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REDEEMABLE NONCONTROLLING INTERESTS (Details Textuals) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2023 | Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2021 | May 31, 2022 | May 31, 2021 | Jun. 30, 2020 | May 31, 2020
Temporary Equity Disclosure [Abstract] |  |  |  |  |  |  |  |
Aggregate Redemption Amount Puttable |  | $ 152.9 |  |  |  |  |  |
Potential Redemption Amount Payable |  | 92.4 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisitions of noncontrolling interests |  | $ (2.7) | $ (8.7) | $ (2.3) |  |  |  |
FY 2015 Acquisition [Member] | Flight Support Group [Member] | Flight Support Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 19.90% |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 85.10% |  |  |  |  |  |
FY 2017 Acquisition [Member] | Flight Support Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  | 9.95% |  |  |
FY 2017 Acquisition [Member] | Flight Support Group [Member] | Flight Support Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  | 19.90% |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 90.05% |  |  |  |  |  |
FY2015 Acquisition 2 | Flight Support Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of Voting Interests Sold |  | 3.00% |  |  |  |  |  |
FY2015 Acquisition 2 | Flight Support Group [Member] | Flight Support Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  | 20.00%
Noncontrolling Interest, Ownership Percentage by Parent |  | 82.00% |  |  |  |  |  |
FY2018 Acquisition 1 | Flight Support Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of Voting Interests Sold |  | 10.00% |  |  |  |  |  |
FY2018 Acquisition 1 | Flight Support Group [Member] | Flight Support Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 90.00% |  |  |  |  |  |
FY2008 Acquisition [Member] | Flight Support Group [Member] | Flight Support Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  | 17.70% |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  | 90.00% | 86.20% |
Exxelia | HEICO Electronic [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 93.69% |  |  |  |  |  |
Exxelia | Existing Management [Member] | HEICO Electronic [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 6.31% |  |  |  |  |  |
Percent of ownership sold during the period | 2.72% |  |  |  |  |  |  |
Exxelia | Exxelia | HEICO Electronic [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 90.97% |  |  |  |  |  |
Alcon | HEICO Electronic [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 90.00% |  |  |  |  |  |
Alcon | Existing Management [Member] | HEICO Electronic [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 10.00% |  |  |  |  |  |

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