NET INCOME PER SHARE ATTRIBUTABLE TO HEICO SHAREHOLDERS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Numerator:
Net income attributable to HEICO	$ 70,596	$ 121,888
Denominator:
Weighted Average Number of Shares Outstanding, Basic	135,210	134,523
Effect of dilutive stock options	2,532	2,898
Weighted Average Number of Shares Outstanding, Diluted	137,742	137,421
Earnings Per Share, Basic	$ 0.52	$ 0.91
Earnings Per Share, Diluted	$ 0.51	$ 0.89
Anti-dilutive stock options excluded	28	117