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Stock-based compensation	9 Months Ended
Stock-based compensation	Sep. 28, 2019
Share-based Payment Arrangement, Noncash Expense [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 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 no restricted stock units (“RSUs”) for the three months ended September 28, 2019. The Company granted 187 RSUs at a weighted average grant-date fair value of $137.30 per unit for the nine months ended September 28, 2019. The Company granted 3 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 at a weighted average grant-date fair value of $236.82 per unit for the nine months ended September 29, 2018. The Company recognized stock-based compensation costs related to the issuance of RSUs of $5,651 ($4,182 net of taxes) and $5,104 ($3,777 net of taxes) for the three months ended September 28, 2019 and September 29, 2018, 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 $17,228 ($12,749 net of taxes) and $26,697 ($19,756 net of taxes) for the nine months ended September 28, 2019 and September 29, 2018, 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 $20,598 as of September 28, 2019, and will be recognized as expense over a weighted-average period of approximately 1.46 years. The Company did not recognize any stock-based compensation costs related to stock options for the nine months ended September 28, 2019 and September 29, 2018, respectively.