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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 30, 2018
Fair Value Disclosures [Abstract]  
Summary of fair values of assets and liabilities measured on a recurring basis
The following table provides a summary of the fair values of assets and liabilities measured on a recurring basis under the ASC on “Fair Value Measurements and Disclosures” (U.S. dollars in millions): 
 
Fair value measurements
 
Foreign currency forward contracts, net (liability) asset
 
March 30,
2018
 
December 29,
2017
Quoted prices in active markets for identical assets (Level 1)
$
—

 
$
—

Significant observable inputs (Level 2)
(3.2
)
 
(1.4
)
Significant unobservable inputs (Level 3)
—

 
—