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SELECTED FINANCIAL STATEMENT INFORMATION (Details Textuals) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 31, 2025 | Jul. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024 | Oct. 31, 2024
Selected Financial Statement Information (Details) [Abstract] |  |  |  |  |
Accrued customer rebates and credits | $ 29.4 |  | $ 29.4 |  | $ 24.3
Total customer rebates and credits deducted within net sales | $ 4.9 | $ 2.7 | $ 12.8 | $ 8.5 |
SVM | Heico Electronic Technologies Corp |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Business Combination, Voting Equity Interest Acquired, Percentage | 70.00% |  | 70.00% |  |
SVM | Existing Management | Heico Electronic Technologies Corp |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 30.00% |  | 30.00% |  |
FY 2015 Acquisition | Flight Support Group [Member] |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 19.90% |  | 19.90% |  |
Noncontrolling Interest, Ownership Percentage by Parent | 95.00% |  | 95.00% |  |
Millennium | HFSC |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Business Combination, Voting Equity Interest Acquired, Percentage | 90.00% |  | 90.00% |  |
Millennium | Existing Management | HFSC |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 10.00% |  | 10.00% |  |
2019 acquisition | Electronic Technologies Group [Member] |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 15.00% |  | 15.00% |  |
Noncontrolling Interest, Ownership Percentage by Parent | 92.50% |  | 92.50% |  |
Rosen | Heico Electronic Technologies Corp |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Business Combination, Voting Equity Interest Acquired, Percentage | 100.00% |  | 100.00% |  |
ETG Pre-Acquistion | Electronic Technologies Group [Member] |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 87.90% |  | 87.90% |  |
FY 2006 Acquisition | Flight Support Group [Member] |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 19.90% |  | 19.90% |  |
Noncontrolling Interest, Ownership Percentage by Parent | 85.10% |  | 85.10% |  |
ETG Subsidiary Post Rosen Acquisition | Electronic Technologies Group [Member] |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 92.40% |  | 92.40% |  |
FY2020 Acquisition Subsidiary 1 | Flight Support Group [Member] |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 90.00% |  | 90.00% |  |
Business Combination, Voting Equity Interest Sold, Percentage | 10.00% |  | 10.00% |  |

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