Income Taxes	9 Months Ended
Dec. 29, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective tax rates for the three and nine months ended December 29, 2018 are 17.3% and 12.7%, 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, partially offset by earnings generated in higher tax jurisdictions and the impact of uncertain tax positions. The decrease in the effective tax rate for the nine months ended December 29, 2018 was also due to 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 certain of 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 nine months ended December 30, 2017 were 21.2% and 18.0%, respectively. As of December 29, 2018 and March 31, 2018, the Company has liabilities related to its uncertain tax positions, including accrued interest, of approximately $126.6 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 $37.8 million during the next 12 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 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. Subsequently, as a result of finalizing its full Fiscal 2018 operating results, the issuance of new interpretive guidance, and other analyses performed, the Company finalized its accounting related to the impacts of the Tax Act and recorded immaterial measurement period adjustments in the period ending December 29, 2018.

Income Taxes

The Company’s effective tax rates for the three and nine months ended December 29, 2018 are 17.3% and 12.7%, 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, partially offset by earnings generated in higher tax jurisdictions and the impact of uncertain tax positions. The decrease in the effective tax rate for the nine months ended December 29, 2018 was also due to 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 certain of 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 nine months ended December 30, 2017 were 21.2% and 18.0%, respectively.

As of December 29, 2018 and March 31, 2018, the Company has liabilities related to its uncertain tax positions, including accrued interest, of approximately $126.6 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 $37.8 million during the next 12 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 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. Subsequently, as a result of finalizing its full Fiscal 2018 operating results, the issuance of new interpretive guidance, and other analyses performed, the Company finalized its accounting related to the impacts of the Tax Act and recorded immaterial measurement period adjustments in the period ending December 29, 2018.