NET INCOME PER SHARE ATTRIBUTABLE TO HEICO SHAREHOLDERS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Numerator:
Net income attributable to HEICO	$ 304,220	$ 313,984	$ 327,896
Denominator:
Weighted average common shares outstanding - basic	135,326	134,754	133,640
Effect of dilutive stock options	2,528	2,548	3,710
Weighted Average Number of Shares Outstanding, Diluted	137,854	137,302	137,350
Earnings Per Share, Basic	$ 2.25	$ 2.33	$ 2.45
Earnings Per Share, Diluted	$ 2.21	$ 2.29	$ 2.39
Anti-dilutive stock options excluded	185	258	330