Income Taxes	9 Months Ended
Sep. 29, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company is subject to income tax in the United States as well as other tax jurisdictions in which it conducts business. Earnings from non-U.S. activities are subject to local country income tax. For the three and nine months ended September 29, 2018, the Company recorded an expense (benefit) for income taxes of $(18.8) million and $4.2 million, respectively, for an effective tax rate of 90.2% and (2.1)%, respectively. The effective tax rate for the nine months ended September 29, 2018, was different than the statutory federal tax rate primarily due to the impact of a full valuation allowance on the Company’s U.S. deferred tax assets, the mix of income/losses between its foreign jurisdictions, and pretax losses in jurisdictions for which no tax benefit will be recognized. Included in this tax amount was a discrete tax benefit of $4.0 million in connection with a fixed assets depreciation tax method change filed with the 2017 income tax return. On December 22, 2017, the U.S. Tax Cuts and Jobs Act of 2017 (“2017 Tax Act”) was signed into law and includes several key tax provisions that affected the Company, including a reduction of the statutory corporate tax rate from 35% to 21% effective for tax years beginning after December 31, 2017, elimination of the carryback of net operating losses generated after December 31, 2017, and changes to how the United States imposes income tax on multinational corporations, among others. In December 2017, Staff Accounting Bulletin No. 118 (“SAB 118”) was issued to address U.S. GAAP application when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects by the 2017 Tax Act. For the nine months ended September 29, 2018, no changes have been made to the provisional amounts previously recorded. The Company is still finalizing certain provisional amounts and will complete its analysis within the measurement period in accordance with SAB 118. On July 24, 2018, the Ninth Circuit Court of Appeals issued an opinion in Altera Corp. v. Commissioner requiring related parties in an intercompany cost-sharing arrangement to share expenses related to share-based compensation. This opinion reversed the prior decision of the United States Tax Court. On August 7, 2018, the court withdrew the opinion issued on July 24, 2018 to allow time for a reconstituted panel of judges to confer. The Company will continue to monitor this case. For the three and nine months ended September 30, 2017, the Company recorded an expense for income taxes of $86.2 million and $51.9 million, respectively, for an effective tax rate of (317.3)% and (28.8)%, respectively. The effective tax rate for the nine months ended September 30, 2017 was different than the statutory federal tax rate primarily due to the impact of a valuation allowance recorded against U.S. deferred tax assets, and the mix of income between United States and foreign jurisdictions. The Company accounts for deferred taxes under ASC Topic 740, “Income Taxes” (“ASC 740”), which involves weighing positive and negative evidence concerning the realizability of the Company’s deferred tax assets in each jurisdiction. In evaluating its ability to realize the net deferred tax assets, the Company considered all available positive and negative evidence, including its past operating results and the forecast of future market growth, forecasted earnings, future taxable income, and prudent and feasible tax planning strategies. As of September 29, 2018, the Company maintained a full valuation allowance against all its U.S. deferred tax assets. No valuation allowance has been recorded against the Company’s foreign deferred tax assets. The Company will continue to assess the realizability of its deferred tax assets in each of the applicable jurisdictions going forward. As of September 29, 2018, the total amount of gross unrecognized tax benefits was $38.8 million, of which $25.9 million would affect the effective tax rate if recognized. The Company does not have any tax positions as of September 29, 2018 for which it is reasonably possible that the total amount of gross unrecognized tax benefits will increase or decrease within the following 12 months.

Income Taxes

The Company is subject to income tax in the United States as well as other tax jurisdictions in which it conducts business. Earnings from non-U.S. activities are subject to local country income tax.

For the three and nine months ended September 29, 2018, the Company recorded an expense (benefit) for income taxes of $(18.8) million and $4.2 million, respectively, for an effective tax rate of 90.2% and (2.1)%, respectively. The effective tax rate for the nine months ended September 29, 2018, was different than the statutory federal tax rate primarily due to the impact of a full valuation allowance on the Company’s U.S. deferred tax assets, the mix of income/losses between its foreign jurisdictions, and pretax losses in jurisdictions for which no tax benefit will be recognized. Included in this tax amount was a discrete tax benefit of $4.0 million in connection with a fixed assets depreciation tax method change filed with the 2017 income tax return.

On December 22, 2017, the U.S. Tax Cuts and Jobs Act of 2017 (“2017 Tax Act”) was signed into law and includes several key tax provisions that affected the Company, including a reduction of the statutory corporate tax rate from 35% to 21% effective for tax years beginning after December 31, 2017, elimination of the carryback of net operating losses generated after December 31, 2017, and changes to how the United States imposes income tax on multinational corporations, among others.

In December 2017, Staff Accounting Bulletin No. 118 (“SAB 118”) was issued to address U.S. GAAP application when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects by the 2017 Tax Act. For the nine months ended September 29, 2018, no changes have been made to the provisional amounts previously recorded. The Company is still finalizing certain provisional amounts and will complete its analysis within the measurement period in accordance with SAB 118.

On July 24, 2018, the Ninth Circuit Court of Appeals issued an opinion in Altera Corp. v. Commissioner requiring related parties in an intercompany cost-sharing arrangement to share expenses related to share-based compensation. This opinion reversed the prior decision of the United States Tax Court. On August 7, 2018, the court withdrew the opinion issued on July 24, 2018 to allow time for a reconstituted panel of judges to confer. The Company will continue to monitor this case.

For the three and nine months ended September 30, 2017, the Company recorded an expense for income taxes of $86.2 million and $51.9 million, respectively, for an effective tax rate of (317.3)% and (28.8)%, respectively. The effective tax rate for the nine months ended September 30, 2017 was different than the statutory federal tax rate primarily due to the impact of a valuation allowance recorded against U.S. deferred tax assets, and the mix of income between United States and foreign jurisdictions.

The Company accounts for deferred taxes under ASC Topic 740, “Income Taxes” (“ASC 740”), which involves weighing positive and negative evidence concerning the realizability of the Company’s deferred tax assets in each jurisdiction. In evaluating its ability to realize the net deferred tax assets, the Company considered all available positive and negative evidence, including its past operating results and the forecast of future market growth, forecasted earnings, future taxable income, and prudent and feasible tax planning strategies. As of September 29, 2018, the Company maintained a full valuation allowance against all its U.S. deferred tax assets. No valuation allowance has been recorded against the Company’s foreign deferred tax assets. The Company will continue to assess the realizability of its deferred tax assets in each of the applicable jurisdictions going forward.

As of September 29, 2018, the total amount of gross unrecognized tax benefits was $38.8 million, of which $25.9 million would affect the effective tax rate if recognized. The Company does not have any tax positions as of September 29, 2018 for which it is reasonably possible that the total amount of gross unrecognized tax benefits will increase or decrease within the following 12 months.