INCOME TAXES	9 Months Ended
INCOME TAXES	Jul. 31, 2020
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	INCOME TAXES The Company's effective tax rate in the first nine months of fiscal 2020 was 3.5%, as compared to 17.1% in the first nine months of fiscal 2019. The Company recognized a discrete tax benefit from stock option exercises in both the first quarter of fiscal 2020 and 2019 of $47.6 million and $16.6 million, respectively. The $31.0 million larger benefit from stock option exercises recognized in the first quarter of fiscal 2020 was the result of more stock options exercised and the strong appreciation in HEICO's stock price during the optionees' holding periods. Further, the decrease in the first nine months of fiscal 2020 reflects a larger deduction related to Foreign-Derived Intangible Income ("FDII") principally resulting from final tax regulations that were issued in the third quarter of fiscal 2020 as part of the Tax Cuts and Jobs Act that was enacted in December 2017, as well as a larger income tax credit for qualified R&D activities. The Company's effective tax rate in the third quarter of fiscal 2020 was 13.4%, as compared to 22.0% in the third quarter of fiscal 2019. The decrease in the third quarter of fiscal 2020 principally reflects a larger deduction related to the previously mentioned FDII as well as a larger income tax credit for qualified R&D activities.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.