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Acquisitions and Investments in Unaffiliated Companies - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
	Jul. 31, 2018	Sep. 29, 2018	Sep. 29, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Intangible assets acquired	$ 30,000,000
Allocated fair value to purchased intangible asset	$ 33,000,000
Purchased intangible asset useful life	12 years
Investments in unaffiliated companies		$ 4,000,000	$ 7,615,000	$ 7,000,000
Minimum [Member]
Business Acquisition [Line Items]
Future contractual obligation to pay a minimum royalty	$ 3,000,000

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 fair value of assets acquired in noncash investing or financing activities.

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Amount of cash outflow to acquire investments classified as other.

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