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Goodwill and Intangible Assets - Summary of Change in Net Carrying Value of Goodwill (Detail) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Balance at beginning of period $ 133.2 $ 84.5
Activity from prior year acquisitions 2.4  
Activity from current year acquisitions 27.5 48.7
Activity attributable to assets held for sale (1.3)  
Balance at end of period $ 161.8 $ 133.2