Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Jan. 31, 2011
The components of accumulated other comprehensive income (loss) ("accumulated OCI")
Unrealized losses on securities	$ 502	$ 485
Unrealized losses on foreign currency translation	1,435	1,516
Unrealized losses on interest rate contracts	185,626	153,432
Accumulated other comprehensive loss	187,563	155,433
Noncontrolling interest and income tax benefit	(72,840)	(61,004)
Accumulated other comprehensive loss	$ 114,723	$ 94,429