Segments Information Regarding Operations by Geographic Area (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Segment Reporting Information [Line Items]
Revenue, Net	$ 588.6	$ 528.3
Total Americas [Member]
Segment Reporting Information [Line Items]
Revenue, Net	207.6	181.4
Europe Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Revenue, Net	224.4	215.0
Asia [Member]
Segment Reporting Information [Line Items]
Revenue, Net	156.6	131.9
UNITED STATES | Total Americas [Member]
Segment Reporting Information [Line Items]
Revenue, Net	166.0	143.5
Other Americas [Member] | Total Americas [Member]
Segment Reporting Information [Line Items]
Revenue, Net	41.6	37.9
JAPAN | Asia [Member]
Segment Reporting Information [Line Items]
Revenue, Net	76.3	60.7
Other Asia Pacific [Member] | Asia [Member]
Segment Reporting Information [Line Items]
Revenue, Net	$ 80.3	$ 71.2