Goodwill Changes in the Carrying Amount of Goodwill (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended							6 Months Ended						6 Months Ended						6 Months Ended
	Jul. 31, 2014	Jul. 31, 2014 Platform Solutions and Emerging Business	Jul. 31, 2014 Architecture, Engineering and Construction	Jul. 31, 2014 Manufacturing	Jul. 31, 2014 Media and Entertainment	Jul. 31, 2014 Delcam	Feb. 06, 2014 Delcam	Jul. 31, 2014 Delcam Platform Solutions and Emerging Business	Jul. 31, 2014 Delcam Architecture, Engineering and Construction	Jul. 31, 2014 Delcam Manufacturing	Jul. 31, 2014 Delcam Media and Entertainment	Jul. 31, 2014 Within	May 29, 2014 Within	Jul. 31, 2014 Within Platform Solutions and Emerging Business	Jul. 31, 2014 Within Architecture, Engineering and Construction	Jul. 31, 2014 Within Manufacturing	Jul. 31, 2014 Within Media and Entertainment	Jul. 31, 2014 Shotgun	Jun. 27, 2014 Shotgun	Jul. 31, 2014 Shotgun Platform Solutions and Emerging Business	Jul. 31, 2014 Shotgun Architecture, Engineering and Construction	Jul. 31, 2014 Shotgun Manufacturing	Jul. 31, 2014 Shotgun Media and Entertainment	Jul. 31, 2014 Other acquisitions	Jul. 31, 2014 Other acquisitions Platform Solutions and Emerging Business	Jul. 31, 2014 Other acquisitions Architecture, Engineering and Construction	Jul. 31, 2014 Other acquisitions Manufacturing	Jul. 31, 2014 Other acquisitions Media and Entertainment
Goodwill [Roll Forward]
Goodwill before accumulated impairment losses beginning balance	$ 1,159.1	$ 142.3	$ 415.2	$ 411.6	$ 190.0
Accumulated impairment losses beginning balance	(149.2)	0	0	0	(149.2)
Goodwill	1,009.9	142.3	415.2	411.6	40.8		192.8						80.6						43.2
Goodwill, acquired during period						192.8		0	0	192.8	0	80.6		80.6	0	0	0	43.2		0	0	0	43.2	117.5	68.8	15.5	17.9	15.3
Effect of foreign currency translation, purchase accounting and other	3.6	1.5	(1.2)	4.2	(0.9)
Goodwill before accumulated impairment losses ending balance	1,596.8	293.2	429.5	626.5	247.6
Accumulated impairment losses ending balance	(149.2)	0	0	0	(149.2)
Goodwill	$ 1,447.6	$ 293.2	$ 429.5	$ 626.5	$ 98.4		$ 192.8						$ 80.6						$ 43.2					$ 117.5