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Accounting Policies - Narrative (Details) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2019 reporting_unit | Oct. 31, 2019 USD ($) shares | Jul. 31, 2019 USD ($) | Jul. 31, 2018 USD ($) | Oct. 31, 2019 USD ($) business_unit shares | Oct. 31, 2018 USD ($) shares | Oct. 31, 2017 USD ($) | Nov. 01, 2019 USD ($) | Nov. 01, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Number of business units | business_unit |  |  |  |  | 2 |  |  |  |
Refund liability for product returns |  | $ 11,600,000 |  |  | $ 11,600,000 |  |  |  |
Number of reporting units | reporting_unit | 3 |  |  |  |  |  |  |  |
Goodwill impairment |  |  | $ 0 | $ 0 |  |  |  |  |
Net foreign exchange loss |  |  |  |  | 2,200,000 | $ 3,400,000 | $ 1,400,000 |  |
Interest capitalized included in construction in progress |  |  |  |  | $ 6,100,000 | $ 3,900,000 |  |  |
Treasury stock repurchase (in shares) | shares |  | 4,100,000 |  |  | 4,100,000 | 3,600,000 |  |  |
Share repurchase program, common stock repurchased (in shares) | shares |  | 512,000 |  |  | 537,000 | 0 |  |  |
Minimum |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Capitalized contract cost, amortization period (or less) |  | 1 year |  |  | 1 year |  |  |  |
Minimum | Building |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 30 years |  |  |  |
Minimum | Machinery and equipment |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 3 years |  |  |  |
Maximum | Building |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 40 years |  |  |  |
Maximum | Machinery and equipment |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 15 years |  |  |  |
Accounting Standards Update 2016-16 |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect, decrease to retained earnings |  |  |  |  |  |  |  |  | $ 13,300,000
Accounting Standards Update 2016-16 | Retained Earnings |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect, decrease to retained earnings |  |  |  |  |  |  |  |  | $ 13,300,000
CooperSurgical |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Number of reporting units | reporting_unit | 2 |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-15 |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Capitalization of implementation costs of service contract |  | $ 4,100,000 |  |  | $ 4,100,000 |  |  |  |
Subsequent Event | Forecast | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Lease, right-of-use asset |  |  |  |  |  |  |  | $ 263,100,000 |
Lease, liability |  |  |  |  |  |  |  | $ 271,900,000 |

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