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, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Numerator:
Net income attributable to HEICO	$ 59,618	$ 45,686	$ 124,770	$ 86,613
Denominator:
Weighted Average Number of Shares Outstanding, Basic	105,940	105,276	105,789	105,227
Effect of dilutive stock options	3,331	3,020	3,402	2,923
Weighted Average Number of Shares Outstanding, Diluted	109,271	108,296	109,191	108,150
Earnings Per Share, Basic	$ 0.56	$ 0.43	$ 1.18	$ 0.82
Earnings Per Share, Diluted	$ 0.55	$ 0.42	$ 1.14	$ 0.80
Anti-dilutive stock options excluded	369	577	492	395