Income Taxes (Schedule Of Significant Components Of The Provision For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2013	Jan. 31, 2012		Jan. 31, 2011
Current:
Federal									$ 25,230	$ 65,508		$ 46,662
State									2,622	1,692		911
Foreign									41,333	37,861		28,037
Total current									69,185	105,061		75,610
Deferred:
Federal									11,329	(22,624)		(2,068)
State									1,103	(422)		1,842
Foreign									(35,191)	(10,906)		7,456
Total deferred									(22,759)	(33,952)		7,230
Provision for income taxes	$ (7,372)	$ 14,106	$ 16,550	$ 23,142	$ 15,923	$ 19,500	$ 17,096	$ 18,590	$ 46,426	$ 71,109	[1]	$ 82,840	[1]

[1] See Note 2 - Restatement of Consolidated Financial Statements.