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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Apr. 03, 2021
Mar. 28, 2020
Apr. 03, 2021
Mar. 28, 2020
Income Statement [Abstract]        
Revenues $ 340,163 $ 150,741 $ 608,020 $ 295,038
Cost of sales 191,673 81,438 338,044 155,371
Gross profit 148,490 69,303 269,976 139,667
Selling, general and administrative 30,508 29,160 66,408 57,818
Research and development 34,868 29,067 66,412 57,359
Operating expenses 65,376 58,227 132,820 115,177
Income from operations 83,114 11,076 137,156 24,490
Interest income 586 2,675 1,237 5,514
Interest expense (74) (661) (106) (1,244)
Income before income taxes 83,626 13,090 138,287 28,760
Provision for income taxes 12,212 1,162 18,510 3,295
Share of results of equity-method investee, net of tax 94 40 94 100
Net income $ 71,320 $ 11,888 $ 119,683 $ 25,365
Net income per share:        
Basic (in dollars per share) $ 1.15 $ 0.19 $ 1.93 $ 0.40
Diluted (in dollars per share) $ 1.13 $ 0.19 $ 1.90 $ 0.39
Weighted average shares outstanding:        
Basic (in shares) 62,068 63,679 62,023 63,675
Diluted (in shares) 63,237 64,219 63,118 64,266