Information Concerning the Operations of Reportable Segments (Detail) (USD $) In Millions	3 Months Ended
	Apr. 30, 2011		Apr. 30, 2010
Segment Reporting Information [Line Items]
Net revenue	$ 528.3		$ 474.6
Gross profit	473.7		423.3
Platform Solutions and Emerging Business
Segment Reporting Information [Line Items]
Net revenue	210.5		183.8
Gross profit	198.6		173.5
Architecture, Engineering and Construction
Segment Reporting Information [Line Items]
Net revenue	141.4		136.8
Gross profit	128.0		122.8
Manufacturing
Segment Reporting Information [Line Items]
Net revenue	123.2		107.9
Gross profit	113.2		99.8
Media and Entertainment
Segment Reporting Information [Line Items]
Net revenue	53.2		46.1
Gross profit	42.9		35.7
Unallocated
Segment Reporting Information [Line Items]
Gross profit	$ (9.0)	[1]	$ (8.5)	[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.