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Segments and Geographic Information - Operating Results By Segment (Details)
$ in Thousands
 12 Months Ended
Dec. 27, 2025
USD ($)
segment
Dec. 28, 2024
USD ($)
Dec. 30, 2023
USD ($)
Segment Reporting [Abstract]      
Number of reportable segments | segment 2    
Segment Reporting Information [Line Items]      
Revenues $ 784,993 $ 763,599 $ 663,102
Cost of revenues 476,142 455,676 404,522
Gross profit $ 308,851 $ 307,923 $ 258,580
Gross margin 39.30% 40.30% 39.00%
Research and development $ 115,682 $ 121,938 $ 115,765
Selling 51,299 53,538 52,519
Marketing 18,909 21,079 22,623
Net contribution 122,961 111,368 67,673
General and administrative 62,866 67,169 57,870
Gain on sale of business 0 20,581 72,953
Operating income 57,070 64,780 82,756
Interest income 10,640 14,111 7,217
Interest expense (521) (418) (421)
Other income (expense), net 2,202 939 (285)
Income before income taxes and equity investment 69,391 79,412 89,267
Factory start-up costs 3,025 0 0
Probe Cards      
Segment Reporting Information [Line Items]      
Revenues 637,898 625,960 497,903
Systems      
Segment Reporting Information [Line Items]      
Revenues 147,095 137,639  
Operating Segments | Probe Cards      
Segment Reporting Information [Line Items]      
Revenues 637,898 625,960 497,903
Cost of revenues 379,398 366,953 312,511
Gross profit $ 258,500 $ 259,007 $ 185,392
Gross margin 40.50% 41.40% 37.20%
Research and development $ 86,295 $ 90,463 $ 83,104
Selling 29,085 31,462 26,912
Marketing 6,494 8,775 5,983
Net contribution 136,626 128,307 69,393
Operating Segments | Systems      
Segment Reporting Information [Line Items]      
Revenues 147,095 137,639 165,199
Cost of revenues 85,542 78,128 80,464
Gross profit $ 61,553 $ 59,511 $ 84,735
Gross margin 41.80% 43.20% 51.30%
Research and development $ 18,816 $ 20,617 $ 21,487
Selling 14,938 16,082 17,026
Marketing 7,472 7,184 9,367
Net contribution 20,327 15,628 36,855
Corporate and Other      
Segment Reporting Information [Line Items]      
Revenues 0 0 0
Cost of revenues 11,202 10,595 11,547
Gross profit (11,202) (10,595) (11,547)
Research and development 10,571 10,858 11,174
Selling 7,276 5,994 8,581
Marketing 4,943 5,120 7,273
Net contribution $ (33,992) $ (32,567) $ (38,575)