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Goodwill and Intangible Assets, Net - Estimated Amortization Expense (Detail)
$ in Millions
Oct. 01, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 165.9
2019 146.1
2020 140.8
2021 140.7
2022 82.1
Thereafter $ 69.7