Income Taxes	3 Months Ended
Apr. 03, 2020
Income Tax Disclosure [Abstract]
Income Taxes	13. Income Taxes The Company determines its estimated annual effective tax rate at the end of each interim period based on full-year forecasted pre-tax income and facts known at that time. The estimated annual effective tax rate is applied to the year-to-date pre-tax income at the end of each interim period with the cumulative effect of any changes in the estimated annual effective tax rate being recorded in the fiscal quarter in which the change is determined. The tax effect of significant unusual items is reflected in the period in which they occur. Since the Company is incorporated in Canada, it is required to use Canada’s statutory tax rate of 29.0% in the determination of the estimated annual effective tax rate. The Company’s effective tax rate of (0.3)% for the three months ended April 3, 2020 differs from the Canadian statutory tax rate of 29.0% primarily due to the mix of income earned in jurisdictions with varying tax rates, estimated deductions for Foreign Derived Intangible Income, U.K. patent box deductions and other tax credits and windfall tax benefits upon vesting of certain share-based compensation awards during the period. For the three months ended April 3, 2020, the windfall tax benefits upon vesting of certain share-based compensation awards had a benefit of 19.8% on the Company’s effective tax rate. The Company’s effective tax rate of 0.6% for the three months ended March 29, 2019 differs from the Canadian statutory tax rate of 29.0% primarily due to the mix of income earned in jurisdictions with varying tax rates, estimated deductions for Foreign Derived Intangible Income, U.K. patent box deductions and other tax credits, and windfall tax benefits upon vesting of certain share-based compensation awards during the period. For the three months ended March 29, 2019, the windfall tax benefits upon vesting of certain share-based compensation awards had a benefit of 19.3% on the Company’s effective tax rate. The Company maintains a valuation allowance on some of its deferred tax assets in certain jurisdictions. A valuation allowance is required when, based upon an assessment of various factors, including recent operating loss history, anticipated future earnings, and prudent and reasonable tax planning strategies, it is more likely than not that some portion of the deferred tax assets will not be realized. On March 27, 2020, the U.S. federal government enacted the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) in response to the COVID-19 pandemic. The CARES Act is an emergency economic stimulus package which, among other things, contains numerous provisions concerning income taxes. While the Company continues to evaluate the impact of the CARES Act, it does not currently believe it will have a material impact on the Company’s income taxes or related disclosures.

Income Taxes

3 Months Ended

Apr. 03, 2020

13. Income Taxes

The Company determines its estimated annual effective tax rate at the end of each interim period based on full-year forecasted pre-tax income and facts known at that time. The estimated annual effective tax rate is applied to the year-to-date pre-tax income at the end of each interim period with the cumulative effect of any changes in the estimated annual effective tax rate being recorded in the fiscal quarter in which the change is determined. The tax effect of significant unusual items is reflected in the period in which they occur. Since the Company is incorporated in Canada, it is required to use Canada’s statutory tax rate of 29.0% in the determination of the estimated annual effective tax rate.

The Company’s effective tax rate of (0.3)% for the three months ended April 3, 2020 differs from the Canadian statutory tax rate of 29.0% primarily due to the mix of income earned in jurisdictions with varying tax rates, estimated deductions for Foreign Derived Intangible Income, U.K. patent box deductions and other tax credits and windfall tax benefits upon vesting of certain share-based compensation awards during the period. For the three months ended April 3, 2020, the windfall tax benefits upon vesting of certain share-based compensation awards had a benefit of 19.8% on the Company’s effective tax rate.

The Company’s effective tax rate of 0.6% for the three months ended March 29, 2019 differs from the Canadian statutory tax rate of 29.0% primarily due to the mix of income earned in jurisdictions with varying tax rates, estimated deductions for Foreign Derived Intangible Income, U.K. patent box deductions and other tax credits, and windfall tax benefits upon vesting of certain share-based compensation awards during the period. For the three months ended March 29, 2019, the windfall tax benefits upon vesting of certain share-based compensation awards had a benefit of 19.3% on the Company’s effective tax rate.

The Company maintains a valuation allowance on some of its deferred tax assets in certain jurisdictions. A valuation allowance is required when, based upon an assessment of various factors, including recent operating loss history, anticipated future earnings, and prudent and reasonable tax planning strategies, it is more likely than not that some portion of the deferred tax assets will not be realized.

On March 27, 2020, the U.S. federal government enacted the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) in response to the COVID-19 pandemic. The CARES Act is an emergency economic stimulus package which, among other things, contains numerous provisions concerning income taxes. While the Company continues to evaluate the impact of the CARES Act, it does not currently believe it will have a material impact on the Company’s income taxes or related disclosures.