Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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- Definition

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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No definition available.

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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-Paragraph 1B
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Derivative financial instruments - Narrative (Details)	3 Months Ended
Derivative financial instruments - Narrative (Details)	Mar. 30, 2019 USD ($) instruments	Mar. 31, 2018 USD ($)	Dec. 29, 2018 USD ($)
—Currency swaps
Derivative
Notional amount of derivative contracts	$ 270,000,000
Currency forward contracts
Derivative
Notional amount of derivative contracts	12,400,000		$ 0
Currency forward contracts \| Selling, general and administrative expenses \| Not designated as hedging instrument
Derivative
Gain (loss) on derivative, recognized in the income statement	2,700,000	$ (100,000)
—Currency forward contracts
Derivative
Notional amount of derivative contracts	89,200,000		108,000,000
—Interest rate caps
Derivative
Notional amount of derivative contracts	2,700,000,000		$ 2,700,000,000.0
June 30, 2020 Through June 30, 2023
Derivative
Notional amount of derivative contracts	$ 870,000,000.0
Number of deriviatives (instruments) \| instruments	3
Net investment hedges \| —Currency swaps \| Interest expense \| Derivatives designated as hedging instruments:
Derivative
Gain (loss) on derivative, recognized in the income statement	$ 2,200,000	0
Cash Flow Hedging \| Interest Rate Contract \| Interest expense \| Derivatives designated as hedging instruments:
Derivative
Gain (loss) on derivative, recognized in the income statement	$ (100,000)	$ (2,400,000)