Derivative Financial Instruments - Fair Values of Undesignated Derivative Financial Instruments (Details) - Foreign Exchange Forward - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Sep. 27, 2020	Dec. 29, 2019	Sep. 29, 2019
Derivatives, Fair Value [Line Items]
Net unrealized gains	$ 77	$ (3,807)	$ 2,290
Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Unrealized gains	3,294	0	2,630
Unrealized losses	(3,217)	0	(301)
Net unrealized gains	77	0	2,329
Accrued liabilities
Derivatives, Fair Value [Line Items]
Unrealized gains	0	13	164
Unrealized losses	0	(3,820)	(203)
Net unrealized gains	$ 0	$ (3,807)	$ (39)

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

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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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