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SHARE-BASED COMPENSATION, Options Outstanding and Exercisable (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2021
Stock Options Outstanding [Abstract] |  |  |  |
Number Outstanding (in shares) | 3,435 | 4,054 | 3,629 | 4,341
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 96.14 | $ 83.74 | $ 59.44 | $ 52.16
Outstanding Weighted Average Contractual Life (in years) | 5 years 6 months |  |  |
Outstanding Aggregated Intrinsic Value (in dollars) | $ 401,816 |  |  |
Stock Options Exercisable [Abstract] |  |  |  |
Number Exercisable (in shares) | 2,286 |  |  |
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 74.05 |  |  |
Exercisable Weighted Average Contractual Life (in years) | 4 years 2 months 12 days |  |  |
Exercisable Aggregate Intrinsic Value (in dollars) | $ 320,584 |  |  |
Heico Common Stock [Member] |  |  |  |
Stock Options Outstanding [Abstract] |  |  |  |
Number Outstanding (in shares) | 1,369 |  |  |
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 100.21 |  |  |
Outstanding Weighted Average Contractual Life (in years) | 5 years 2 months 12 days |  |  |
Outstanding Aggregated Intrinsic Value (in dollars) | $ 198,153 |  |  |
Stock Options Exercisable [Abstract] |  |  |  |
Number Exercisable (in shares) | 963 |  |  |
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 76.58 |  |  |
Exercisable Weighted Average Contractual Life (in years) | 3 years 10 months 24 days |  |  |
Exercisable Aggregate Intrinsic Value (in dollars) | $ 162,143 |  |  |
Common Class A [Member] |  |  |  |
Stock Options Outstanding [Abstract] |  |  |  |
Number Outstanding (in shares) | 2,066 |  |  |
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 93.44 |  |  |
Outstanding Weighted Average Contractual Life (in years) | 5 years 8 months 12 days |  |  |
Outstanding Aggregated Intrinsic Value (in dollars) | $ 203,663 |  |  |
Stock Options Exercisable [Abstract] |  |  |  |
Number Exercisable (in shares) | 1,323 |  |  |
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 72.21 |  |  |
Exercisable Weighted Average Contractual Life (in years) | 4 years 3 months 18 days |  |  |
Exercisable Aggregate Intrinsic Value (in dollars) | $ 158,441 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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