Subsequent Event - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
	Apr. 25, 2018	Apr. 01, 2018
Subsequent Event [Line Items]
Cash acquired in excess of payments to acquire business		$ 25,356
Mobile Industrial Robots ApS ("MiR") | Subsequent Event
Subsequent Event [Line Items]
Cash acquired in excess of payments to acquire business	$ 148,000
Business combination, recognized identifiable assets acquired and liabilities assumed, contingent liability	$ 124,000