XML 90 R76.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Employee Benefits (Schedule of Weighted-Average Asset Allocations by Asset Category) (Details) | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset Allocation | 100.00% | 100.00% | 100.00%
Cash and cash equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset Allocation | 0.90% | 4.90% | 2.20%
Corporate common stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset Allocation | 12.20% | 8.90% | 9.00%
Equity mutual funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset Allocation | 49.90% | 47.20% | 52.00%
Real estate funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset Allocation | 2.90% | 4.30% | 3.30%
Bond mutual funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset Allocation | 34.10% | 34.70% | 33.50%

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=coo_CorporateCommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquityFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=coo_BondMutualFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |