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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Oct. 02, 2021
Oct. 03, 2020
Sep. 28, 2019
Income Statement [Abstract]      
Net revenue $ 1,517,664 $ 623,176 $ 540,052
Cost of sales 820,678 325,201 285,462
Gross profit 696,986 297,975 254,590
Selling, general and administrative 147,061 116,007 116,811
Research and development 137,478 123,459 116,169
Operating expenses 284,539 239,466 232,980
Income from operations 412,447 58,509 21,610
Interest income 2,321 7,541 15,132
Interest expense (218) (1,716) (2,055)
Income before income taxes 414,550 64,334 34,687
Provision for income taxes 47,295 11,998 22,910
Share of results of equity-method investee, net of tax 94 36 124
Net income $ 367,161 $ 52,300 $ 11,653
Net income per share:      
Basic (in dollars per share) $ 5.92 $ 0.83 $ 0.18
Diluted (in dollars per share) $ 5.78 $ 0.83 $ 0.18
Weighted average shares outstanding:      
Basic (in shares) 62,009 62,828 65,286
Diluted (in shares) 63,515 63,359 65,948