Income Taxes (Schedule Of Significant Components Of The Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Current:
Federal	$ 18,366	$ (9,564)	$ 131,107
State	10,171	5,846	6,515
Foreign	62,314	48,905	49,082
Total current	90,851	45,187	186,704
Deferred:
Federal	19,617	(3,272)	(1,129)
State	(451)	64	363
Foreign	21	(9,274)	(3,495)
Total deferred	19,187	(12,482)	(4,261)
Provision for income taxes	$ 110,038	$ 32,705	$ 182,443