New Accounting Standards Not Yet Adopted (Policies)	12 Months Ended
New Accounting Standards Not Yet Adopted (Policies)	Oct. 31, 2020
New Accounting Standards Not Yet Adopted [Abstract]
Credit losses	Credit losses In June 2016, the Financial Accounting Standards Board (FASB) issued new guidance for the accounting for credit losses, which changes the impairment model for most financial assets. The new guidance adds an impairment model to U.S. GAAP that is based on current expected credit losses rather than incurred losses that applies to financial assets measured at amortized cost (e.g., trade receivables). The new guidance also made limited amendments to the impairment model for available-for-sale debt securities, including but not limited to eliminating the concept of other-than-temporary impairment from that model and requiring the use of an allowance approach. The new guidance is effective for the Company’s fiscal year that began on November 1, 2020 and requires a modified retrospective approach to adoption. The Company does not expect the adoption of this guidance to have a material impact on its Consolidated Financial Statements and related disclosures.
Simplifying the test for goodwill impairment	Simplifying the test for goodwill impairment In January 2017, the FASB issued amended guidance that simplifies the test for goodwill impairment. The new guidance eliminates the second step of the quantitative goodwill impairment test. Under the amended guidance, a one-step quantitative impairment test is used to both identify the existence of goodwill impairment and to measure the amount of the goodwill impairment loss. Goodwill impairment loss is measured equal to the amount that the carrying amount of a reporting unit, including goodwill, exceeds its fair value. However, the amount of goodwill impairment loss is limited to the total amount of goodwill allocated to that reporting unit. The new guidance does not affect an entity’s option to first perform a qualitative impairment assessment for a reporting unit at any annual or interim period to determine if the quantitative impairment test is necessary. The new guidance is effective for the Company’s fiscal year that began on November 1, 2020 and requires a prospective approach to adoption. The Company intends to apply the new guidance for goodwill impairment testing beginning in fiscal 2021.
Disclosure requirements for fair value measurement	Disclosure requirements for fair value measurement In August 2018, the FASB issued guidance that makes changes to the disclosure requirements for fair value measurements. The Company early adopted certain portions of this guidance related to the removal of certain fair value disclosure requirements. The remaining portions of this guidance that were not early adopted will be effective for the Company’s fiscal year that began on November 1, 2020. Notably, this guidance removes the disclosure requirements for the valuation processes for Level 3 fair value measurements. This guidance also adds new disclosure requirements for the range and weighted average of significant unobservable inputs used to develop fair value measurements categorized within Level 3 of the fair value hierarchy. The Company does not expect the adoption of the remaining portions of this guidance to have a material impact on the disclosures to its Consolidated Financial Statements.
Capitalization of implementation costs in a cloud computing service contract	Capitalization of implementation costs in a cloud computing service contract In August 2018, the FASB issued new guidance that aligns the accounting requirements for capitalizing implementation costs (implementation, setup and other upfront costs) related to cloud computing (hosting) arrangements that are accounted for as a service contract with the accounting requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). This new guidance does not affect the accounting for the hosting (service) element of a cloud computing arrangement that is a service contract. The new guidance is effective for the Company’s fiscal year that began on November 1, 2020. The Company intends to prospectively apply the new guidance to all implementation costs incurred after the date of adoption. The Company does not expect the adoption of this guidance to have a material impact on its Consolidated Financial Statements and related disclosures.

EATON VANCE CORP 10-K