Other Income (Expense), Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Component of Operating Other Cost and Expense [Line Items]
Realized gains on investments, net	$ 24,414	$ 23,810	$ 10,803
Impairment expense	0	(407)	(6,914)
Foreign currency transaction losses, net	(4,403)	(3,432)	(2,776)
Realized and unrealized losses on derivatives, net	(611)	(2,283)	(21)
Realized and unrealized losses on interest rate swap, net	0	(3,102)	(13,591)
Proceeds from litigation settlement	4,750	0	0
Dividend income	94	158	1,635
Other, net	(2,213)	454	1,203
Other (expense) income, net	22,031	6,392	(16,792)
Auction Rate Securities [Member]
Component of Operating Other Cost and Expense [Line Items]
Impairment expense	0	(407)	(6,914)
UBS Put [Member]
Component of Operating Other Cost and Expense [Line Items]
Impairment expense	0	(6,696)	(6,889)
Other Investments [Member]
Component of Operating Other Cost and Expense [Line Items]
Impairment expense	$ 0	$ (2,110)	$ (242)