NET INCOME PER SHARE ATTRIBUTABLE TO HEICO SHAREHOLDERS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Numerator:
Net income attributable to HEICO	$ 54,316	$ 81,098	$ 251,657	$ 242,212
Denominator:
Weighted Average Number of Shares Outstanding, Basic	134,837	133,970	134,676	133,405
Effect of dilutive stock options	2,397	3,664	2,581	3,868
Weighted Average Number of Shares Outstanding, Diluted	137,234	137,634	137,257	137,273
Earnings Per Share, Basic	$ 0.40	$ 0.61	$ 1.87	$ 1.82
Earnings Per Share, Diluted	$ 0.40	$ 0.59	$ 1.83	$ 1.76
Anti-dilutive stock options excluded	250	88	272	439