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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Apr. 02, 2022
Apr. 03, 2021
Apr. 02, 2022
Apr. 03, 2021
Income Statement [Abstract]        
Revenues $ 384,282 $ 340,163 $ 845,170 $ 608,020
Cost of sales 182,572 191,673 420,222 338,044
Gross profit 201,710 148,490 424,948 269,976
Selling, general and administrative 35,088 30,508 74,047 66,408
Research and development 37,281 34,868 70,450 66,412
Operating expenses 72,369 65,376 144,497 132,820
Income from operations 129,341 83,114 280,451 137,156
Interest income 470 586 941 1,237
Interest expense (97) (74) (137) (106)
Income before income taxes 129,714 83,626 281,255 138,287
Income tax expense (benefit) 13,713 12,212 31,648 18,510
Share of results of equity-method investee, net of tax 0 (94) 0 (94)
Net income $ 116,001 $ 71,320 $ 249,607 $ 119,683
Net income per share:        
Basic (in dollars per share) $ 1.89 $ 1.15 $ 4.03 $ 1.93
Diluted (in dollars per share) $ 1.86 $ 1.13 $ 3.97 $ 1.90
Weighted average shares outstanding:        
Basic (in shares) 61,482 62,068 61,934 62,023
Diluted (in shares) 62,435 63,237 62,907 63,118