Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013		Jan. 31, 2013
The components of accumulated other comprehensive income (loss) ("accumulated OCI")
Unrealized losses on securities	$ 124		$ 340
Unrealized (gains) losses on foreign currency translation	189		(69)
Unrealized losses on interest rate contracts	167,806	[1]	168,497	[1]
Total unrealized losses	168,119		168,768
Income tax benefit	(65,132)		(65,382)
Noncontrolling Interest	(179)		(183)
Accumulated other comprehensive loss	$ 102,808		$ 103,203

[1] Included in the amounts as of April 30 and January 31, 2013 are $126,171 and $126,506, respectively, of unrealized losses on an interest rate swap associated with New York Times, an office building in Manhattan, New York, on its nonrecourse mortgage debt with a notional amount of $640,000. This swap effectively fixes the mortgage at an all-in lender interest rate of 6.40% (5.50% swap rate plus 0.90% lender spread) and expires in September 2017.