9.	Income Taxes

During interim reporting periods, the effective tax rate may be impacted by changes in the mix of forecasted income from the U.S. and foreign jurisdictions where the Company operates, by changes in tax rates within those jurisdictions, or by significant unusual or infrequent items that could change assumptions used in the calculation of the income tax provision.

The estimated effective tax rate decreased to 55.0% for the six months ended January 26, 2019 from 66.5% for the six months ended January 27, 2018. The decrease in the estimated effective tax rate resulted mainly from changes in U.S. corporate income tax regulations included in the Tax Cuts and Jobs Act enacted in December 2017 (the “Tax Act”), which included:

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A reduction in the Company’s U.S. corporate income tax rate to 21% for the six months ended January 26, 2019, compared with a blended rate of 26% for the six months ended January 27, 2018.

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Certain one-time tax items, including revaluation of deferred tax assets and liabilities and the effect of a new territorial tax system, that increased the Company’s federal income tax expense by a combined $0.4 million for the six-months ended January 27, 2018. The Company did not record any similar or other unusual adjustments to federal income tax expense during the six months ended January 26, 2019.