Business Combinations (Changes In Carrying Amount Of Goodwill By Operating Segment) (Detail) $ in Millions	9 Months Ended
	Sep. 29, 2017 USD ($)
Goodwill [Line Items]
Balance as of fiscal year 2016	$ 2,077.6
Additions due to acquisitions	143.4
Purchase price adjustments- prior years' acquisitions	(0.1)
Foreign currency translation adjustments	75.3
Divestiture (1)	(6.9)	[1]
Balance as of the end of the third quarter of fiscal 2017	2,289.3
Buildings and Infrastructure [Member]
Goodwill [Line Items]
Balance as of fiscal year 2016	663.7
Additions due to acquisitions	2.5
Purchase price adjustments- prior years' acquisitions	(0.1)
Foreign currency translation adjustments	39.8
Divestiture (1)	0.0	[1]
Balance as of the end of the third quarter of fiscal 2017	705.9
Geospatial [Member]
Goodwill [Line Items]
Balance as of fiscal year 2016	405.1
Additions due to acquisitions	0.0
Purchase price adjustments- prior years' acquisitions	0.0
Foreign currency translation adjustments	17.5
Divestiture (1)	(6.9)	[1]
Balance as of the end of the third quarter of fiscal 2017	415.7
Resources and Utilities [Member]
Goodwill [Line Items]
Balance as of fiscal year 2016	217.7
Additions due to acquisitions	89.1
Purchase price adjustments- prior years' acquisitions	0.0
Foreign currency translation adjustments	10.2
Divestiture (1)	0.0	[1]
Balance as of the end of the third quarter of fiscal 2017	317.0
Transportation [Member]
Goodwill [Line Items]
Balance as of fiscal year 2016	791.1
Additions due to acquisitions	51.8
Purchase price adjustments- prior years' acquisitions	0.0
Foreign currency translation adjustments	7.8
Divestiture (1)	0.0	[1]
Balance as of the end of the third quarter of fiscal 2017	$ 850.7

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