Income Taxes	6 Months Ended
Nov. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	NOTE L – Income Taxes Income tax expense for the six months ended November 30, 2018 and 2017 reflected estimated annual effective income tax rates of 23.4% and 30.0%, respectively. The annual effective income tax rates exclude any impact from the inclusion of net earnings attributable to noncontrolling interests in our consolidated statements of earnings. Net earnings attributable to noncontrolling interests are primarily a result of our WSP, Spartan, and TWB consolidated joint ventures. The earnings attributable to the noncontrolling interests in WSP, Spartan and TWB’s U.S. operations do not generate tax expense to Worthington since the investors in WSP, Spartan and TWB’s U.S. operations are taxed directly based on the earnings attributable to them. The tax expense of TWB’s wholly-owned foreign corporations is reported in our consolidated tax expense. Management is required to estimate the annual effective income tax rate based upon its forecast of annual pre-tax income for domestic and foreign operations. Our actual effective income tax rate for fiscal 2019 could be materially different from the forecasted rate as of November 30, 2018. On December 22, 2017, the U.S. government enacted tax reform, the Tax Cuts and Jobs Act (the “TCJA”), which made comprehensive changes to U.S. federal income tax laws by moving from a global to a modified territorial tax regime. The TCJA lowered the U.S. corporate income tax rate from 35% to 21% in calendar year 2018 along with the elimination of certain deductions and credits, and a one-time “deemed repatriation” of accumulated foreign earnings. We recognized a provisional income tax benefit of $38,200,000 related to the re-measurement of deferred tax assets and liabilities and a provisional income tax expense of $6,900,000 for the one-time mandatory deemed repatriation tax during fiscal 2018. During the second quarter of fiscal 2019, we finalized the accounting for the TCJA and for the six months ended November 30, 2018, we made no material adjustments to these provisional amounts.

Income Taxes

6 Months Ended

Nov. 30, 2018

NOTE L – Income Taxes

Income tax expense for the six months ended November 30, 2018 and 2017 reflected estimated annual effective income tax rates of 23.4% and 30.0%, respectively. The annual effective income tax rates exclude any impact from the inclusion of net earnings attributable to noncontrolling interests in our consolidated statements of earnings. Net earnings attributable to noncontrolling interests are primarily a result of our WSP, Spartan, and TWB consolidated joint ventures. The earnings attributable to the noncontrolling interests in WSP, Spartan and TWB’s U.S. operations do not generate tax expense to Worthington since the investors in WSP, Spartan and TWB’s U.S. operations are taxed directly based on the earnings attributable to them. The tax expense of TWB’s wholly-owned foreign corporations is reported in our consolidated tax expense. Management is required to estimate the annual effective income tax rate based upon its forecast of annual pre-tax income for domestic and foreign operations. Our actual effective income tax rate for fiscal 2019 could be materially different from the forecasted rate as of November 30, 2018.

On December 22, 2017, the U.S. government enacted tax reform, the Tax Cuts and Jobs Act (the “TCJA”), which made comprehensive changes to U.S. federal income tax laws by moving from a global to a modified territorial tax regime. The TCJA lowered the U.S. corporate income tax rate from 35% to 21% in calendar year 2018 along with the elimination of certain deductions and credits, and a one-time “deemed repatriation” of accumulated foreign earnings. We recognized a provisional income tax benefit of $38,200,000 related to the re-measurement of deferred tax assets and liabilities and a provisional income tax expense of $6,900,000 for the one-time mandatory deemed repatriation tax during fiscal 2018. During the second quarter of fiscal 2019, we finalized the accounting for the TCJA and for the six months ended November 30, 2018, we made no material adjustments to these provisional amounts.