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Derivative Financial Instruments - Cash Flow Hedges (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Apr. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Jul. 31, 2016
Derivatives of Cash Flow Hedges |  |  |  |  |
Reclassification of unrealized gains included in net income | $ (33) |  | $ (33) | $ 1,808 |
Cash flow hedges | Interest rate swaps |  |  |  |  |
Derivatives of Cash Flow Hedges |  |  |  |  |
Original notional value |  |  |  |  | $ 72,500
Reclassification of unrealized gains included in net income |  | $ 1,800 |  |  |
Cash flow hedges | Foreign currency forward contracts |  |  |  |  |
Derivatives of Cash Flow Hedges |  |  |  |  |
Original notional value | $ 8,400 |  | $ 8,400 |  |
Low end of range | Cash flow hedges | Foreign currency forward contracts |  |  |  |  |
Derivatives of Cash Flow Hedges |  |  |  |  |
Maturity of contracts |  |  | 1 month |  |
High end of range | Cash flow hedges | Foreign currency forward contracts |  |  |  |  |
Derivatives of Cash Flow Hedges |  |  |  |  |
Maturity of contracts |  |  | 12 months |  |

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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 Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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