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EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Defined Contribution Plan Share-based Activity (Details) - shares shares in Thousands | 12 Months Ended
--- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Defined Contribution Plan Disclosure [Line Items] |  |  |
Shares available for issuance, Opening Balance | 398 | 491 | 28
Shares registered for issuance to the 401(k) Plan |  |  | 586
Issuance of common stock to 401(k) Plan | (65) | (93) | (123)
Shares available for issuance, Ending Balance | 333 | 398 | 491
Common Class A [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Shares available for issuance, Opening Balance | 398 | 491 | 28
Shares registered for issuance to the 401(k) Plan |  |  | 586
Issuance of common stock to 401(k) Plan | (65) | (93) | (123)
Shares available for issuance, Ending Balance | 333 | 398 | 491

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

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- Definition Shares Registered for Issuance to a Defined Contribution Plan + References No definition available. + Details
Name: | hei_SharesRegisteredforIssuancetoaDefinedContributionPlan
Namespace Prefix: | hei_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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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 No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |