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Segment Reporting (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 28, 2018
Sep. 29, 2017
Segment Reporting Information        
Net sales $ 297,193 $ 294,268 $ 909,745 $ 830,779
Intersegment sales 13,267 12,868 36,350 42,621
Operating profit (loss) 18,666 11,964 47,109 25,753
Performance Alloys and Composites        
Segment Reporting Information        
Net sales 124,103 109,393 372,104 310,487
Intersegment sales 2 54 33 113
Operating profit (loss) 16,728 6,786 38,898 12,523
Advanced Materials        
Segment Reporting Information        
Net sales 144,072 157,770 447,941 429,550
Intersegment sales 13,265 12,814 36,317 42,508
Operating profit (loss) 6,882 9,756 18,352 24,873
Precision Coatings        
Segment Reporting Information        
Net sales 29,018 27,105 89,700 90,742
Intersegment sales 0 0 0 0
Operating profit (loss) 3,499 1,613 9,107 6,145
Other        
Segment Reporting Information        
Net sales 0 0 0 0
Intersegment sales 0 0 0 0
Operating profit (loss) $ (8,443) $ (6,191) $ (19,248) $ (17,788)