Income Taxes	6 Months Ended
Sep. 29, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes U.S. Tax Reform On December 22, 2017, President Trump signed into law new tax legislation commonly referred to as the Tax Cuts and Jobs Act (the "TCJA"), which became effective January 1, 2018. The TCJA significantly revised U.S. tax law by, among other provisions, lowering the U.S. federal statutory income tax rate from 35% to 21%, creating a territorial tax system that includes a one-time mandatory transition tax on previously deferred foreign earnings, and eliminating or reducing certain income tax deductions. ASC Topic 740, "Income Taxes," requires the effects of changes in tax laws to be recognized in the period in which the legislation is enacted. However, due to the complexity and significance of the TCJA's provisions, the SEC staff issued Staff Accounting Bulletin No. 118 ("SAB 118") on December 22, 2017, which allows companies to record the tax effects of the TCJA on a provisional basis based on a reasonable estimate, and then, if necessary, subsequently adjust such amounts during a limited measurement period as more information becomes available. The measurement period ends when a company has obtained, prepared, and analyzed the information necessary to finalize its accounting, but cannot extend beyond one year from enactment. During the third quarter of Fiscal 2018, the Company recorded charges of $231.3 million within its income tax provision in connection with the TCJA, of which $215.5 million related to the mandatory transition tax and $15.8 million related to the revaluation of the Company's deferred tax assets and liabilities. Subsequently, as a result of finalizing its full Fiscal 2018 operating results, the issuance of new interpretive guidance, and other analyses performed, the Company recorded measurement period adjustments during the fourth quarter of Fiscal 2018, whereby it reversed $6.2 million of the charges related to the mandatory transition tax and $5.5 million related to the revaluation of its deferred taxes. These reversals were partially offset by an incremental charge of $1.8 million related to the expected future remittance of certain previously deferred foreign earnings. During the second quarter of Fiscal 2019, the Company recorded an additional measurement period adjustment as a result of the issuance of new interpretive guidance related to stock-based compensation for certain executives, whereby it recorded an income tax benefit and corresponding deferred tax asset of $4.7 million. This measurement period adjustment reduced the Company's effective tax rate by 220 basis points and 130 basis points during the three-month and six-month periods ended September 29, 2018, respectively. These cumulative net charges were recorded on a provisional basis based on the Company's present interpretations of the TCJA and are subject to further refinement as additional information becomes available, including potential new or interpretative guidance issued by the FASB or the Internal Revenue Service and other tax agencies, and as further analyses are completed. The Company expects to finalize its accounting for the enactment-related impacts of the TCJA during the third quarter of Fiscal 2019. The Company is also in the process of assessing various international taxation provisions of the TCJA that became effective for the Company beginning in the first quarter of Fiscal 2019, including a minimum tax on global intangible low-taxed income ("GILTI"). The Company has tentatively decided to account for GILTI tax in the period in which it is incurred and therefore has not provided any deferred tax impacts of GILTI in its consolidated financial statements for the six months ended September 29, 2018. The Company will continue to evaluate this policy election during the remainder of Fiscal 2019. Effective Tax Rate The Company's effective tax rate, which is calculated by dividing each fiscal period's income tax provision by pretax income, was 20.7% and 19.7% during the three-month and six-month periods ended September 29, 2018, respectively, and 24.8% and 26.9% during the three-month and six-month periods ended September 30, 2017, respectively. The effective tax rates for the three-month and six-month periods ended September 29, 2018 were slightly lower than the U.S. federal statutory income tax rate of 21% reflecting the favorable impact of the SAB 118 measurement period adjustment recorded during the second quarter of Fiscal 2019, as previously discussed. The effective tax rates for the three-month and six-month periods ended September 30, 2017 were lower than the U.S. federal statutory income tax rate of 35% as a result of the proportion of earnings generated in lower taxed foreign jurisdictions versus the U.S., partially offset by the negative impact of the adoption of ASU No. 2016-09, "Improvements to Employee Share-Based Payment Accounting" ("ASU 2016-09"). Refer to Note 4 of the Fiscal 2018 10-K for further discussion of the Company's adoption of ASU 2016-09. Uncertain Income Tax Benefits The Company classifies interest and penalties related to unrecognized tax benefits as part of its income tax provision. The total amount of unrecognized tax benefits, including interest and penalties, was $80.0 million and $79.2 million as of September 29, 2018 and March 31, 2018, respectively, and is included within non-current liability for unrecognized tax benefits in the consolidated balance sheets. The total amount of unrecognized tax benefits that, if recognized, would affect the Company's effective tax rate was $70.9 million and $68.4 million as of September 29, 2018 and March 31, 2018, respectively. Future Changes in Unrecognized Tax Benefits 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, settlements of ongoing tax audits and assessments and the expiration of applicable statutes of limitations. Although the outcomes and timing of such events are highly uncertain, the Company does not anticipate that the balance of gross unrecognized tax benefits, excluding interest and penalties, will change significantly during the next twelve months. However, changes in the occurrence, expected outcomes, and timing of such events could cause the Company's current estimate to change materially in the future. The Company files a consolidated U.S. federal income tax return, as well as tax returns in various state, local, and foreign jurisdictions. The Company is generally no longer subject to examinations by the relevant tax authorities for years prior to its fiscal year ended April 3, 2010.

