Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Shareholders' Equity (Parenthetical)

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Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)
 12 Months Ended
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