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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Oct. 01, 2022
Income Statement [Abstract]      
Net revenue $ 706,232 $ 742,491 $ 1,503,620
Cost of sales 437,478 383,836 755,300
Gross profit 268,754 358,655 748,320
Selling, general and administrative 165,564 152,982 140,050
Research and development 151,214 144,701 136,852
Impairment charges 44,472 21,535 1,346
Operating expenses 361,250 319,218 278,248
(Loss) / Income from operations (92,496) 39,437 470,072
Interest income 34,230 32,906 7,124
Interest expense (89) (142) (208)
(Loss)/Income before income taxes (58,355) 72,201 476,988
Provision for income taxes 10,651 15,053 43,443
Net (loss)/income $ (69,006) $ 57,148 $ 433,545
Net (loss)/income per share:      
Basic (in dollars per share) $ (1.24) $ 1.01 $ 7.21
Diluted (in dollars per share) $ (1.24) $ 0.99 $ 7.09
Weighted average shares outstanding:      
Basic (in shares) 55,613 56,682 60,164
Diluted (in shares) 55,613 57,548 61,182