Income Taxes	9 Months Ended
Income Taxes	Jan. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our consolidated interim effective tax rate is based on our expected annual operating income, statutory tax rates, and income tax laws in the various jurisdictions where we operate. Significant or unusual items, including adjustments to accruals for tax uncertainties, are recognized in the fiscal quarter in which the related event or a change in judgment occurs. The effective tax rate for the three months ended January 31, 2021, was 15.7% compared to 18.6% for the same period last year. The decrease in our effective tax rate for the three months ended January 31, 2021, was driven primarily by a deferred tax benefit related to a statutory rate change and an increase in the foreign derived intangible income deduction. The effective tax rate for the nine months ended January 31, 2021, was 16.2% compared to 17.1% for the same period last year. The decrease in our effective tax rate for the nine months ended January 31, 2021, was driven primarily by a deferred tax benefit related to an intercompany transfer of assets partially offset by (a) less stock-based compensation deduction, (b) a decreased benefit in the foreign derived intangible income deduction, and (c) a lower prior-year true-up benefit. We have asserted that the undistributed earnings of the majority of our foreign subsidiaries are reinvested indefinitely outside the United States. Therefore, no income taxes have been provided for any outside basis differences inherent in these subsidiaries other than those subject to the one-time repatriation tax. We have a limited number of subsidiaries that are not permanently reinvested and therefore we have recorded the deferred tax liability related to the undistributed earnings (but not for their outside basis differences).

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.