Goodwill And Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Goodwill
Balance as of January 31, 2019		$ 892,990
Acquisitions		82,889
Goodwill Impairment	$ (47,400)	0	$ (47,434)	$ 0
Foreign currency translation and other		(2,622)
Balance as of January 31, 2020	892,990	973,257	892,990
Americas
Goodwill
Balance as of January 31, 2019		488,508
Acquisitions		82,889
Foreign currency translation and other		3,137
Balance as of January 31, 2020	488,508	574,534	488,508
Europe
Goodwill
Balance as of January 31, 2019		381,271
Acquisitions		0
Foreign currency translation and other		(5,630)
Balance as of January 31, 2020	381,271	375,641	381,271
Asia Pacific
Goodwill
Balance as of January 31, 2019		23,211
Acquisitions		0
Goodwill Impairment			(47,400)
Foreign currency translation and other		(129)
Balance as of January 31, 2020	$ 23,211	$ 23,082	$ 23,211