Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Income Statement [Abstract]
Revenue	$ 1,326,328	$ 1,260,823	$ 1,137,008
Cost of revenue	754,372	733,480	647,700
Gross profit	571,956	527,343	489,308
Operating expenses
Research and development	214,672	171,174	142,109
Sales and marketing	263,539	247,599	270,869
General and administrative	120,978	102,871	85,205
Total operating expenses	599,189	521,644	498,183
Operating income (loss)	(27,233)	5,699	(8,875)
Other income (expense), net
Interest income	1,998	4,349	731
Interest expense	(1,487)	(2,499)	(5,242)
Other income (expense), net	6,639	(8,625)	(1,162)
Total other income (expense), net	7,150	(6,775)	(5,673)
Loss before provision for income taxes	(20,083)	(1,076)	(14,548)
Provision for income taxes	32	3,690	1,056
Net loss	(20,115)	(4,766)	(15,604)
Net loss attributable to common stockholders, basic and diluted:	$ (20,115)	$ (4,766)	$ (15,604)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.18)	$ (0.05)	$ (0.24)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	109,807,154	103,783,006	65,706,215
Total comprehensive loss
Net loss	$ (20,115)	$ (4,766)	$ (15,604)
Change in foreign currency translation adjustment	(1,826)	1,613	488
Comprehensive loss	$ (21,941)	$ (3,153)	$ (15,116)