Income Taxes	6 Months Ended
May 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our income tax provision for the second quarter of fiscal years 2018 and 2017 reflects our estimate of the effective tax rates expected to be applicable for the full fiscal years, adjusted for any discrete events which are recorded in the period in which they occur. The estimates are reevaluated each quarter based on our estimated tax expense for the full fiscal year. Our effective income tax rate was 25% in the second quarter of fiscal year 2018 compared to 45% in the second quarter of fiscal year 2017, and 23% in the first six months of fiscal year 2018 compared to 47% in the same period last year. The primary reason for the decrease in the effective rate is due to the enactment of tax reform in the United States in December 2017. During the first quarter of fiscal year 2018, the Tax Cuts and Jobs Act was enacted in the United States. The Act reduces the U.S. federal corporate tax rate from 35% to 21% effective January 1, 2018, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, and, effective fiscal year 2019, creates new taxes on certain foreign sourced earnings. In December 2017, the SEC issued SAB 118, which directs taxpayers to consider the impact of the U.S. legislation as “provisional” when it does not have the necessary information available, prepared or analyzed (including computations) in reasonable detail to complete its accounting for the change in tax law. As of May 31, 2018, we have not completed our accounting for the tax effects of enactment of the Act, however, as described below, we have made a reasonable estimate of the effects on our existing deferred tax balances and the one-time transition tax. As a result of the Act, we re-measured certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%. However, we are still analyzing certain aspects of the Act and refining our calculations, which could potentially affect the measurement of these balances or potentially give rise to changes in deferred tax amounts. During the first quarter of fiscal year 2018, we recognized a provisional tax benefit of $1.4 million related to the re-measurement of our U.S. deferred tax balances. The one-time transition tax associated with the Act is based on our total post-1986 earnings and profits ("E&P") that we previously deferred from U.S. federal taxation. During the first quarter of fiscal year 2018, we made a provisional determination that we have an accumulated deficit in our foreign subsidiaries' E&P and thus do not have a transition tax associated with deferred foreign earnings related to the Act. We have not yet completed our calculation of the total post-1986 E&P for our foreign subsidiaries or the tax pools of our foreign subsidiaries. Further, the transition tax is based in part on the amount of those earnings held in cash and other specified assets. This amount may change when we finalize the calculation of post-1986 foreign E&P previously deferred from U.S. federal taxation and finalize the amounts held in cash or other specified assets. Our Federal income tax returns have been examined or are closed by statute for all years prior to fiscal year 2015. Our state income tax returns have been examined or are closed by statute for all years prior to fiscal year 2013. Tax authorities for certain non-U.S. jurisdictions are also examining returns. With some exceptions, we are generally not subject to tax examinations in non-U.S. jurisdictions for years prior to fiscal year 2012.

Income Taxes

Our income tax provision for the second quarter of fiscal years 2018 and 2017 reflects our estimate of the effective tax rates expected to be applicable for the full fiscal years, adjusted for any discrete events which are recorded in the period in which they occur. The estimates are reevaluated each quarter based on our estimated tax expense for the full fiscal year.

Our effective income tax rate was 25% in the second quarter of fiscal year 2018 compared to 45% in the second quarter of fiscal year 2017, and 23% in the first six months of fiscal year 2018 compared to 47% in the same period last year. The primary reason for the decrease in the effective rate is due to the enactment of tax reform in the United States in December 2017.

During the first quarter of fiscal year 2018, the Tax Cuts and Jobs Act was enacted in the United States. The Act reduces the U.S. federal corporate tax rate from 35% to 21% effective January 1, 2018, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, and, effective fiscal year 2019, creates new taxes on certain foreign sourced earnings. In December 2017, the SEC issued SAB 118, which directs taxpayers to consider the impact of the U.S. legislation as “provisional” when it does not have the necessary information available, prepared or analyzed (including computations) in reasonable detail to complete its accounting for the change in tax law. As of May 31, 2018, we have not completed our accounting for the tax effects of enactment of the Act, however, as described below, we have made a reasonable estimate of the effects on our existing deferred tax balances and the one-time transition tax.

As a result of the Act, we re-measured certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%. However, we are still analyzing certain aspects of the Act and refining our calculations, which could potentially affect the measurement of these balances or potentially give rise to changes in deferred tax amounts. During the first quarter of fiscal year 2018, we recognized a provisional tax benefit of $1.4 million related to the re-measurement of our U.S. deferred tax balances.

The one-time transition tax associated with the Act is based on our total post-1986 earnings and profits ("E&P") that we previously deferred from U.S. federal taxation. During the first quarter of fiscal year 2018, we made a provisional determination that we have an accumulated deficit in our foreign subsidiaries' E&P and thus do not have a transition tax associated with deferred foreign earnings related to the Act. We have not yet completed our calculation of the total post-1986 E&P for our foreign subsidiaries or the tax pools of our foreign subsidiaries. Further, the transition tax is based in part on the amount of those earnings held in cash and other specified assets. This amount may change when we finalize the calculation of post-1986 foreign E&P previously deferred from U.S. federal taxation and finalize the amounts held in cash or other specified assets.

Our Federal income tax returns have been examined or are closed by statute for all years prior to fiscal year 2015. Our state income tax returns have been examined or are closed by statute for all years prior to fiscal year 2013.

Tax authorities for certain non-U.S. jurisdictions are also examining returns. With some exceptions, we are generally not subject to tax examinations in non-U.S. jurisdictions for years prior to fiscal year 2012.