Income Taxes (Schedule Of Components Of Pretax Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Income Tax Disclosure [Abstract]
United States	$ 108,700	$ 131,662	$ 133,771
Foreign	120,766	140,649	162,061
Total pretax income	$ 229,466	$ 272,311	$ 295,832