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Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended			9 Months Ended
Intangible Assets - Narrative (Details) - USD ($)	Jul. 31, 2020	Jul. 31, 2019	Apr. 30, 2019	Jul. 31, 2020	Jul. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill in reporting units	$ 0	$ 0
Asset impairments				$ 0
Gain on sale of an intangible	$ 0	$ 0		$ 0	$ 19,000,000.0
CooperSurgical
Finite-Lived Intangible Assets [Line Items]
Proceeds from sale of exclusive distribution right to distribute Filshie Clip System in the U.S.			$ 21,000,000.0
Gain on sale of an intangible			$ 19,000,000.0