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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 03, 2017
Jul. 01, 2018
Jul. 01, 2018
Oct. 01, 2017
Goodwill [Line Items]        
Goodwill written off related to sale of divested business   $ 12,200,000 $ 12,160,000  
Impairment of goodwill $ 0      
Income approach, discounted cash flow method        
Goodwill [Line Items]        
Weighted rate used in fair value of goodwill (as a percent)     70.00%  
Market approach        
Goodwill [Line Items]        
Weighted rate used in fair value of goodwill (as a percent)     30.00%  
GSG        
Goodwill [Line Items]        
Goodwill written off related to sale of divested business     $ 0  
Gross amounts of goodwill   406,600,000 406,600,000 $ 379,500,000
Accumulated impairment   17,700,000 17,700,000 17,700,000
CIG        
Goodwill [Line Items]        
Goodwill written off related to sale of divested business     12,160,000  
Gross amounts of goodwill   504,800,000 504,800,000 477,000,000
Accumulated impairment   $ 97,900,000 $ 97,900,000 $ 97,900,000