Income Taxes - Income (loss) before income tax provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Income Tax Disclosure [Abstract]
Domestic	$ (15,194)	$ (858)	$ 2,803
Foreign	(4,889)	(218)	(17,351)
Loss before provision for income taxes	$ (20,083)	$ (1,076)	$ (14,548)