Segments Information Regarding Operations by Geographic Area (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Segment Reporting Information [Line Items]
Net revenue	$ 592.5	$ 570.4
Americas
Segment Reporting Information [Line Items]
Net revenue	205.7	202.2
Americas | U.S.
Segment Reporting Information [Line Items]
Net revenue	169.5	166.4
Americas | Other Americas
Segment Reporting Information [Line Items]
Net revenue	36.2	35.8
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Net revenue	225.5	216.2
Asia Pacific
Segment Reporting Information [Line Items]
Net revenue	161.3	152.0
Asia Pacific | Japan
Segment Reporting Information [Line Items]
Net revenue	86.6	76.8
Asia Pacific | Other Asia Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 74.7	$ 75.2