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EMPLOYEE RETIREMENT PLANS, Defined Contribution Plan Share-based Activity (Details) - shares shares in Thousands | 12 Months Ended
--- | ---
Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2021
Defined Contribution Plan Disclosure [Line Items] |  |  |
Shares available for issuance, Opening Balance | 145 | 188 | 228
Issuance of common stock to 401(k) Plan | (48) | (43) | (40)
Shares available for issuance, Ending Balance | 97 | 145 | 188
Common Class A [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Shares available for issuance, Opening Balance | 145 | 188 | 228
Issuance of common stock to 401(k) Plan | (48) | (43) | (40)
Shares available for issuance, Ending Balance | 97 | 145 | 188

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- Definition The maximum number of shares permitted to be issued to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | hei_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480794/715-70-50-1 + Details
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Period Type: | duration

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- Definition Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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