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, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Numerator:
Net income attributable to HEICO	$ 81,782	$ 59,618	$ 161,114	$ 124,770
Denominator:
Weighted Average Number of Shares Outstanding, Basic	133,313	132,425	133,123	132,237
Effect of dilutive stock options	3,893	4,163	3,969	4,252
Weighted Average Number of Shares Outstanding, Diluted	137,206	136,588	137,092	136,489
Earnings Per Share, Basic	$ 0.61	$ 0.45	$ 1.21	$ 0.94
Earnings Per Share, Diluted	$ 0.60	$ 0.44	$ 1.18	$ 0.91
Anti-dilutive stock options excluded	470	461	615	615