Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Real Estate
Completed rental properties	$ 7,183,448	$ 8,215,425
Projects under construction and development	2,328,979	2,706,235
Land held for development and sale	77,298	244,879
Total Real Estate	9,589,725	11,166,539
Less accumulated depreciation	(1,526,503)	(1,614,399)
Real Estate, net - (variable interest entities $2,103.8 and $2,627.8 million, respectively)	8,063,222	9,552,140
Cash and equivalents - (variable interest entities $17.8 million and $24.7 million, respectively)	217,486	193,372
Restricted cash and escrowed funds - (variable interest entities $348.1 million and $471.4 million, respectively)	542,566	720,180
Notes and accounts receivable, net	406,244	403,101
Investments in and advances to unconsolidated entities	609,079	431,509
Other assets - (variable interest entities $130.8 million and $166.8 million, respectively)	608,541	759,399
Land held for divestiture	57,145	0
Total Assets	10,504,283	12,059,701
Liabilities
Mortgage debt and notes payable, nonrecourse - (variable interest entities $1,122.0 million and $1,879.0 million, respectively)	5,640,439	7,207,218
Bank revolving credit facility	0	137,152
Senior and subordinated debt - (variable interest entities $29.0 million, as of each period)	1,038,529	773,683
Accounts payable, accrued expenses and other liabilities - (variable interest entities $171.0 million and $150.2 million, respectively)	1,112,462	1,051,256
Cash distributions and losses in excess of investments in unconsolidated entities	279,708	290,492
Deferred income taxes	433,040	498,811
Mortgage debt and notes payable, nonrecourse on land held for divestiture	19,084	0
Total Liabilities	8,523,262	9,958,612
Redeemable Noncontrolling Interest	229,149	226,829
Commitments and Contingencies
Common stock - $.33 1/3 par value
Common stock, value	56,423	55,157
Additional paid-in capital	740,988	689,004
Retained earnings	571,989	673,875
Less treasury stock, at cost; 108,329 and 21,324 Class A shares, respectively	(1,874)	(259)
Shareholders' equity before accumulated other comprehensive loss	1,587,526	1,637,777
Accumulated other comprehensive loss	(120,460)	(94,429)
Total Shareholders' Equity	1,467,066	1,543,348
Noncontrolling interests	284,806	330,912
Total Equity	1,751,872	1,874,260
Total Liabilities and Equity	10,504,283	12,059,701
Common Stock Class A
Common stock - $.33 1/3 par value
Common stock, value	49,445	48,084
Total Equity	49,445	48,084
Common Stock Class B
Common stock - $.33 1/3 par value
Common stock, value	6,978	7,073
Total Equity	6,978	7,073
Series A Preferred Stock
Shareholders' Equity
Preferred stock	220,000	220,000
Common stock - $.33 1/3 par value
Total Equity	220,000	220,000
Other Preferred Stock
Shareholders' Equity
Preferred stock