Business Combinations (Changes In Carrying Amount Of Goodwill By Operating Segment) (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Goodwill [Line Items]
Balance as of fiscal year 2016	$ 2,077.6
Additions due to acquisitions	65.4
Purchase price adjustments- prior years' acquisitions	(0.1)
Foreign currency translation adjustments	47.7
Divestiture (1)	(6.9)	[1]
Balance as of the end of the second quarter of fiscal 2017	2,183.7
Buildings and Infrastructure [Member]
Goodwill [Line Items]
Balance as of fiscal year 2016	663.7
Additions due to acquisitions
Purchase price adjustments- prior years' acquisitions	(0.1)
Foreign currency translation adjustments	27.2
Divestiture (1)	0.0	[1]
Balance as of the end of the second quarter of fiscal 2017	690.8
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	10.8
Divestiture (1)	(6.9)	[1]
Balance as of the end of the second quarter of fiscal 2017	409.0
Resources and Utilities [Member]
Goodwill [Line Items]
Balance as of fiscal year 2016	217.7
Additions due to acquisitions	31.9
Purchase price adjustments- prior years' acquisitions	0.0
Foreign currency translation adjustments	5.1
Divestiture (1)	0.0	[1]
Balance as of the end of the second quarter of fiscal 2017	254.7
Transportation [Member]
Goodwill [Line Items]
Balance as of fiscal year 2016	791.1
Additions due to acquisitions	33.5
Purchase price adjustments- prior years' acquisitions	0.0
Foreign currency translation adjustments	4.6
Divestiture (1)	0.0	[1]
Balance as of the end of the second quarter of fiscal 2017	$ 829.2

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