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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
3 Months Ended
Jul. 03, 2017
Dec. 31, 2017
Oct. 01, 2017
Goodwill [Line Items]      
Goodwill additions   $ 24,522,000  
Impairment of goodwill $ 0    
GSG      
Goodwill [Line Items]      
Goodwill additions   24,522,000  
Gross amounts of goodwill   403,400,000 $ 379,500,000
Accumulated impairment   17,700,000 17,700,000
CIG      
Goodwill [Line Items]      
Goodwill additions   0  
Gross amounts of goodwill   475,600,000 477,000,000
Accumulated impairment   97,900,000 $ 97,900,000
Glumac      
Goodwill [Line Items]      
Goodwill additions   $ 24,500,000  
Income approach      
Goodwill [Line Items]      
Weighted rate used in fair value of goodwill (as a percent)   70.00%  
Discounted cash flow and market approach      
Goodwill [Line Items]      
Weighted rate used in fair value of goodwill (as a percent)   30.00%