Income Taxes (Schedule Of Significant Components Of The Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Current:
Federal	$ 37,724	$ 71,502	$ 32,988
State	4,030	5,989	1,626
Foreign	30,914	36,804	29,733
Total current	72,668	114,295	64,347
Deferred:
Federal	(8,380)	(3,984)	6,391
State	(799)	543	281
Foreign	(1,823)	5,828	(7,007)
Total deferred	(11,002)	2,387	(335)
Provision for income taxes	$ 61,666	$ 116,682	$ 64,012