Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 03, 2020	Jun. 28, 2019	Jul. 03, 2020	Jun. 28, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (24,982)	$ (324,714)	$ (63,570)	$ (394,314)
Unrealized gain on short term investments, net of tax	1,697	105	400	455
Foreign currency translation gain (loss), net of tax	458	996	(477)	2,256
Other comprehensive income (loss), net of tax	2,155	1,101	(77)	2,711
Total comprehensive loss	$ (22,827)	$ (323,613)	$ (63,647)	$ (391,603)