Goodwill Changes in the Carrying Amount of Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Apr. 30, 2015
Goodwill [Roll Forward]
Goodwill before accumulated impairment losses beginning balance	$ 1,605.4
Accumulated impairment losses	(149.2)
Goodwill	1,456.2us-gaap_Goodwill
Effect of foreign currency translation, purchase accounting adjustments, and other	(1.1)
Goodwill before accumulated impairment losses ending balance	1,625.3
Accumulated impairment losses	(149.2)
Goodwill	1,476.1us-gaap_Goodwill
Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill before accumulated impairment losses beginning balance	327.5
Accumulated impairment losses
Goodwill	327.5
Effect of foreign currency translation, purchase accounting adjustments, and other	1.9
Goodwill before accumulated impairment losses ending balance	336.6
Accumulated impairment losses
Goodwill	336.6
Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill before accumulated impairment losses beginning balance	427.0
Accumulated impairment losses
Goodwill	427.0
Effect of foreign currency translation, purchase accounting adjustments, and other	(0.4)
Goodwill before accumulated impairment losses ending balance	430.0
Accumulated impairment losses
Goodwill	430.0
Manufacturing
Goodwill [Roll Forward]
Goodwill before accumulated impairment losses beginning balance	422.7
Accumulated impairment losses
Goodwill	422.7
Effect of foreign currency translation, purchase accounting adjustments, and other	(0.3)
Goodwill before accumulated impairment losses ending balance	422.4
Accumulated impairment losses
Goodwill	422.4
Media and Entertainment
Goodwill [Roll Forward]
Goodwill before accumulated impairment losses beginning balance	245.2
Accumulated impairment losses	(149.2)
Goodwill	96.0
Effect of foreign currency translation, purchase accounting adjustments, and other	(0.1)
Goodwill before accumulated impairment losses ending balance	255.5
Accumulated impairment losses	(149.2)
Goodwill	106.3
Delcam
Goodwill [Roll Forward]
Goodwill before accumulated impairment losses beginning balance	183.0
Accumulated impairment losses	0
Goodwill	183.0
Effect of foreign currency translation, purchase accounting adjustments, and other	(2.2)
Goodwill before accumulated impairment losses ending balance	180.8
Accumulated impairment losses	0
Goodwill	180.8
Other
Goodwill [Roll Forward]
Addition arising from other acquisitions	21.0
Goodwill	21.0
Other \| Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Addition arising from other acquisitions	7.2
Other \| Architecture, Engineering and Construction
Goodwill [Roll Forward]
Addition arising from other acquisitions	3.4
Other \| Manufacturing
Goodwill [Roll Forward]
Addition arising from other acquisitions	0
Other \| Media and Entertainment
Goodwill [Roll Forward]
Addition arising from other acquisitions	10.4
Other \| Delcam
Goodwill [Roll Forward]
Addition arising from other acquisitions	$ 0

Goodwill before accumulated impairments

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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