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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Income Statement [Abstract]    
Net revenue $ 166,124 $ 171,189
Cost of sales 79,040 91,293
Gross profit 87,084 79,896
Selling, general and administrative 38,614 41,393
Research and development 37,808 36,810
Gain relating to cessation of business (75,987) 0
Operating expenses 435 78,203
Income from operations 86,649 1,693
Interest income 6,352 9,899
Interest expense (27) (22)
Income before income taxes 92,974 11,570
Provision for income taxes 11,332 2,277
Net income $ 81,642 $ 9,293
Net income per share:    
Basic (in dollars per share) $ 1.52 $ 0.16
Diluted (in dollars per share) $ 1.51 $ 0.16
Weighted average shares outstanding:    
Basic (in shares) 53,791 56,650
Diluted (in shares) 54,212 57,023