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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 29, 2024
Mar. 31, 2023
Mar. 29, 2024
Mar. 31, 2023
Income Statement [Abstract]        
Revenue $ 181,234 $ 169,406 $ 338,382 $ 349,510
Cost of revenue 86,022 66,716 155,860 136,465
Gross profit 95,212 102,690 182,522 213,045
Operating expenses:        
Research and development 45,621 35,537 85,034 74,369
Selling, general and administrative 34,184 31,249 71,071 64,189
Total operating expenses 79,805 66,786 156,105 138,558
Income from operations 15,407 35,904 26,417 74,487
Other income (expense):        
Interest income 5,366 5,064 10,921 8,749
Interest expense (1,285) (3,430) (2,574) (6,513)
Other expense, net 0 (123) 0 (178)
Total other income 4,081 1,511 8,347 2,058
Income before income taxes 19,488 37,415 34,764 76,545
Income tax expense 4,508 11,660 7,258 21,271
Net income $ 14,980 $ 25,755 $ 27,506 $ 55,274
Net income per share:        
Income (loss) per share - Basic (usd per share) $ 0.21 $ 0.36 $ 0.38 $ 0.78
Income (loss) per share - Diluted (usd per share) $ 0.20 $ 0.36 $ 0.38 $ 0.77
Weighted average shares used:        
Basic (in shares) 72,076 70,799 71,750 70,640
Diluted (in shares) 73,272 71,402 72,779 71,388