NET INCOME PER SHARE ATTRIBUTABLE TO HEICO SHAREHOLDERS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Numerator:
Net income attributable to HEICO	$ 75,453	$ 81,782	$ 197,341	$ 161,114
Denominator:
Weighted Average Number of Shares Outstanding, Basic	134,669	133,313	134,596	133,123
Effect of dilutive stock options	2,448	3,893	2,673	3,969
Weighted Average Number of Shares Outstanding, Diluted	137,117	137,206	137,269	137,092
Earnings Per Share, Basic	$ 0.56	$ 0.61	$ 1.47	$ 1.21
Earnings Per Share, Diluted	$ 0.55	$ 0.60	$ 1.44	$ 1.18
Anti-dilutive stock options excluded	448	470	283	615