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Business Segment Information (Schedule of Segment Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 561.5 | $ 556.0 | $ 522.4 | $ 499.1 | $ 518.7 | $ 514.7 | $ 483.8 | $ 449.6 | $ 2,139.0 | $ 1,966.8 | $ 1,797.1
Coopervision [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,674.1 | 1,577.2 | 1,487.8
CooperSurgical [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 464.9 | 389.6 | 309.3
Toric lens [Member] | Coopervision [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 526.8 | 480.2 | 440.1
Multifocal lens [Member] | Coopervision [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 177.2 | 169.8 | 162.1
Single-use sphere lens [Member] | Coopervision [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 438.3 | 403.1 | 357.2
Non single-use sphere and other eye care products and other [Member] | Coopervision [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 531.8 | $ 524.1 | $ 528.4

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