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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textuals) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2017 | Jan. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2017 | Jul. 31, 2016
Accounting Policies [Abstract] |  |  |  |  |
Common Stock Dividend Percentage Rate | 25.00% |  |  | 25.00% |
Stockholders' Equity Note, Stock Split |  |  |  | The stock split was effected as of April 19, 2017 in the form of a 25% stock dividend distributed to shareholders of record as of April 7, 2017. All applicable share and per share information has been adjusted retrospectively to give effect to the 5-for-4 stock split. |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Net income attributable to HEICO | $ 45,698 |  | $ 42,002 | $ 132,311 | $ 111,930
Weighted Average Number of Shares Outstanding, Diluted | 86,893,000 |  | 85,348,000 | 86,645,000 | 85,102,000
Accounting Standards Update 2016-09 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  | $ 3,100 |  | $ 3,100 |
Net income attributable to HEICO |  | $ 2,600 |  |  |
Weighted Average Number of Shares Outstanding, Diluted | 808,000 |  |  | 745,000 |

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