Income Taxes (Schedule Of Significant Components Of The Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Current:
Federal	$ 71,502	$ 32,988	$ 42,040
State	5,989	1,626	2,799
Foreign	36,804	29,733	33,022
Total current	114,295	64,347	77,861
Deferred:
Federal	(3,984)	6,391	(785)
State	543	281	(79)
Foreign	5,828	(7,007)	(52,620)
Total deferred	2,387	(335)	(53,484)
Provision for income taxes	$ 116,682	$ 64,012	$ 24,377