v3.26.3
Segment Reporting - Segment Reporting (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 02, 2026
USD ($)
Sep. 26, 2025
USD ($)
Oct. 02, 2026
USD ($)
segment
Sep. 26, 2025
USD ($)
Segment Reporting [Line Items]        
Net sales $ 567,290 $ 444,808 $ 1,731,021 $ 1,296,796
Cost of sales 463,589 358,685 1,441,142 1,051,836
Selling, general, and administrative expense 42,525 38,256 121,047 108,740
Other segment items 10,399 12,213 37,543 35,319
Segment EBIT 50,777 35,654 131,289 100,901
Depreciation, depletion, and amortization 19,719 17,504 57,333 51,551
Segment EBITDA 70,496 53,158 188,622 152,452
Income tax expense 5,840 2,698 13,116 9,960
Interest expense—net 6,605 7,544 21,709 22,691
Net income 38,332 25,412 $ 96,464 68,250
Number of reportable segments | segment     4  
Number of operating segments | segment     4  
Performance Materials        
Segment Reporting [Line Items]        
Net sales 198,978 170,787 $ 562,592 527,552
Cost of sales 151,522 125,909 432,511 385,435
Selling, general, and administrative expense 15,484 14,228 44,426 42,451
Other segment items 1,738 4,018 6,206 10,889
Segment EBIT 30,234 26,632 79,449 88,777
Depreciation, depletion, and amortization 12,274 10,279 35,162 29,901
Segment EBITDA 42,508 36,911 114,611 118,678
Performance Materials | Intersegment Eliminations        
Segment Reporting [Line Items]        
Net sales 2,900 1,000 7,700 5,600
Electronic Materials        
Segment Reporting [Line Items]        
Net sales 336,608 246,837 1,075,154 696,059
Cost of sales 291,033 213,746 949,003 611,969
Selling, general, and administrative expense 11,075 10,731 31,969 30,475
Other segment items 6,077 5,878 21,675 16,982
Segment EBIT 28,423 16,482 72,507 36,633
Depreciation, depletion, and amortization 4,713 4,443 13,990 12,971
Segment EBITDA 33,136 20,925 86,497 49,604
Precision Optics        
Segment Reporting [Line Items]        
Net sales 31,704 27,184 93,275 73,185
Cost of sales 21,030 18,892 59,618 54,211
Selling, general, and administrative expense 4,906 4,896 15,103 13,598
Other segment items 2,533 2,442 8,526 8,720
Segment EBIT 3,235 954 10,028 (3,344)
Depreciation, depletion, and amortization 2,238 2,277 6,722 7,192
Segment EBITDA 5,473 3,231 16,750 3,848
Other        
Segment Reporting [Line Items]        
Net sales 0 0 0 0
Cost of sales 4 138 10 221
Selling, general, and administrative expense 11,060 8,401 29,549 22,216
Other segment items 51 (125) 1,136 (1,272)
Segment EBIT (11,115) (8,414) (30,695) (21,165)
Depreciation, depletion, and amortization 494 505 1,459 1,487
Segment EBITDA $ (10,621) $ (7,909) $ (29,236) $ (19,678)