Income Taxes	9 Months Ended
Sep. 29, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We determine the tax provision for interim periods using an estimate of our annual effective tax rate, adjusted for discrete items, if any, that are taken into account in the relevant period. Each quarter we update our estimate of the annual effective tax rate, and if our estimated tax rate changes, we make a cumulative adjustment. H.R. 1, An Act to provide for reconciliation pursuant to titles II and V of the concurrent resolution on the budget for fiscal year 2018 ("U.S. Tax Reform"), was enacted on December 22, 2017. U.S. Tax Reform provides for, among other things, the reduction of the U.S. corporate tax rate from 35% to 21%, effective January 1, 2018. Relevant accounting guidance provides that the impact of U.S. Tax Reform, as of the date of enactment, may be provisionally recorded and adjusted during a measurement period of up to one year. As of December 30, 2017, we provisionally recorded certain impacts of U.S. Tax Reform including an adjustment to our net deferred tax liability arising from the reduction in the federal tax rate as well as the impact of mandatory deemed repatriation. Additional analysis and computations are being performed with respect to these provisional amounts. The ultimate impact as of the enactment date may differ from the provisional amounts we have recorded, possibly materially, due to among other things, additional regulatory guidance that may be issued and changes to our assumptions and interpretations. Measurement period adjustments recorded during the nine months ended September 29, 2018 did not have a significant impact on our condensed consolidated financial statements. Our effective tax rate was 20.7% and 28.9% for the first nine months of 2018 and 2017, respectively. The decrease in the effective tax rate in 2018 is primarily due to the aforementioned reduction in the U.S. corporate statutory tax rate from 35% to 21%.

Income Taxes

We determine the tax provision for interim periods using an estimate of our annual effective tax rate, adjusted for discrete items, if any, that are taken into account in the relevant period. Each quarter we update our estimate of the annual effective tax rate, and if our estimated tax rate changes, we make a cumulative adjustment.

H.R. 1, An Act to provide for reconciliation pursuant to titles II and V of the concurrent resolution on the budget for fiscal year 2018 ("U.S. Tax Reform"), was enacted on December 22, 2017. U.S. Tax Reform provides for, among other things, the reduction of the U.S. corporate tax rate from 35% to 21%, effective January 1, 2018. Relevant accounting guidance provides that the impact of U.S. Tax Reform, as of the date of enactment, may be provisionally recorded and adjusted during a measurement period of up to one year. As of December 30, 2017, we provisionally recorded certain impacts of U.S. Tax Reform including an adjustment to our net deferred tax liability arising from the reduction in the federal tax rate as well as the impact of mandatory deemed repatriation. Additional analysis and computations are being performed with respect to these provisional amounts. The ultimate impact as of the enactment date may differ from the provisional amounts we have recorded, possibly materially, due to among other things, additional regulatory guidance that may be issued and changes to our assumptions and interpretations. Measurement period adjustments recorded during the nine months ended September 29, 2018 did not have a significant impact on our condensed consolidated financial statements.

Our effective tax rate was 20.7% and 28.9% for the first nine months of 2018 and 2017, respectively. The decrease in the effective tax rate in 2018 is primarily due to the aforementioned reduction in the U.S. corporate statutory tax rate from 35% to 21%.