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Derivative Financial Instruments, Notional Amounts and Fair Values of Foreign Currency Forward Contracts Designated as Cash Flow Hedging Instruments (Details) - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands | Apr. 01, 2018 | Dec. 31, 2017 | Apr. 02, 2017
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Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivative | $ 1,273,262 | $ 1,376,877 | $ 1,722,071
Fair value of hedged item | (35,732) | (7,934) | 35,449
Inventory Purchases [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivative | 718,925 | 756,673 | 974,235
Fair value of hedged item | (31,453) | (13,695) | 35,711
Sales [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivative | 375,441 | 423,315 | 423,828
Fair value of hedged item | 7,323 | 16,144 | 1,083
Royalties and Other [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivative | 178,896 | 196,889 | 324,008
Fair value of hedged item | $ (11,602) | $ (10,383) | $ (1,345)

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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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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
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