Income Taxes

U.S. Tax Reform

On December 22, 2017, President Trump signed into law new tax legislation commonly referred to as the Tax Cuts and Jobs Act (the "TCJA"), which became effective January 1, 2018. The TCJA significantly revised U.S. tax law by, among other provisions, lowering the U.S. federal statutory income tax rate from 35% to 21%, creating a territorial tax system that includes a one-time mandatory transition tax on previously deferred foreign earnings, and eliminating or reducing certain income tax deductions.

ASC Topic 740, "Income Taxes," requires the effects of changes in tax laws to be recognized in the period in which the legislation is enacted. However, due to the complexity and significance of the TCJA's provisions, the SEC staff issued Staff Accounting Bulletin No. 118 ("SAB 118") on December 22, 2017, which allows companies to record the tax effects of the TCJA on a provisional basis based on a reasonable estimate, and then, if necessary, subsequently adjust such amounts during a limited measurement period as more information becomes available. The measurement period ends when a company has obtained, prepared, and analyzed the information necessary to finalize its accounting, but cannot extend beyond one year from enactment.

During the third quarter of Fiscal 2018, the Company recorded charges of $231.3 million within its income tax provision in connection with the TCJA, of which $215.5 million related to the mandatory transition tax and $15.8 million related to the revaluation of the Company's deferred tax assets and liabilities. Subsequently, as a result of finalizing its full Fiscal 2018 operating results, the issuance of new interpretive guidance, and other analyses performed, the Company recorded measurement period adjustments during the fourth quarter of Fiscal 2018, whereby it reversed $6.2 million of the charges related to the mandatory transition tax and $5.5 million related to the revaluation of its deferred taxes. These reversals were partially offset by an incremental charge of $1.8 million related to the expected future remittance of certain previously deferred foreign earnings.

During the second quarter of Fiscal 2019, the Company recorded an additional measurement period adjustment as a result of the issuance of new interpretive guidance related to stock-based compensation for certain executives, whereby it recorded an income tax benefit and corresponding deferred tax asset of $4.7 million. This measurement period adjustment reduced the Company's effective tax rate by 220 basis points and 130 basis points during the three-month and six-month periods ended September 29, 2018, respectively.

These cumulative net charges were recorded on a provisional basis based on the Company's present interpretations of the TCJA and are subject to further refinement as additional information becomes available, including potential new or interpretative guidance issued by the FASB or the Internal Revenue Service and other tax agencies, and as further analyses are completed. The Company expects to finalize its accounting for the enactment-related impacts of the TCJA during the third quarter of Fiscal 2019.

The Company is also in the process of assessing various international taxation provisions of the TCJA that became effective for the Company beginning in the first quarter of Fiscal 2019, including a minimum tax on global intangible low-taxed income ("GILTI"). The Company has tentatively decided to account for GILTI tax in the period in which it is incurred and therefore has not provided any deferred tax impacts of GILTI in its consolidated financial statements for the six months ended September 29, 2018. The Company will continue to evaluate this policy election during the remainder of Fiscal 2019.

Effective Tax Rate

The Company's effective tax rate, which is calculated by dividing each fiscal period's income tax provision by pretax income, was 20.7% and 19.7% during the three-month and six-month periods ended September 29, 2018, respectively, and 24.8% and 26.9% during the three-month and six-month periods ended September 30, 2017, respectively. The effective tax rates for the three-month and six-month periods ended September 29, 2018 were slightly lower than the U.S. federal statutory income tax rate of 21% reflecting the favorable impact of the SAB 118 measurement period adjustment recorded during the second quarter of Fiscal 2019, as previously discussed. The effective tax rates for the three-month and six-month periods ended September 30, 2017 were lower than the U.S. federal statutory income tax rate of 35% as a result of the proportion of earnings generated in lower taxed foreign jurisdictions versus the U.S., partially offset by the negative impact of the adoption of ASU No. 2016-09, "Improvements to Employee Share-Based Payment Accounting" ("ASU 2016-09"). Refer to Note 4 of the Fiscal 2018 10-K for further discussion of the Company's adoption of ASU 2016-09.

Uncertain Income Tax Benefits

The Company classifies interest and penalties related to unrecognized tax benefits as part of its income tax provision. The total amount of unrecognized tax benefits, including interest and penalties, was $80.0 million and $79.2 million as of September 29, 2018 and March 31, 2018, respectively, and is included within non-current liability for unrecognized tax benefits in the consolidated balance sheets.

The total amount of unrecognized tax benefits that, if recognized, would affect the Company's effective tax rate was $70.9 million and $68.4 million as of September 29, 2018 and March 31, 2018, respectively.

Future Changes in Unrecognized Tax Benefits

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, settlements of ongoing tax audits and assessments and the expiration of applicable statutes of limitations. Although the outcomes and timing of such events are highly uncertain, the Company does not anticipate that the balance of gross unrecognized tax benefits, excluding interest and penalties, will change significantly during the next twelve months. However, changes in the occurrence, expected outcomes, and timing of such events could cause the Company's current estimate to change materially in the future.

The Company files a consolidated U.S. federal income tax return, as well as tax returns in various state, local, and foreign jurisdictions. The Company is generally no longer subject to examinations by the relevant tax authorities for years prior to its fiscal year ended April 3, 2010.