Segments Concerning the Operations Of Reportable Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 30, 2013		Apr. 30, 2012
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Parent	$ 55.6		$ 78.9
Revenue, Net	570.4		588.6
Gross Profit	502.9		529.8
Platform Solutions and Emerging Business [Member]
Segment Reporting Information [Line Items]
Revenue, Net	212.7	[1]	226.8	[1]
Gross Profit	195.2	[1]	213.6	[1]
Architecture, Engineering and Construction [Member]
Segment Reporting Information [Line Items]
Revenue, Net	172.1	[1]	165.7	[1]
Gross Profit	155.5	[1]	151.2	[1]
Manufacturing [Member]
Segment Reporting Information [Line Items]
Revenue, Net	139.1		145.6
Gross Profit	127.5		134.3
Media and Entertainment [Member]
Segment Reporting Information [Line Items]
Revenue, Net	46.5		50.5
Gross Profit	37.0		41.8
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	$ (12.3)	[2]	$ (11.1)	[2]

[1] The fiscal 2013 quarterly segment revenue amounts have been updated to conform with the current period's presentation.

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