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Financial instruments - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 02, 2017 | Jun. 26, 2016 | Jul. 02, 2017 | Jun. 26, 2016 | Dec. 31, 2016
Derivatives Fair Value [Line Items] |  |  |  |  |
Net revenues | $ 528,613,000 | $ 473,553,000 | $ 1,016,494,000 | $ 898,446,000 |
Spain, Italy, Portugal, and Greece |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Net revenues |  |  | 64,500,000 | 63,700,000 |
Cash flow hedging |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Ineffectiveness related to derivatives | 0 | 0 | 0 | 0 |
Foreign exchange contract | Designated as Hedging Instrument | Cash flow hedging |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Total notional amount for all open foreign currency forward contracts | 73,600,000 |  | 73,600,000 |  | $ 101,800,000
Foreign exchange contract | Not Designated as Hedging Instrument |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Loss related to currency forward contracts | 2,300,000 | $ 1,300,000 | 3,100,000 | $ 1,600,000 |
Total notional amount for all open foreign currency forward contracts | $ 92,200,000 |  | $ 92,200,000 |  | $ 73,400,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References 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 + Details
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