Income Taxes	6 Months Ended
Sep. 29, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective tax rates for the three and six months ended September 29, 2018 are 9.8% and 9.6%, respectively. Such rates differ from the United Kingdom (“U.K.”) federal statutory rate of 19% primarily due to the favorable effects of global financing arrangements and excess tax benefits related to share-based compensation awards. The global financing activities are related to the Company’s 2014 move of its principal executive office from Hong Kong to the U.K. and decision to become a U.K. tax resident. In connection with this decision, the Company funded its international growth strategy through intercompany debt financing arrangements between our U.S., U.K. and Switzerland subsidiaries in December 2015. Due to the difference in the statutory income tax rates between these jurisdictions, the Company realized a lower effective tax rate. The Company’s effective tax rates for the three and six months ended September 30, 2017 were 15.2% and 15.7%, respectively. As of September 29, 2018 and March 31, 2018, the Company has liabilities related to its uncertain tax positions, including accrued interest, of approximately $124.6 million and $107.4 million, respectively, which are included in other long-term liabilities in the Company’s consolidated balance sheets. The total amount of unrecognized tax benefits relating to the Company’s tax positions is subject to change based on future events including, but not limited to, the settlements of ongoing tax audits and assessments and the expiration of applicable statutes of limitations. The Company anticipates that the balance of gross unrecognized tax benefits, excluding interest and penalties, will be reduced by approximately $37.1 million during the next twelve months, primarily due to an anticipated tax ruling regarding the deductibility of certain capital losses and anticipated audit closures. The outcomes and timing of such events are highly uncertain and changes in the occurrence, expected outcomes and timing of such events could cause the Company’s current estimate to change materially in the future. U.S. Tax Reform On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act includes significant changes to the U.S. corporate income tax system including, among other things, lowering U.S. statutory federal tax rate and implementing a territorial tax system. The U.S. statutory federal tax rate has been decreased to 21% for Fiscal 2019 and thereafter. The Tax Act also added many new provisions, including changes to bonus depreciation, limits on the deductions for executive compensation and interest expense, a tax on global intangible low-taxed income, the base erosion anti-abuse tax and a deduction for foreign derived intangible income. In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin (“SAB”) 118 to provide guidance for companies that would allow for a measurement period of up to one year after the enactment date of the Tax Act to finalize the recording of the related tax impacts. The final transition impacts of the Tax Act may differ from the above estimate, possibly materially, due to, among other things, changes in interpretations of the Tax Act, any legislative action to address questions that arise because of the Tax Act, or any changes in accounting standards for income taxes or related interpretations in response to the Tax Act. The Company’s estimates were provisional and subject to adjustment in Fiscal 2019 under the measurement period allowed by the SEC. The Company expects to finalize its accounting related to the impacts of the Tax Act on deferred taxes, valuation allowances, state tax considerations, and any remaining basis differences in its foreign subsidiaries when its income tax returns are finalized during the third quarter of Fiscal 2019. As the Company completes its analysis of the Tax Act, collects and prepares necessary data and interprets any additional guidance issued by the United States Department of the Treasury, the Internal Revenue Service and other standard-setting bodies, it may make adjustments during Fiscal 2019 to the provisional amounts recorded in Fiscal 2018.

Income Taxes

The Company’s effective tax rates for the three and six months ended September 29, 2018 are 9.8% and 9.6%, respectively. Such rates differ from the United Kingdom (“U.K.”) federal statutory rate of 19% primarily due to the favorable effects of global financing arrangements and excess tax benefits related to share-based compensation awards. The global financing activities are related to the Company’s 2014 move of its principal executive office from Hong Kong to the U.K. and decision to become a U.K. tax resident. In connection with this decision, the Company funded its international growth strategy through intercompany debt financing arrangements between our U.S., U.K. and Switzerland subsidiaries in December 2015. Due to the difference in the statutory income tax rates between these jurisdictions, the Company realized a lower effective tax rate. The Company’s effective tax rates for the three and six months ended September 30, 2017 were 15.2% and 15.7%, respectively.

As of September 29, 2018 and March 31, 2018, the Company has liabilities related to its uncertain tax positions, including accrued interest, of approximately $124.6 million and $107.4 million, respectively, which are included in other long-term liabilities in the Company’s consolidated balance sheets. The total amount of unrecognized tax benefits relating to the Company’s tax positions is subject to change based on future events including, but not limited to, the settlements of ongoing tax audits and assessments and the expiration of applicable statutes of limitations. The Company anticipates that the balance of gross unrecognized tax benefits, excluding interest and penalties, will be reduced by approximately $37.1 million during the next twelve months, primarily due to an anticipated tax ruling regarding the deductibility of certain capital losses and anticipated audit closures. The outcomes and timing of such events are highly uncertain and changes in the occurrence, expected outcomes and timing of such events could cause the Company’s current estimate to change materially in the future.

U.S. Tax Reform

On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act includes significant changes to the U.S. corporate income tax system including, among other things, lowering U.S. statutory federal tax rate and implementing a territorial tax system. The U.S. statutory federal tax rate has been decreased to 21% for Fiscal 2019 and thereafter. The Tax Act also added many new provisions, including changes to bonus depreciation, limits on the deductions for executive compensation and interest expense, a tax on global intangible low-taxed income, the base erosion anti-abuse tax and a deduction for foreign derived intangible income.

In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin (“SAB”) 118 to provide guidance for companies that would allow for a measurement period of up to one year after the enactment date of the Tax Act to finalize the recording of the related tax impacts. The final transition impacts of the Tax Act may differ from the above estimate, possibly materially, due to, among other things, changes in interpretations of the Tax Act, any legislative action to address questions that arise because of the Tax Act, or any changes in accounting standards for income taxes or related interpretations in response to the Tax Act. The Company’s estimates were provisional and subject to adjustment in Fiscal 2019 under the measurement period allowed by the SEC. The Company expects to finalize its accounting related to the impacts of the Tax Act on deferred taxes, valuation allowances, state tax considerations, and any remaining basis differences in its foreign subsidiaries when its income tax returns are finalized during the third quarter of Fiscal 2019. As the Company completes its analysis of the Tax Act, collects and prepares necessary data and interprets any additional guidance issued by the United States Department of the Treasury, the Internal Revenue Service and other standard-setting bodies, it may make adjustments during Fiscal 2019 to the provisional amounts recorded in Fiscal 2018.