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LEASES (Operating Lease Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Oct. 31, 2023 | Oct. 31, 2022
Leases, Operating [Abstract] |  |  |
Operating Lease, Cost |  | $ 24,192 | $ 19,877
Operating Lease, Variable Lease Expense |  | 4,047 | 3,552
Operating Lease, Expense | [1] | 28,239 | 23,429
Leases, Capital [Abstract] |  |  |
Finance Lease, Right-of-Use Asset, Amortization |  | 3,026 | 1,540
Finance Lease, Interest Expense |  | 1,211 | 578
Finance Lease, Variable Lease Expense |  | 617 | 319
Finance Lease Expense |  | $ 4,854 | $ 2,437
[1] | Excludes short-term lease expense, which is not material

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- Definition Finance Lease Expense + References No definition available. + Details
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Period Type: | duration

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- Definition Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance leases. + References No definition available. + Details
Name: | hei_FinanceLeaseVariableLeaseExpense
Namespace Prefix: | hei_
Data Type: | xbrli:monetaryItemType
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- Definition Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for operating leases. + References No definition available. + Details
Name: | hei_OperatingLeaseVariableLeaseExpense
Namespace Prefix: | hei_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of amortization expense attributable to right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-4 + Details
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