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Stock-based compensation	9 Months Ended
Stock-based compensation	Sep. 29, 2018
Share-based Compensation [Abstract]
Stock-based compensation	Stock-based compensation The Company recognizes compensation expense for all share-based payments granted based on the grant-date fair value estimated in accordance with the provisions of the FASB ASC 718-10. Compensation expense is recognized on a straight-line basis over the options’ or other awards’ estimated lives for fixed awards with ratable vesting provisions. The Company granted 3 restricted stock units ("RSUs") at a weighted average grant-date fair value of $189.39 per unit for the three months ended September 29, 2018. The Company granted 130 RSUs at a weighted average grant-date fair value of $236.82 per unit for the nine months ended September 29, 2018. The Company granted 154 RSUs at a weighted average grant-date fair value of $226.85 per unit for the nine months ended September 30, 2017. The Company recognized stock-based compensation costs related to the issuance of RSUs of $5,104 ($3,777 net of taxes) and $7,117 ($4,355 net of taxes) for the three months ended September 29, 2018 and September 30, 2017, respectively, which has been allocated to cost of sales and selling, general and administrative expenses. The Company recognized stock-based compensation costs related to the issuance of RSUs of $26,697 ($19,756 net of taxes) and $30,601 ($18,569 net of taxes) for the nine months ended September 29, 2018 and September 30, 2017, respectively, which has been allocated to cost of sales and selling, general and administrative expenses. Pre-tax unrecognized compensation expense for unvested RSUs granted to employees, net of estimated forfeitures, was $27,540 as of September 29, 2018, and will be recognized as expense over a weighted-average period of approximately 1.38 years. The Company also recognized stock-based compensation costs related to stock options of $6 ($4 net of taxes) for the nine months ended September 30, 2017 which was allocated to cost of sales and selling, general and administrative expenses.