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Stock-based compensation	6 Months Ended
Stock-based compensation	Jul. 01, 2017
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 153 restricted stock units ("RSUs") at a weighted average grant-date fair value of $226.85 per unit for the three and six months ended July 1, 2017. The Company granted 182 RSUs at a weighted average grant-date fair value of $184.88 per unit for the three and six months ended July 2, 2016. The Company recognized stock-based compensation costs related to the issuance of RSUs of $13,875 ($8,419 net of taxes) and $14,470 ($8,780 net of taxes) for the three months ended July 1, 2017 and July 2, 2016, 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 $23,424 ($14,214 net of taxes) and $23,520 ($14,271 net of taxes) for the six months ended July 1, 2017 and July 2, 2016, 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 $37,970 as of July 1, 2017, and will be recognized as expense over a weighted-average period of approximately 1.74 years. The Company also recognized stock-based compensation costs related to stock options of $6 ($4 net of taxes) and $27 ($16 net of taxes) for the six months ended July 1, 2017 and July 2, 2016, respectively, which has been allocated to cost of sales and selling, general and administrative expenses.