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ACQUISITIONS ACQUISITIONS (Details 3) - Electronic Technologies Group [Member] - AAT [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Oct. 31, 2017 | Oct. 31, 2016
Business Acquisition [Line Items] |  |
Pro Forma Revenue | $ 1,582,653 | $ 1,428,336
Pro Forma Net Income (Loss) Attributable to HEICO | 220,419 | 185,070
Pro Forma Net Income Attributable to Parent | $ 198,744 | $ 165,112
Pro Forma Net Income (Loss) Per Share Attributable To Common Shareholders [Abstract] |  |
Pro Forma Earnings Per Share, Basic | $ 1.51 | $ 1.26
Pro Forma Earnings Per Share, Diluted | $ 1.47 | $ 1.24

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