net earnings, net of $4,567 and $1,691 attributable to redeemable noncontrolling interest	3,999,000		(86,486,000)			90,485,000
Other Comprehensive Loss, net of tax	(24,981,000)				(26,031,000)	1,050,000
Purchase of treasury stock	(1,670,000)			(1,670,000)
Purchase of treasury stock, Shares				90,000
Conversion of Class B to Class A shares								95,000	(95,000)
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	48,742,000	47,594,000						1,148,000
Issuance of Class A shares in exchange for Convertible Senior Notes due 2016, Shares								3,444,000
Restricted stock vested		(114,000)						114,000
Restricted stock vested, Shares								343,000
Exercise of stock options	195,000	136,000		55,000				4,000
Exercise of stock options, shares				(3,000)				13,000
Preferred dividends	(15,400,000)		(15,400,000)
Stock-based compensation	12,585,000	12,585,000
Excess income tax deficiency from stock-based compensation	(812,000)	(812,000)
Redeemable noncontrolling interest adjustment	(6,887,000)	(6,887,000)
Acquisition of partners' noncontrolling interest in consolidated subsidiaries	(20,953,000)	(518,000)				(20,435,000)
Contributions from noncontrolling interests	6,087,000					6,087,000
Distributions to noncontrolling interests	(89,644,000)					(89,644,000)
Change to equity method of accounting for subsidiaries	(33,598,000)					(33,598,000)
Other changes in noncontrolling interests	(51,000)					(51,000)
Balance at Jan. 31, 2012	1,751,872,000	740,988,000	571,989,000	(1,874,000)	(120,460,000)	284,806,000	220,000,000	49,445,000	6,978,000
Balance, Shares at Jan. 31, 2012				108,000			4,400,000	148,336,000	20,935,000
Net earnings, net of $4,567 and $1,691 attributable to redeemable noncontrolling interest	25,464,000		22,752,000			2,712,000
Other Comprehensive Loss, net of tax	6,125,000				6,121,000	4,000
Purchase of treasury stock	(1,182,000)			(1,182,000)
Purchase of treasury stock, Shares	78,844			79,000
Conversion of Class B to Class A shares								8,000	(8,000)
Conversion of Class B to Class A shares, Shares								23,000	(23,000)
Restricted stock vested		(110,000)						110,000
Restricted stock vested, Shares								329,000
Exercise of stock options	6,000	(7,000)		13,000
Exercise of stock options, shares				(1,000)
Preferred dividends	(3,850,000)		(3,850,000)				(3,850,000)
Stock-based compensation	4,531,000	4,531,000
Excess income tax deficiency from stock-based compensation	(139,000)	(139,000)
Redeemable noncontrolling interest adjustment	(2,980,000)	(2,980,000)
Contributions from noncontrolling interests	64,000					64,000
Distributions to noncontrolling interests	(2,694,000)					(2,694,000)
Change to equity method of accounting for subsidiaries	(724,000)					(724,000)
Other changes in noncontrolling interests	(381,000)					(381,000)
Balance at Apr. 30, 2012	$ 1,776,112,000	$ 742,283,000	$ 590,891,000	$ (3,043,000)	$ (114,339,000)	$ 283,787,000	$ 220,000,000	$ 49,563,000	$ 6,970,000
Balance, Shares at Apr. 30, 2012				186,000			4,400,000	148,688,000	20,912,000