Business Combinations (Changes In Carrying Amount Of Goodwill By Operating Segment) (Detail) $ in Millions	3 Months Ended
	Mar. 30, 2018 USD ($)
Goodwill [Line Items]
Balance as of fiscal year 2017	$ 2,287.1	[1]
Additions due to acquisitions	415.6
Purchase price adjustments- prior years' acquisitions	(0.2)
Foreign currency translation adjustments	25.7
Divestiture (1)	(1.8)	[2]
Balance as of the end of the first quarter of fiscal 2018	2,726.4
Buildings and Infrastructure [Member]
Goodwill [Line Items]
Balance as of fiscal year 2017	706.8
Additions due to acquisitions	415.6
Purchase price adjustments- prior years' acquisitions	0.0
Foreign currency translation adjustments	17.3
Divestiture (1)	0.0	[2]
Balance as of the end of the first quarter of fiscal 2018	1,139.7
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	3.0
Divestiture (1)	(1.8)	[2]
Balance as of the end of the first quarter of fiscal 2018	416.5
Resources and Utilities [Member]
Goodwill [Line Items]
Balance as of fiscal year 2017	314.5
Purchase price adjustments- prior years' acquisitions	0.0
Foreign currency translation adjustments	3.9
Divestiture (1)	0.0	[2]
Balance as of the end of the first quarter of fiscal 2018	318.4
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	1.5
Divestiture (1)	0.0	[2]
Balance as of the end of the first quarter of fiscal 2018	$ 851.8

[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.