Income taxes	6 Months Ended
Mar. 30, 2019
Income Tax Disclosure [Abstract]
Income taxes	Income taxes The Company’s tax provision and the resulting effective tax rate for interim periods is determined based upon its estimated annual effective tax rate, adjusted for the effect of discrete items arising in that quarter. The impact of such inclusions could result in a higher or lower effective tax rate during a particular quarter, based upon the mix and timing of actual earnings or losses versus annual projections. In each quarter, the Company updates its estimate of the annual effective tax rate, and if the estimated annual tax rate changes, a cumulative adjustment is made in that quarter. The Company had an income tax benefit of $0.2 million and income tax expense of $0.6 million for the three months ended March 30, 2019 and March 31, 2018, respectively. The Company had income tax expense of $2.2 million and income tax expense of $0.6 million for the six months ended March 30, 2019 and March 31, 2018, respectively. For the three and six months ended March 30, 2019, we calculated our U.S. income tax provision using the discrete method as though the interim year to date period was an annual period. The Company believes that the application of the estimated annual effective tax rate (“AETR”) method generally required by ASC 740 is impractical for the U.S. tax provision given that normal deviations in the projected pre-tax net income (loss) in the U.S. could result in a disproportionate and unreliable effective tax rate under the AETR method. For the quarter-ended March 30, 2019, the Company has maintained a full valuation allowance on its U.S. deferred tax assets due to its history of U.S. operating losses. It is possible that within the next 12 months there may be sufficient positive evidence to release a significant portion of the valuation allowance. Release of the U.S. valuation allowance would result in the establishment of certain deferred tax assets and a benefit to income tax expense for the period the release is recorded which could have a material impact on net earnings. The exact timing and amount of the valuation allowance release are subject to change based on the level of profitability achieved. Tax Cuts and Jobs Act On December 22, 2017, President Trump signed the Tax Cuts and Jobs Act (the “Tax Act”) into law, introducing significant changes to U.S. income tax law. Changes include, but are not limited to, a corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017 and the transition of U.S. international taxation from a worldwide tax system to a territorial system. The Company is subject to certain of the provisions of the Tax Act during the year ending September 28, 2019. These provisions include a new tax on global intangible low-taxed income (“GILTI”), a deduction for foreign derived intangible income (“FDII”) and a minimum tax on certain transactions deemed to erode the U.S. tax base (“BEAT”). The Company has elected to account for GILTI as a period cost. In fiscal 2019, the Company does not believe that its effective tax rate will be materially impacted by GILTI or FDII, but the Company may be subject to BEAT. The total BEAT provision for the year is subject to change based on the Company’s results of operations and new Internal Revenue Service guidance issued during the year. On December 22, 2017, the SEC issued Staff Accounting Bulletin No. 118, which allows the Company to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. During the three months ended December 29, 2018, the Company completed the accounting for the elements of the Tax Act. The Company had previously not recorded a provision related to the Tax Act and has determined further adjustment was not required.

Income taxes

The Company’s tax provision and the resulting effective tax rate for interim periods is determined based upon its estimated annual effective tax rate, adjusted for the effect of discrete items arising in that quarter. The impact of such inclusions could result in a higher or lower effective tax rate during a particular quarter, based upon the mix and timing of actual earnings or losses versus annual projections. In each quarter, the Company updates its estimate of the annual effective tax rate, and if the estimated annual tax rate changes, a cumulative adjustment is made in that quarter.

The Company had an income tax benefit of $0.2 million and income tax expense of $0.6 million for the three months ended March 30, 2019 and March 31, 2018, respectively. The Company had income tax expense of $2.2 million and income tax expense of $0.6 million for the six months ended March 30, 2019 and March 31, 2018, respectively. For the three and six months ended March 30, 2019, we calculated our U.S. income tax provision using the discrete method as though the interim year to date period was an annual period. The Company believes that the application of the estimated annual effective tax rate (“AETR”) method generally required by ASC 740 is impractical for the U.S. tax provision given that normal deviations in the projected pre-tax net income (loss) in the U.S. could result in a disproportionate and unreliable effective tax rate under the AETR method.

For the quarter-ended March 30, 2019, the Company has maintained a full valuation allowance on its U.S. deferred tax assets due to its history of U.S. operating losses. It is possible that within the next 12 months there may be sufficient positive evidence to release a significant portion of the valuation allowance. Release of the U.S. valuation allowance would result in the establishment of certain deferred tax assets and a benefit to income tax expense for the period the release is recorded which could have a material impact on net earnings. The exact timing and amount of the valuation allowance release are subject to change based on the level of profitability achieved.

Tax Cuts and Jobs Act

On December 22, 2017, President Trump signed the Tax Cuts and Jobs Act (the “Tax Act”) into law, introducing significant changes to U.S. income tax law. Changes include, but are not limited to, a corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017 and the transition of U.S. international taxation from a worldwide tax system to a territorial system.

The Company is subject to certain of the provisions of the Tax Act during the year ending September 28, 2019. These provisions include a new tax on global intangible low-taxed income (“GILTI”), a deduction for foreign derived intangible income (“FDII”) and a minimum tax on certain transactions deemed to erode the U.S. tax base (“BEAT”). The Company has elected to account for GILTI as a period cost. In fiscal 2019, the Company does not believe that its effective tax rate will be materially impacted by GILTI or FDII, but the Company may be subject to BEAT. The total BEAT provision for the year is subject to change based on the Company’s results of operations and new Internal Revenue Service guidance issued during the year.

On December 22, 2017, the SEC issued Staff Accounting Bulletin No. 118, which allows the Company to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. During the three months ended December 29, 2018, the Company completed the accounting for the elements of the Tax Act. The Company had previously not recorded a provision related to the Tax Act and has determined further adjustment was not required.