Business Combinations (Changes In Carrying Amount Of Goodwill By Operating Segment) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Goodwill [Line Items]
Balance as of fiscal year 2016	$ 2,077.6
Additions due to acquisitions	37.0
Foreign currency translation adjustments	20.9
Divestiture (1)	(6.9)	[1]
Balance as of the end of the first quarter of fiscal 2017	2,128.6
Buildings and Infrastructure [Member]
Goodwill [Line Items]
Balance as of fiscal year 2016	663.7
Additions due to acquisitions	0.0
Foreign currency translation adjustments	11.2
Divestiture (1)	0.0	[1]
Balance as of the end of the first quarter of fiscal 2017	674.9
Geospatial [Member]
Goodwill [Line Items]
Balance as of fiscal year 2016	405.1
Additions due to acquisitions	0.0
Foreign currency translation adjustments	5.0
Divestiture (1)	(6.9)	[1]
Balance as of the end of the first quarter of fiscal 2017	403.2
Resources and Utilities [Member]
Goodwill [Line Items]
Balance as of fiscal year 2016	217.7
Additions due to acquisitions	13.3
Foreign currency translation adjustments	2.5
Divestiture (1)	0.0	[1]
Balance as of the end of the first quarter of fiscal 2017	233.5
Transportation [Member]
Goodwill [Line Items]
Balance as of fiscal year 2016	791.1
Additions due to acquisitions	23.7
Foreign currency translation adjustments	2.2
Divestiture (1)	0.0	[1]
Balance as of the end of the first quarter of fiscal 2017	$ 817.0

[1] In the first quarter of 2017, the Company sold its ThingMagic business, which was part of the Geospatial segment.