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, 2012	$ 1,751,872,000						$ 220,000,000
Balance, Shares at Jan. 31, 2012							4,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income, net of tax	6,125,000
Purchase of treasury stock	(1,182,000)
Purchase of treasury stock, Shares	78,844
Preferred dividends	(3,850,000)						(3,850,000)
Balance at Apr. 30, 2012
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss), net of $9,785 and $6,499 attributable to redeemable noncontrolling interest	46,056,000		36,425,000			9,631,000
Other comprehensive income, net of tax	17,230,000				17,257,000	(27,000)
Purchase of treasury stock	(1,963,000)			(1,963,000)
Purchase of treasury stock, Shares				129,000
Conversion of Class B to Class A shares	0							233,000	(233,000)
Conversion of Class B to Class A shares, Shares								700,000	(700,000)
Issuance of Class A shares in exchange for Series A preferred stock	(22,370,000)	201,530,000	(19,069,000)				(209,448,000)	4,617,000
Issuance of Class A shares in exchange for Series A preferred stock, shares							(4,189,000)	13,852,000
Restricted stock vested	0	(173,000)						173,000
Restricted stock vested, Shares								519,000
Exercise of stock options	8,368,000	4,531,000		3,729,000				108,000
Exercise of stock options, shares				(230,000)				322,000
Preferred dividends	(13,060,000)		(13,060,000)
Stock-based compensation	14,751,000	14,751,000
Excess income tax deficiency from stock-based compensation	(961,000)	(961,000)
Redeemble noncontrolling interest adjustment	(8,424,000)	(8,424,000)
Acquisition of partners' noncontrolling interest in consolidated subsidiaries	(27,335,000)	(20,197,000)				(7,138,000)
Contributions from noncontrolling interests	1,886,000					1,886,000
Distributions to noncontrolling interests	(27,680,000)					(27,680,000)
Change to equity method of accounting for subsidiaries	(724,000)					(724,000)
Other changes in noncontrolling interests	925,000					925,000
Balance at Jan. 31, 2013	1,738,571,000	932,045,000	576,285,000	(108,000)	(103,203,000)	261,679,000	10,552,000	54,576,000	6,745,000
Balance, Shares at Jan. 31, 2013				7,000			211,000	163,729,000	20,235,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss), net of $9,785 and $6,499 attributable to redeemable noncontrolling interest	(12,575,000)		(19,368,000)			6,793,000
Other comprehensive income, net of tax	399,000				395,000	4,000
Purchase of treasury stock	(3,167,000)			(3,167,000)
Purchase of treasury stock, Shares	179,907			180,000
Conversion of Class B to Class A shares	0							6,000	(6,000)
Conversion of Class B to Class A shares, Shares								19,000	(19,000)
Issuance of Class A shares in exchange for Series A preferred stock	0	5,368,000					(5,489,000)	121,000
Issuance of Class A shares in exchange for Series A preferred stock, shares							(110,000)	363,000
Redemption of Series A preferred stock	(5,063,000)						(5,063,000)
Redemption of Series A preferred stock, Shares							(101,000)
Proceeds from settlement of equity call hedge related to issuance of preferred stock	10,231,000	23,099,000		(12,868,000)
Proceeds from settlement of equity call hedge related to issuance of preferred stock, Shares				765,000
Issuance of Class A shares in exchange for Puttable Equity-Linked Senior Notes due 2014	135,441,000	132,258,000						3,183,000
Issuance of Class A shares in exchange for Puttable Equity-Linked Senior Notes due 2014, Shares								9,550,000
Restricted stock vested	0	(200,000)						200,000
Restricted stock vested, Shares								597,000
Exercise of stock options	1,042,000	993,000		27,000				22,000
Exercise of stock options, shares				(2,000)				66,000
Preferred dividends	(185,000)		(185,000)				(185,000)
Stock-based compensation	5,252,000	5,252,000
Excess income tax deficiency from stock-based compensation	(128,000)	(128,000)
Redeemble noncontrolling interest adjustment	(6,305,000)	(6,305,000)
Acquisition of partners' noncontrolling interest in consolidated subsidiaries	(6,000,000)	(6,000,000)
Contributions from noncontrolling interests	21,000,000					21,000,000
Distributions to noncontrolling interests	(5,128,000)					(5,128,000)
Change to equity method of accounting for subsidiaries	(1,518,000)					(1,518,000)
Adjustment due to change in ownership of consolidated subsidiaries	0	(26,000,000)				26,000,000
Other changes in noncontrolling interests	419,000					419,000
Balance at Apr. 30, 2013	1,872,286,000	1,060,382,000	556,732,000	(16,116,000)	(102,808,000)	309,249,000	0	58,108,000	6,739,000
Balance, Shares at Apr. 30, 2013				950,000			0	174,324,000	20,216,000
Balance at Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A shares in exchange for Puttable Equity-Linked Senior Notes due 2014, Shares								9,549,721
Balance at Apr. 30, 2013								$ 58,108,000
Balance, Shares at Apr. 30, 2013								174,324,000