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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 29, 2024
Jul. 01, 2023
Jun. 29, 2024
Jul. 01, 2023
Income Statement [Abstract]        
Net revenue $ 181,650 $ 190,917 $ 524,913 $ 540,171
Cost of sales 96,920 100,899 343,816 277,355
Gross profit 84,730 90,018 181,097 262,816
Selling, general and administrative 38,516 36,393 119,359 114,233
Research and development 37,937 36,578 112,451 107,085
Impairment charges 0 21,535 44,472 21,535
Operating expenses 76,453 94,506 276,282 242,853
Income / (loss) from operations 8,277 (4,488) (95,185) 19,963
Interest income 8,060 8,847 26,807 23,406
Interest expense (20) (50) (60) (116)
Income / (loss) before income taxes 16,317 4,309 (68,438) 43,253
Provision for income taxes 4,053 148 12,685 9,462
Net income / (loss) $ 12,264 $ 4,161 $ (81,123) $ 33,791
Net income / (loss) per share:        
Basic (in dollars per share) $ 0.22 $ 0.07 $ (1.45) $ 0.60
Diluted (in dollars per share) $ 0.22 $ 0.07 $ (1.45) $ 0.59
Weighted average shares outstanding:        
Basic (in shares) 55,280 56,553 56,028 56,763
Diluted (in shares) 55,724 57,519 56,028 57,684