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Other Balance Sheet Information - Other Balance Sheet Information of Inventories (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Sep. 30, 2017
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 114.1 $ 95.7
Work-in-process 48.8 45.0
Finished goods 199.0 190.9
Inventories $ 361.9 $ 331.6