Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense	$ 3.0	$ 4.1	$ 10.4	$ 13.3