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Pro Forma Results Under Acquisition (Detail) - Mobile Industrial Robots (MiR) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 01, 2018 USD ($) $ / shares
Business Acquisition [Line Items]
Revenue | $	$ 493,017
Net income | $	$ 85,151
Net income per common share, basic | $ / shares	$ 0.44
Net income per common share, diluted | $ / shares	$ 0.42

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

+ References

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-Publisher FASB
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The pro forma diluted 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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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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