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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 30, 2024
Apr. 01, 2023
Mar. 30, 2024
Apr. 01, 2023
Income Statement [Abstract]        
Net revenue $ 172,074 $ 173,021 $ 343,263 $ 349,254
Cost of sales 155,603 88,929 246,896 176,456
Gross profit 16,471 84,092 96,367 172,798
Selling, general and administrative 39,450 35,464 80,843 77,840
Research and development 37,704 35,999 74,514 70,507
Impairment charges 44,472   44,472  
Operating expenses 121,626 71,463 199,829 148,347
(Loss) / Income from operations (105,155) 12,629 (103,462) 24,451
Interest income 8,848 8,000 18,747 14,559
Interest expense (18) (32) (40) (66)
(Loss) / Income before income taxes (96,325) 20,597 (84,755) 38,944
Provision for income taxes 6,355 5,556 8,632 9,314
Net (loss) / income $ (102,680) $ 15,041 $ (93,387) $ 29,630
Net (loss) / income per share:        
Basic (in dollars per share) $ (1.83) $ 0.27 $ (1.66) $ 0.52
Diluted (in dollars per share) $ (1.83) $ 0.26 $ (1.66) $ 0.51
Weighted average shares outstanding:        
Basic (in shares) 56,154 56,684 56,402 56,868
Diluted (in shares) 56,154 57,577 56,402 57,739