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Goodwill and Intangible Assets - Future Amortization Expense (Details) - USD ($)
$ in Millions
Sep. 29, 2017
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 17.4  
2019 13.0  
2020 9.3  
2021 7.2  
2022 6.0  
Thereafter 9.9  
Net carrying amount $ 62.8 $ 75.3