Restructuring (Roll Forward Of Workforce Reduction And Restructuring Activities Under Various Plans) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 31, 2012		Jul. 31, 2011
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 3,672		$ 5,814
Charges	1,416		13,202
Change in assumptions	(309)		(152)
Translation adjustments	(94)		514
Paid or utilized	(3,463)		(11,779)
Restructuring reserve, ending balance	1,222		7,599
Third Quarter 2010 Initiative | Severance Related
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	2,486	[1]	2,462	[1]
Charges	531	[1]	6,128	[1]
Change in assumptions	(136)	[1]	(140)	[1]
Translation adjustments	(2)	[1]	0	[1]
Paid or utilized	(2,850)	[1]	(7,134)	[1]
Restructuring reserve, ending balance	29	[1]	1,316	[1]
Third Quarter 2010 Initiative | Facilities Related
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	8	[1]	86	[1]
Charges	0	[1]	17	[1]
Change in assumptions	(8)	[1]	0	[1]
Translation adjustments	0	[1]	0	[1]
Paid or utilized	0	[1]	(68)	[1]
Restructuring reserve, ending balance	0	[1]	35	[1]
Netcentrex 2010 Initiative | Severance Related
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	1,178		2,910
Charges	13		6,692
Change in assumptions	(165)		(12)
Translation adjustments	(42)		514
Paid or utilized	(395)		(3,871)
Restructuring reserve, ending balance	589		6,233
Netcentrex 2010 Initiative | Facilities Related
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0		0
Charges	872		0
Change in assumptions	0		0
Translation adjustments	(50)		0
Paid or utilized	(218)		0
Restructuring reserve, ending balance	604		0
First Quarter 2010 Initiative | Severance Related
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			6
Charges			0
Change in assumptions			(3)
Translation adjustments			0
Paid or utilized			(3)
Restructuring reserve, ending balance			0
First Quarter 2010 Initiative | Facilities Related
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			94
Charges			13
Change in assumptions			0
Translation adjustments			0
Paid or utilized			(107)
Restructuring reserve, ending balance			0
Pre 2010 Initiatives | Severance Related
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			227
Charges			272
Change in assumptions			1
Translation adjustments			0
Paid or utilized			(500)
Restructuring reserve, ending balance			0
Pre 2010 Initiatives | Facilities Related
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			29
Charges			80
Change in assumptions			2
Translation adjustments			0
Paid or utilized			(96)
Restructuring reserve, ending balance			$ 15

[1] Includes charges attributable to the Phase II Business Transformation.