Commitments and Contingencies - Narrative (Details) $ in Millions	8 Months Ended	12 Months Ended
	Oct. 31, 2015 complaint	Oct. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Jul. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Rental expense for both cancelable and noncancelable contracts		$ 45.3	$ 38.8	$ 32.2
Number of putative class action complaints filed (over) | complaint	50
Coopervision Litigation
Loss Contingencies [Line Items]
Litigation settlement amount					$ 3.0