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Income Taxes
 3 Months Ended
Dec. 29, 2023
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Our income tax expense, deferred tax assets and liabilities, and unrecognized tax benefits reflect management's best assessment of estimated current and future liabilities. We are subject to income taxes in the U.S. and numerous foreign jurisdictions. Significant judgments and estimates are required in determining the consolidated income tax expense.
Unrecognized Tax Benefits
As of December 29, 2023, the total amount of gross unrecognized tax benefits was $78.3 million, of which $49.0 million, if recognized, would reduce our effective tax rate. As of September 29, 2023, the total amount of gross unrecognized tax benefits was $76.3 million, of which $47.2 million, if recognized, would reduce our effective tax rate. The first quarter of fiscal 2024 increase was primarily due to current year reserves for transfer pricing and interest accruals. Our liability for unrecognized tax benefits is classified within other non-current liabilities in our unaudited interim condensed consolidated balance sheets.
Effective Tax Rate
Each period, the combination of multiple different factors can impact our effective tax rate. These factors include both recurring items such as tax rates and the relative amount of income earned in foreign jurisdictions, as well as discrete items that may occur in, but are not necessarily consistent between periods.
Our effective tax rate in the first quarter of fiscal 2024 was 16.4% or a tax expense of $13.3 million and our effective tax rate in the first quarter of fiscal 2023 was 20.5% or a tax expense of $20.5 million. The decrease in our effective tax rate was primarily due to tax benefits related to settlement of stock-based awards and the mix of earnings favoring jurisdictions with lower tax rates.
On December 11, 2023, the IRS announced in a notice that taxpayers can temporarily apply the regulations in effect prior to 2022 related to U.S. federal foreign tax credits. This relief applies to foreign taxes paid or accrued in our fiscal 2024.
Compared to the Federal statutory rate of 21%, our effective tax rate for the first quarter of fiscal 2024 was lower primarily due to the mix of earnings favoring jurisdictions with lower tax rates and tax benefits related to settlement of stock-based awards.