Income Taxes	9 Months Ended
Jan. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our consolidated interim effective tax rate is based upon our expected annual operating income, statutory tax rates, and income tax laws in the various jurisdictions in which we operate. Significant or unusual items, including adjustments to accruals for tax uncertainties, are recognized in the quarter in which the related event or a change in judgment occurs. The effective tax rate of 28.5% for the nine months ended January 31, 2018, is higher than the expected tax rate of 26.1% on ordinary income for the full fiscal year, primarily due to (a) the net impact of the Tax Cuts and Jobs Act (discussed below) and (b) true-ups related to our recently-filed U.S. Federal income tax return, partially offset by (c) the excess tax benefits related to stock-based compensation and (d) a reduction in U.S. tax recorded in the first quarter of fiscal 2018 for certain prior years on foreign exchange gains in non-U.S. entities due to a change in method of accounting for U.S. tax purposes. Our expected tax rate includes current fiscal year additions for existing tax contingency items. 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 significantly revises the future ongoing U.S. corporate income tax by, among other things, lowering U.S. corporate income tax rates and implementing a territorial tax system. As we have an April 30 fiscal year-end, the lower corporate income tax rate will be phased in, resulting in a U.S. statutory federal rate of 30.4% for our fiscal year ending April 30, 2018, and 21% for subsequent fiscal years. During the quarter ended January 31, 2018, the impact of the lower tax rate resulted in a tax benefit of approximately $20 million for the three and nine months then ended. With the enactment of the Tax Act, we are evaluating our global working capital requirements and may change our current permanent reinvestment assertion in future periods. There are also certain transitional impacts of the Tax Act. As part of the transition to the new territorial tax system, the Tax Act imposes a one-time repatriation tax on deemed repatriation of historical earnings of foreign subsidiaries. In addition, the reduction of the U.S. corporate tax rate required us to adjust our U.S. deferred tax assets and liabilities to the lower federal base rate of 21%. These transitional impacts resulted in a provisional net charge of $43 million for the quarter ended January 31, 2018, comprised of a provisional repatriation U.S. tax charge of $91 million and a provisional net deferred tax benefit of $48 million. The Tax Act also established new tax laws that may impact our financial statements beginning in fiscal 2019. These new laws include, but are not limited to (a) Global Intangible Low-Tax Income (“GILTI”), a new tax on low tax foreign jurisdictions, (b) Base Erosion Anti-abuse Tax (“BEAT”), a new minimum tax, (c) repeal of the domestic production activity deduction, and (d) limitations on certain executive compensation. The changes included in the Tax Act are broad and complex. The final transition impacts of the Tax Act may differ from the above estimates, 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, any changes in accounting standards for income taxes or related interpretations in response to the Tax Act, or any updates or changes to estimates the company has utilized to calculate the transition impacts, including impacts from changes to current year earnings estimates and foreign exchange rates of foreign subsidiaries. Shortly after the Tax Act was enacted, the U.S. Securities and Exchange Commission issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (SAB 118). Under SAB 118, companies are provided a measurement period, not to extend beyond one year since the date of enactment. To the extent a company’s accounting for certain income tax effects are incomplete, the company may determine a reasonable estimate and record a provisional amount within the first reporting period in which a reasonable estimate can be determined.

Income Taxes

Our consolidated interim effective tax rate is based upon our expected annual operating income, statutory tax rates, and income tax laws in the various jurisdictions in which we operate. Significant or unusual items, including adjustments to accruals for tax uncertainties, are recognized in the quarter in which the related event or a change in judgment occurs. The effective tax rate of 28.5% for the nine months ended January 31, 2018, is higher than the expected tax rate of 26.1% on ordinary income for the full fiscal year, primarily due to (a) the net impact of the Tax Cuts and Jobs Act (discussed below) and (b) true-ups related to our recently-filed U.S. Federal income tax return, partially offset by (c) the excess tax benefits related to stock-based compensation and (d) a reduction in U.S. tax recorded in the first quarter of fiscal 2018 for certain prior years on foreign exchange gains in non-U.S. entities due to a change in method of accounting for U.S. tax purposes. Our expected tax rate includes current fiscal year additions for existing tax contingency items.

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 significantly revises the future ongoing U.S. corporate income tax by, among other things, lowering U.S. corporate income tax rates and implementing a territorial tax system. As we have an April 30 fiscal year-end, the lower corporate income tax rate will be phased in, resulting in a U.S. statutory federal rate of 30.4% for our fiscal year ending April 30, 2018, and 21% for subsequent fiscal years. During the quarter ended January 31, 2018, the impact of the lower tax rate resulted in a tax benefit of approximately $20 million for the three and nine months then ended. With the enactment of the Tax Act, we are evaluating our global working capital requirements and may change our current permanent reinvestment assertion in future periods.

There are also certain transitional impacts of the Tax Act. As part of the transition to the new territorial tax system, the Tax Act imposes a one-time repatriation tax on deemed repatriation of historical earnings of foreign subsidiaries. In addition, the reduction of the U.S. corporate tax rate required us to adjust our U.S. deferred tax assets and liabilities to the lower federal base rate of 21%. These transitional impacts resulted in a provisional net charge of $43 million for the quarter ended January 31, 2018, comprised of a provisional repatriation U.S. tax charge of $91 million and a provisional net deferred tax benefit of $48 million.

The Tax Act also established new tax laws that may impact our financial statements beginning in fiscal 2019. These new laws include, but are not limited to (a) Global Intangible Low-Tax Income (“GILTI”), a new tax on low tax foreign jurisdictions, (b) Base Erosion Anti-abuse Tax (“BEAT”), a new minimum tax, (c) repeal of the domestic production activity deduction, and (d) limitations on certain executive compensation.

The changes included in the Tax Act are broad and complex. The final transition impacts of the Tax Act may differ from the above estimates, 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, any changes in accounting standards for income taxes or related interpretations in response to the Tax Act, or any updates or changes to estimates the company has utilized to calculate the transition impacts, including impacts from changes to current year earnings estimates and foreign exchange rates of foreign subsidiaries.

Shortly after the Tax Act was enacted, the U.S. Securities and Exchange Commission issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (SAB 118). Under SAB 118, companies are provided a measurement period, not to extend beyond one year since the date of enactment. To the extent a company’s accounting for certain income tax effects are incomplete, the company may determine a reasonable estimate and record a provisional amount within the first reporting period in which a reasonable estimate can be determined.