CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Income Statement [Abstract]
Revenues	$ 424,318	$ 150,450	$ 1,032,338	$ 445,488
Cost of sales	228,623	81,027	566,667	236,398
Gross profit	195,695	69,423	465,671	209,090
Selling, general and administrative	39,103	27,905	105,511	85,723
Research and development	36,137	30,547	102,549	87,906
Operating expenses	75,240	58,452	208,060	173,629
Income from operations	120,455	10,971	257,611	35,461
Interest income	564	1,374	1,801	6,888
Interest expense	(41)	(446)	(146)	(1,690)
Income before income taxes	120,978	11,899	259,266	40,659
Income tax expense (benefit)	7,212	690	25,722	3,985
Share of results of equity-method investee, net of tax	0	58	94	158
Net income	$ 113,766	$ 11,151	$ 233,450	$ 36,516
Net income per share:
Basic (in dollars per share)	$ 1.83	$ 0.18	$ 3.76	$ 0.58
Diluted (in dollars per share)	$ 1.79	$ 0.18	$ 3.68	$ 0.57
Weighted average shares outstanding:
Basic (in shares)	62,023	62,313	62,023	63,200
Diluted (in shares)	63,485	62,833	63,364	63,755