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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textuals) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2018 | Jan. 31, 2018 | Apr. 30, 2017
Summary Of Significant Accounting Policies (Details) [Abstract] |  |  |  |  |  |
Common Stock Dividend Percentage Rate |  |  |  | 25.00% | 25.00% | 25.00%
Property, Plant and Equipment [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Depreciation Methods | Depreciation and amortization is generally provided on the straight-line method over the estimated useful lives of the various assets. |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |
Business Acquisition, Transaction Costs |  |  | $ 3,200 |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Method | The Company’s intangible assets subject to amortization are amortized on the straight-line method (except for certain customer relationships amortized on an accelerated method) over the following estimated useful lives |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |
Percent of Revenue from Services Renderred | 10.00% |  |  |  |  |
Net Sales Recognized from Percentage-Of-Completion Method | 2.00% | 3.00% | 3.00% |  |  |
Proceeds from Life Insurance Policy |  |  | $ 100 |  |  |
Net Investment Related to Deferred Compensation Plan | $ 11,500 | $ 13,400 | $ 10,529 |  |  |
Subsidiary Seven [Member] | HEICO Electronic [Member] | Subsidiary Seven [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 53.10% |  |  |  |  |
Subsidiary Six [Member] | HEICO Electronic [Member] | Subsidiary Six [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 85.00% |  |  |  |  |
Subsidiary Four [Member] | HEICO Electronic [Member] | Subsidiary Four [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 95.90% |  |  |  |  |
Subsidiary Three [Member] | HEICO Electronic [Member] | Subsidiary Three [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 82.50% |  |  |  |  |
Joint Venture [Member] | Heico Aerospace [Member] | Joint Venture [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 84.00% |  |  |  |  |
Subsidiary Two [Member] | Heico Flight Support Corp [Member] | Subsidiary Two [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 84.00% |  |  |  |  |
Subsidiary Two [Member] | HEICO Electronic [Member] | Subsidiary Two [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 80.10% |  |  |  |  |
Subsidiary Two [Member] | Heico Aerospace [Member] | Subsidiary Two [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 82.30% |  |  |  |  |
Certain Subsidiaries [Member] | Heico Flight Support Corp [Member] | Subsidiaries [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 80.10% |  |  |  |  |
Heico Aerospace [Member] | Lufthansa Technik AG [Member] | Heico Aerospace [Member] | Heico Aerospace [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Percentage of interest owned by noncontrolling shareholders | 20.00% |  |  |  |  |
Subsidiary One [Member] | Heico Flight Support Corp [Member] | Subsidiary One [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 80.00% |  |  |  |  |
Subsidiary One [Member] | HEICO Electronic [Member] | Subsidiary One [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 80.10% |  |  |  |  |
Subsidiary One [Member] | Heico Aerospace [Member] | Subsidiary One [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 80.10% |  |  |  |  |
Subsidiary Five [Member] | HEICO Electronic [Member] | Subsidiary Five [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 78.00% |  |  |  |  |

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