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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

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