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Other Balance Sheet Information - Inventories (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Sep. 30, 2017
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 124.9 $ 95.7
Work-in-process 52.1 45.0
Finished goods 193.5 190.9
Inventories $ 370.5 $ 331.6