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Acquisition Acquisition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 24, 2017
Sep. 25, 2016
Dec. 24, 2017
Dec. 25, 2016
Jun. 26, 2016
Purchase Price Allocation [Line Items]          
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ 1,900 $ 2,800 $ 1,850 $ 2,775  
Cash consideration paid to shareholders         $ 13,800
Business Combination, Contingent Consideration, Liability         $ 4,600