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Pro Forma Results Under Acquisition (Detail) - Mobile Industrial Robots (MiR) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 01, 2018	Jul. 01, 2018
Business Acquisition [Line Items]
Revenue	$ 528,238	$ 1,021,194
Net income	$ 101,780	$ 186,787
Net income per common share, basic	$ 0.53	$ 0.97
Net income per common share, diluted	$ 0.52	$ 0.94

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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