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Stock-based compensation	6 Months Ended
Stock-based compensation	Jun. 29, 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 18 restricted stock units (“RSUs”) at a weighted average grant-date fair value of $133.45 per unit for the three months ended June 29, 2019. The Company granted 187 RSUs at a weighted average grant-date fair value of $137.30 per unit for the six months ended June 29, 2019. The Company granted 4 RSUs at a weighted average grant-date fair value of $204.35 per unit for the three months ended June 30, 2018. The Company granted 127 at a weighted average grant-date fair value of $237.94 per unit for the six months ended June 30, 2018. The Company recognized stock-based compensation costs related to the issuance of RSUs of $5,788 ($4,283 net of taxes) and $13,645 ($10,097 net of taxes) for the three months ended June 29, 2019 and June 30, 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 $11,577 ($8,567 net of taxes) and $21,593 ($15,979 net of taxes) for the six months ended June 29, 2019 and June 30, 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 $29,629 as of June 29, 2019, and will be recognized as expense over a weighted-average period of approximately 1.70 years. The Company did not recognize any stock-based compensation costs related to stock options for the six months ended June 29, 2019 and June 30, 2018, respectively.