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Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $) | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Payment of dividends (dollars per share) | $ 0.30us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.26us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.25us-gaap_CommonStockDividendsPerShareCashPaid
Issuance of shares of common stock from the treasury (in shares) | 14,522us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued | 17,572us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued | 19,089us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued
Stock options exercised, net (shares) | 7,980synl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodNet | 13,495synl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodNet | 11,800synl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodNet
Issuance of common stock (shares) |  | 2,300,000us-gaap_StockIssuedDuringPeriodSharesNewIssues |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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