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Pro Forma Results Under Acquisition (Detail) - Mobile Industrial Robots (MiR) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 29, 2019	Sep. 29, 2019
Business Acquisition [Line Items]
Revenue	$ 585,238	$ 1,646,815
Net income	$ 134,911	$ 338,149
Net income per common share, basic	$ 0.80	$ 1.97
Net income per common share, diluted	$ 0.75	$ 1.89

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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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