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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
6 Months Ended
Jul. 02, 2018
Mar. 31, 2019
Sep. 30, 2018
Goodwill [Line Items]      
Impairment of goodwill $ 0    
Estimated fair values that exceeded their carrying values, percent (more than) 30.00%    
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]      
Gross amounts of goodwill   $ 444,400,000 $ 407,400,000
Accumulated impairment     17,700,000
CIG      
Goodwill [Line Items]      
Gross amounts of goodwill   498,900,000 507,000,000
Accumulated impairment   $ 97,900,000 $ 97,900,000