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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2023
Oct. 01, 2022
Oct. 02, 2021
Income Statement [Abstract]      
Net revenue $ 742,491 $ 1,503,620 $ 1,517,664
Cost of sales 383,836 755,300 820,678
Gross profit 358,655 748,320 696,986
Selling, general and administrative 152,982 140,050 147,061
Research and development 144,701 136,852 137,478
Impairment charges 21,535 1,346 0
Operating expenses 319,218 278,248 284,539
Income from operations 39,437 470,072 412,447
Interest income 32,906 7,124 2,321
Interest expense (142) (208) (218)
Income before income taxes 72,201 476,988 414,550
Provision for income taxes 15,053 43,443 47,295
Share of results of equity-method investee, net of tax 0 0 94
Net income $ 57,148 $ 433,545 $ 367,161
Net income per share:      
Basic (in dollars per share) $ 1.01 $ 7.21 $ 5.92
Diluted (in dollars per share) $ 0.99 $ 7.09 $ 5.78
Weighted average shares outstanding:      
Basic (in shares) 56,682 60,164 62,009
Diluted (in shares) 57,548 61,182 63,515