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Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Schedule of fair value of nonrecourse mortgage debt and notes payable, bank revolving credit facility and senior and subordinated debt
Carrying Value	$ 6,698,052	$ 8,118,053
Fair Value	7,061,498	8,322,294
Fixed Interest Rate [Member]
Schedule of fair value of nonrecourse mortgage debt and notes payable, bank revolving credit facility and senior and subordinated debt
Carrying Value	4,458,214	4,649,129
Fair Value	4,719,636	4,802,728
Variable Interest Rate [Member]
Schedule of fair value of nonrecourse mortgage debt and notes payable, bank revolving credit facility and senior and subordinated debt
Carrying Value	2,239,838	3,468,924
Fair Value	$ 2,341,862	$ 3,519,566

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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