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, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Numerator:
Net income attributable to HEICO	$ 45,698	$ 42,002	$ 132,311	$ 111,930
Denominator:
Weighted Average Number of Shares Outstanding, Basic	84,343	83,908	84,235	83,718
Effect of dilutive stock options	2,550	1,440	2,410	1,384
Weighted Average Number of Shares Outstanding, Diluted	86,893	85,348	86,645	85,102
Earnings Per Share, Basic	$ 0.54	$ 0.50	$ 1.57	$ 1.34
Earnings Per Share, Diluted	$ 0.53	$ 0.49	$ 1.53	$ 1.32
Anti-dilutive stock options excluded	706	717	446	844