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Nature of Operations and Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Accounting Policies [Abstract]      
Cash Paid for Interest $ 1,081us-gaap_InterestPaid $ 961us-gaap_InterestPaid $ 856us-gaap_InterestPaid
Cash Paid for Income Taxes 10,035us-gaap_IncomeTaxesPaidNet 8,375us-gaap_IncomeTaxesPaidNet 9,326us-gaap_IncomeTaxesPaidNet
Non-Cash Investing Activities:      
Fair Value of Assets Acquired 14,771us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1 88,398us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1 0us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1
Cash Paid for Acquired Businesses (12,658)us-gaap_PaymentsToAcquireBusinessesGross (67,453)us-gaap_PaymentsToAcquireBusinessesGross 0us-gaap_PaymentsToAcquireBusinessesGross
Liabilities Assumed of Acquired Businesses 2,113us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1 20,945us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1 0us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1
Non-Cash Financing Activities:      
Issuance of Company Common Stock 3,220us-gaap_StockIssued1 2,677us-gaap_StockIssued1 2,106us-gaap_StockIssued1
Dividends Declared but Unpaid $ 1,630us-gaap_DividendsPayableCurrentAndNoncurrent $ 1,389us-gaap_DividendsPayableCurrentAndNoncurrent $ 0us-gaap_DividendsPayableCurrentAndNoncurrent