Income Taxes	3 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded a tax provision of $22.9 million for the first quarter of fiscal 2019 as compared to $13.7 million in the same prior year period, representing effective tax rates of 11% and 8%, respectively. The prior year balance has been restated to reflect the retrospective application of the current authoritative guidance for revenue recognition. Please refer to "Note 2. Recent Accounting Changes and Accounting Pronouncements" for additional detail. On December 22, 2017, the Tax Cuts and Jobs Act (TCJA) was enacted into law. The TCJA provides numerous significant tax law changes including the reduction of the U.S. federal corporate income tax rate from 35% to 21%, the requirement for companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred and the creation of new taxes on certain foreign-sourced earnings. Some provisions of the TCJA began to impact the Company in fiscal 2018, while other provisions impact the Company beginning in fiscal 2019. In accordance with Staff Accounting Bulletin (SAB) 118, the Company has recorded provisional amounts recognizing the effect of the tax law changes in prior periods, but may adjust those provisional amounts during a measurement period that is similar to the measurement period used when accounting for business combinations. As of June 30, 2018, the Company has not adjusted the provisional estimate recorded in prior periods for effects from the one-time transition tax. The amount recorded for the one-time transition tax remains provisional as the Company has not yet finalized its calculation of the total post-1986 earnings and profits (E&P) for its foreign subsidiaries. Additionally, the Company will continue to evaluate the impact of the tax law change as it relates to providing U.S. taxes on its investments in foreign subsidiaries. Since U.S. federal taxes have been recognized through the one-time transition tax on all accumulated and previously untaxed foreign earnings through December 31, 2017, the Company does not intend to permanently reinvest those earnings. The difference between the U.S. federal statutory tax rate of 21% and the Company's effective tax rate in the first quarter of fiscal 2019 was primarily due to the beneficial impact of income earned in lower tax rate jurisdictions, which was partially offset by the new tax on low-taxed income from foreign subsidiaries. The difference between the U.S. federal statutory tax rate of 35% and the Company’s effective tax rate in the first quarter of fiscal 2018 was primarily due to income earned in lower tax rate jurisdictions, for which no U.S. income tax had been provided, as the Company had intended to permanently reinvest the earnings outside of the U.S. The Company’s total gross unrecognized tax benefits as of June 30, 2018, determined in accordance with FASB authoritative guidance for measuring uncertain tax positions, increased by $825 thousand in the first quarter of fiscal 2019 to $126.0 million. The total amount of unrecognized tax benefits that, if realized in a future period, would favorably affect the effective tax rate was $16.0 million as of June 30, 2018. Another $85.5 million would increase additional paid-in capital. The $85.5 million relates to an additional deduction claimed on federal and state amended tax returns for fiscal 2014 for repurchase premium paid in that year in connection with the early redemption of the Company’s 3.125% Junior Convertible debenture due March 15, 2037. It is reasonably possible that changes to the Company's unrecognized tax benefits could be significant in the next twelve months due to tax audit settlements and lapses of statutes of limitation. As a result of uncertainties regarding tax audit settlements and their possible outcomes, an estimate of the range of increase or decrease that could occur in the next twelve months cannot be made. The Company’s policy is to include interest and penalties related to income tax liabilities within the provision for income taxes on the condensed consolidated statements of income. The balance of accrued interest and penalties recorded in the condensed consolidated balance sheets and the amounts of interest and penalties included in the Company's provision for income taxes were not material for all periods presented. The statutes of limitations have closed for U.S. federal income tax purposes for years through fiscal 2014, for U.S. state income tax purposes for years through fiscal 2010, and for Ireland income tax purposes for years through fiscal 2013.

Income Taxes

The Company recorded a tax provision of $22.9 million for the first quarter of fiscal 2019 as compared to $13.7 million in the same prior year period, representing effective tax rates of 11% and 8%, respectively. The prior year balance has been restated to reflect the retrospective application of the current authoritative guidance for revenue recognition. Please refer to "Note 2. Recent Accounting Changes and Accounting Pronouncements" for additional detail.

On December 22, 2017, the Tax Cuts and Jobs Act (TCJA) was enacted into law. The TCJA provides numerous significant tax law changes including the reduction of the U.S. federal corporate income tax rate from 35% to 21%, the requirement for companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred and the creation of new taxes on certain foreign-sourced earnings. Some provisions of the TCJA began to impact the Company in fiscal 2018, while other provisions impact the Company beginning in fiscal 2019.

In accordance with Staff Accounting Bulletin (SAB) 118, the Company has recorded provisional amounts recognizing the effect of the tax law changes in prior periods, but may adjust those provisional amounts during a measurement period that is similar to the measurement period used when accounting for business combinations. As of June 30, 2018, the Company has not adjusted the provisional estimate recorded in prior periods for effects from the one-time transition tax. The amount recorded for the one-time transition tax remains provisional as the Company has not yet finalized its calculation of the total post-1986 earnings and profits (E&P) for its foreign subsidiaries. Additionally, the Company will continue to evaluate the impact of the tax law change as it relates to providing U.S. taxes on its investments in foreign subsidiaries. Since U.S. federal taxes have been recognized through the one-time transition tax on all accumulated and previously untaxed foreign earnings through December 31, 2017, the Company does not intend to permanently reinvest those earnings.

The difference between the U.S. federal statutory tax rate of 21% and the Company's effective tax rate in the first quarter of fiscal 2019 was primarily due to the beneficial impact of income earned in lower tax rate jurisdictions, which was partially offset by the new tax on low-taxed income from foreign subsidiaries. The difference between the U.S. federal statutory tax rate of 35% and the Company’s effective tax rate in the first quarter of fiscal 2018 was primarily due to income earned in lower tax rate jurisdictions, for which no U.S. income tax had been provided, as the Company had intended to permanently reinvest the earnings outside of the U.S.

The Company’s total gross unrecognized tax benefits as of June 30, 2018, determined in accordance with FASB authoritative guidance for measuring uncertain tax positions, increased by $825 thousand in the first quarter of fiscal 2019 to $126.0 million. The total amount of unrecognized tax benefits that, if realized in a future period, would favorably affect the effective tax rate was $16.0 million as of June 30, 2018. Another $85.5 million would increase additional paid-in capital. The $85.5 million relates to an additional deduction claimed on federal and state amended tax returns for fiscal 2014 for repurchase premium paid in that year in connection with the early redemption of the Company’s 3.125% Junior Convertible debenture due March 15, 2037. It is reasonably possible that changes to the Company's unrecognized tax benefits could be significant in the next twelve months due to tax audit settlements and lapses of statutes of limitation. As a result of uncertainties regarding tax audit settlements and their possible outcomes, an estimate of the range of increase or decrease that could occur in the next twelve months cannot be made.

The Company’s policy is to include interest and penalties related to income tax liabilities within the provision for income taxes on the condensed consolidated statements of income. The balance of accrued interest and penalties recorded in the condensed consolidated balance sheets and the amounts of interest and penalties included in the Company's provision for income taxes were not material for all periods presented.

The statutes of limitations have closed for U.S. federal income tax purposes for years through fiscal 2014, for U.S. state income tax purposes for years through fiscal 2010, and for Ireland income tax purposes for years through fiscal 2013.