Segments Concerning the Operations Of Reportable Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012		Oct. 31, 2011
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Parent	$ 29.4	$ 72.8	$ 172.9		$ 213.3
Revenue, Net	548.0	548.6	1,705.3		1,623.2
Gross Profit	490.1	489.0	1,528.8		1,451.6
Platform Solutions and Emerging Business [Member]
Segment Reporting Information [Line Items]
Revenue, Net	204.7	209.7	650.0		618.7
Gross Profit	191.2	198.2	610.0		584.0
Architecture, Engineering and Construction [Member]
Segment Reporting Information [Line Items]
Revenue, Net	163.1	152.2	488.8		451.5
Gross Profit	149.6	137.5	446.2		408.8
Manufacturing [Member]
Segment Reporting Information [Line Items]
Revenue, Net	131.8	133.5	418.8		392.5
Gross Profit	122.3	122.2	386.7		359.8
Media and Entertainment [Member]
Segment Reporting Information [Line Items]
Revenue, Net	48.4	53.2	147.7		160.5
Gross Profit	38.2	43.2	119.0		129.6
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	$ (11.2)	$ (12.1)	$ (33.1)	[1]	$ (30.6)	[1]

[1] Unallocated amounts primarily relate to corporate expenses and other costs and expenses that are managed outside the reportable segments, including stock-based compensation expense.