Segments - Concerning the Operations Of Reportable Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2014		Jan. 31, 2013		Jan. 31, 2012
Segment Reporting Information [Line Items]
Net revenue	$ 586.6	$ 555.2	$ 561.7	$ 570.4	$ 606.9	$ 548.0	$ 568.7	$ 588.6	$ 2,273.9		$ 2,312.2		$ 2,215.6
Gross profit	514.7	488.1	493.9	502.9	544.9	490.1	508.9	529.8	1,999.6		2,073.7		1,986.5
Depreciation and Amortization									128.9		127.8		115.5
Platform Solutions and Emerging Business
Segment Reporting Information [Line Items]
Net revenue									789.2	[1]	843.0	[1]	833.1	[1]
Gross profit									716.8	[1]	788.8	[1]	788.0	[1]
Depreciation and Amortization									5.5		1.8		1.8
Architecture, Engineering and Construction
Segment Reporting Information [Line Items]
Net revenue									730.6	[1]	701.1	[1]	626.4	[1]
Gross profit									663.8	[1]	642.0	[1]	569.7	[1]
Depreciation and Amortization									0.2		0.2		0.7
Manufacturing
Segment Reporting Information [Line Items]
Net revenue									579.4		573.8		540.3
Gross profit									531.5		531.3		496.1
Depreciation and Amortization									0.9		0.5		1.7
Media and Entertainment
Segment Reporting Information [Line Items]
Net revenue									174.7	[1]	194.3	[1]	215.8	[1]
Gross profit									137.8		156.5		174.6
Depreciation and Amortization									0.2		0.4		0.5
Unallocated
Segment Reporting Information [Line Items]
Gross profit									(50.3)	[2]	(44.9)	[2]	(41.9)	[2]
Depreciation and Amortization									$ 122.1		$ 124.9		$ 110.8

[1] Prior period 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.