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Other Financial Information - Components of Inventories (Detail) - USD ($)
$ in Millions
Sep. 27, 2019
Sep. 28, 2018
Other Financial Information [Abstract]    
Raw materials and parts $ 376.5 $ 304.1
Work-in-process 71.8 50.6
Finished goods 103.2 83.4
Total inventories $ 551.5 $ 438.1