Business Combinations (Changes In Carrying Amount Of Goodwill By Operating Segment) (Detail) $ in Millions	6 Months Ended
	Jun. 29, 2018 USD ($)
Goodwill [Line Items]
Balance as of fiscal year 2017	$ 2,287.1	[1]
Additions due to acquisitions	421.7
Purchase price adjustments- prior years' acquisitions	(0.6)
Foreign currency translation adjustments	(24.3)
Divestiture (1)	(1.8)	[2]
Balance as of the end of the second quarter of fiscal 2018	2,682.1
Buildings and Infrastructure [Member]
Goodwill [Line Items]
Balance as of fiscal year 2017	706.8
Additions due to acquisitions	421.7
Purchase price adjustments- prior years' acquisitions	0.0
Foreign currency translation adjustments	(8.8)
Divestiture (1)	0.0	[2]
Balance as of the end of the second quarter of fiscal 2018	1,119.7
Geospatial [Member]
Goodwill [Line Items]
Balance as of fiscal year 2017	415.3
Purchase price adjustments- prior years' acquisitions	0.0
Foreign currency translation adjustments	(7.4)
Divestiture (1)	(1.8)	[2]
Balance as of the end of the second quarter of fiscal 2018	406.1
Resources and Utilities [Member]
Goodwill [Line Items]
Balance as of fiscal year 2017	314.5
Purchase price adjustments- prior years' acquisitions	(0.4)
Foreign currency translation adjustments	(5.0)
Divestiture (1)	0.0	[2]
Balance as of the end of the second quarter of fiscal 2018	309.1
Transportation [Member]
Goodwill [Line Items]
Balance as of fiscal year 2017	850.5
Purchase price adjustments- prior years' acquisitions	(0.2)
Foreign currency translation adjustments	(3.1)
Divestiture (1)	0.0	[2]
Balance as of the end of the second quarter of fiscal 2018	$ 847.2

[1] See Note 2 for a summary of adjustments

[2] In the first quarter of 2018, the Company sold its Geoline business, which was part of the Geospatial segment.