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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details Textuals) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Remeasurement of Deferred Tax Liabilities for Change in Tax Rate, Net | $ 11,900 |  |  |  |  |  |  |  | $ 11,900 |  |
Remeasurement of Deferred Tax Liabilities for Change in Tax Rate, Net, Per Share | $ 0.09 |  |  |  |  |  |  |  | $ 0.09 |  |
Weighted Average Number of Shares Outstanding, Diluted |  |  |  |  |  |  |  |  | 136,696,000 | 135,588,000 | 133,145,000
Net income attributable to HEICO | $ 67,377 | $ 67,086 | $ 59,618 | $ 65,152 | $ 53,674 | $ 45,698 | $ 45,686 | $ 40,927 | $ 259,233 | $ 185,985 | $ 156,192
Earnings Per Share, Basic | $ 0.51 | $ 0.51 | $ 0.45 | $ 0.49 | $ 0.41 | $ 0.35 | $ 0.35 | $ 0.31 | $ 1.96 | $ 1.41 | $ 1.19
Earnings Per Share, Diluted | $ 0.49 | $ 0.49 | $ 0.44 | $ 0.48 | $ 0.39 | $ 0.34 | $ 0.34 | $ 0.30 | $ 1.90 | $ 1.37 | $ 1.17
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  |  |  |  |  |  |  | $ 3,100 |  |  |
Weighted Average Number of Shares Outstanding, Diluted |  |  |  |  |  |  |  | 1,220,000 |  |  |
Net income attributable to HEICO |  |  |  |  |  |  |  | $ 2,600 |  |  |
Earnings Per Share, Basic |  |  |  |  |  |  |  | $ 0.02 |  |  |
Earnings Per Share, Diluted |  |  |  |  |  |  |  | $ 0.01 |  |  |

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