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EMPLOYEE RETIREMENT PLANS, Defined Contribution Plan Share-based Activity (Details) - shares shares in Thousands	12 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2022
Defined Contribution Plan Disclosure [Line Items]
Shares available for issuance, Opening Balance	97	145	188
Issuance of common stock to 401(k) Plan	(46)	(48)	(43)
Shares available for issuance, Ending Balance	51	97	145
Common Class A [Member]
Defined Contribution Plan Disclosure [Line Items]
Shares available for issuance, Opening Balance	97	145	188
Issuance of common stock to 401(k) Plan	(46)	(48)	(43)
Shares available for issuance, Ending Balance	51	97	145

X

- 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

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

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

X

- 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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: