Income Taxes	3 Months Ended
Dec. 28, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On December 22, 2017, the Tax Cuts and Jobs Act (the “Act”) was enacted in the United States and significantly revised the U.S. corporate income tax laws. Given the significance of the legislation, the SEC staff issued Staff Accounting Bulletin No. 118 (SAB 118), which allows registrants to record provisional amounts during a one year “measurement period” like that used when accounting for business combinations. As of December 22, 2018, we have completed our accounting for the tax effects of the enactment of the Act. For the deferred tax balances, we remeasured the U.S. deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%. The Company’s revised remeasurement resulted in cumulative charges to income tax expense of $144.4 million for the measurement period. The Act calls for a one-time tax on deemed repatriation of foreign earnings. This one-time transition tax is based on our total post-1986 earnings and profits (E&P) of certain of our foreign subsidiaries. We have recorded $14.3 million in cumulative transition taxes during the measurement period, although the transition tax is expected to be offset by foreign tax credits in the future and resulting in no additional cash tax liability. In addition, the Company recorded $104.2 million in cumulative valuation expense charges during the measurement period with respect to certain foreign tax credit deferred tax assets as a result of the Tax Act and CH2M integration. The Company’s effective tax rate from continuing operations increased to 24.7% for first quarter fiscal 2019, up significantly in comparison to the effective tax rate of (405.8)% from continuing operations for the corresponding period last year. This increase was due primarily to nonrecurring tax items included in first quarter fiscal 2018 income taxes associated with valuation charges of $53.0 million on foreign tax credits and a partially offsetting $24.0 million benefit from the remeasurement of deferred taxes in accordance with changes in tax rates from the Act. See Note 7- Discontinued Operations - Sale of Energy, Chemicals and Resources ("ECR") Business for further information on the Company's discontinued operations reporting for the sale of the ECR business. The amount of income taxes the Company pays is subject to ongoing audits by tax jurisdictions around the world. In the normal course of business, the Company is subject to examination by tax authorities throughout the world, including such major jurisdictions as Australia, Canada, India, the Netherlands, the United Kingdom and the United States. Our estimate of the potential outcome of any uncertain tax issue is subject to our assessment of the relevant risks, facts, and circumstances existing at the time. The Company believes that it has adequately provided for reasonably foreseeable outcomes related to these matters. However, future results may include favorable or unfavorable adjustments to our estimated tax liabilities in the period the assessments are made or resolved, which may impact our effective tax rate. It is reasonably possible that, during the next twelve months, we may realize a decrease in our uncertain tax positions of approximately $12.6 million as a result of concluding various tax audits and closing tax years.

Income Taxes

On December 22, 2017, the Tax Cuts and Jobs Act (the “Act”) was enacted in the United States and significantly revised the U.S. corporate income tax laws. Given the significance of the legislation, the SEC staff issued Staff Accounting Bulletin No. 118 (SAB 118), which allows registrants to record provisional amounts during a one year “measurement period” like that used when accounting for business combinations. As of December 22, 2018, we have completed our accounting for the tax effects of the enactment of the Act. For the deferred tax balances, we remeasured the U.S. deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%. The Company’s revised remeasurement resulted in cumulative charges to income tax expense of $144.4 million for the measurement period. The Act calls for a one-time tax on deemed repatriation of foreign earnings. This one-time transition tax is based on our total post-1986 earnings and profits (E&P) of certain of our foreign subsidiaries. We have recorded $14.3 million in cumulative transition taxes during the measurement period, although the transition tax is expected to be offset by foreign tax credits in the future and resulting in no additional cash tax liability. In addition, the Company recorded $104.2 million in cumulative valuation expense charges during the measurement period with respect to certain foreign tax credit deferred tax assets as a result of the Tax Act and CH2M integration.

The Company’s effective tax rate from continuing operations increased to 24.7% for first quarter fiscal 2019, up significantly in comparison to the effective tax rate of (405.8)% from continuing operations for the corresponding period last year. This increase was due primarily to nonrecurring tax items included in first quarter fiscal 2018 income taxes associated with valuation charges of $53.0 million on foreign tax credits and a partially offsetting $24.0 million benefit from the remeasurement of deferred taxes in accordance with changes in tax rates from the Act. See Note 7- Discontinued Operations - Sale of Energy, Chemicals and Resources ("ECR") Business for further information on the Company's discontinued operations reporting for the sale of the ECR business.

The amount of income taxes the Company pays is subject to ongoing audits by tax jurisdictions around the world. In the normal course of business, the Company is subject to examination by tax authorities throughout the world, including such major jurisdictions as Australia, Canada, India, the Netherlands, the United Kingdom and the United States. Our estimate of the potential outcome of any uncertain tax issue is subject to our assessment of the relevant risks, facts, and circumstances existing at the time. The Company believes that it has adequately provided for reasonably foreseeable outcomes related to these matters. However, future results may include favorable or unfavorable adjustments to our estimated tax liabilities in the period the assessments are made or resolved, which may impact our effective tax rate. It is reasonably possible that, during the next twelve months, we may realize a decrease in our uncertain tax positions of approximately $12.6 million as a result of concluding various tax audits and closing tax years.