Summary of Significant Accounting Policies Recently Issued Accounting Standards (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

12 Months Ended

Apr. 30, 2018

Apr. 30, 2018

Apr. 30, 2017

Jul. 31, 2019

Jul. 31, 2018

Issuance of shares under share award plans, net of shares withheld for employee taxes

$ 73,690

$ 15,884

Excess Tax Benefit from Share-based Compensation, Operating Activities

$ 1,391

$ 54,473

$ 9,524

Income Tax, Policy [Policy Text Block]

Income Taxes— 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 broad and complex changes to the U.S. tax code that impacted the Company’s accounting and reporting for income taxes during the three and nine months ended April 30, 2018. These changes primarily consist of the following:

• A reduction in the U.S. federal corporate income tax rate from 35% to 21%, effective January 1, 2018, which the Company expects will result in a fiscal 2018 U.S. blended federal statutory income tax rate for the Company of approximately 27%, and then will be reduced to 21% in fiscal 2019 and thereafter, subject to future changes in the tax laws.

• The remeasurement of U.S. net deferred tax liabilities as of the effective date utilizing the new U.S. federal corporate income tax rate of 21%.

• A territorial tax regime resulting in a one-time transitional repatriation tax on unremitted foreign earnings (“Transition Tax”), which may be paid over an eight-year period.

• The elimination of the domestic production activities deduction as well as revised limitations on certain business expenses and executive compensation deductions.

On December 22, 2017, the Securities and Exchange Commission (“SEC”) staff issued Staff Accounting Bulletin No. 118 (“SAB 118”) to provide guidance that companies should apply each reporting period related to the income tax effects of the Tax Act. SAB 118 provides that companies (i) should record the effects of the changes from the Tax Act for which the accounting is complete (not provisional), (ii) should record provisional amounts for the effects of the changes from the Tax Act for which the accounting is not complete, and for which reasonable estimates can be determined, in the period they are identified, and (iii) should not record provisional amounts if reasonable estimates cannot be made for the effects of the changes from the Tax Act, and should continue to apply guidance based on the tax law in effect prior to the enactment on December 22, 2017. In addition, SAB 118 establishes a one-year measurement period (through December 22, 2018) where a provisional amount could be subject to adjustment, and requires certain qualitative and quantitative disclosures related to provisional amounts and accounting during the measurement period.

As a result of the Tax Act, the Company recorded a one-time, provisional net tax benefit of approximately $64.6 million on its Consolidated Condensed Statements of Operations for the nine months ended April 30, 2018, as described below.

Due to the reduction in the U.S. corporate tax rate, the Company remeasured its U.S. net deferred tax liabilities as of the effective date and recognized an estimated provisional benefit of approximately $71.0 million, as a discrete item in the (provision) benefit from income taxes for the nine months ended April 30, 2018, which is a reduction in net deferred tax liabilities in the accompanying Consolidated Condensed Balance Sheet as of April 30, 2018. The measurement of U.S. net deferred tax liabilities is provisional as the final remeasurement cannot be determined until the underlying temporary differences are known, rather than estimated.

The Company also recorded an estimated provisional charge for the Transition Tax of approximately $6.4 million as a discrete item in the (provision) benefit from income taxes for the nine months ended April 30, 2018. The Transition Tax recorded is provisional pending the finalization of earnings estimates of the Company’s foreign subsidiaries.

The Company is continuing to analyze the impact of the Tax Act. Adjustments to the provisional charges will be recorded as discrete items in the (provision) benefit from income taxes in the period in which those adjustments become reasonably estimable and/or the accounting is complete. Such adjustments may result from, among other things, future guidance, interpretations and regulatory changes from the Internal Revenue Service, the SEC, the FASB and/or various tax jurisdictions. The Company will complete its analysis no later than December 22, 2018 (the end of the one-year measurement period).

Impact of Tax Reform

$ 64,600

Deferred income taxes, net

71,000

Transition Tax Provisional Charge

$ 6,400

Scenario, Forecast [Member]

Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent

21.00%

27.00%