NET INCOME PER SHARE ATTRIBUTABLE TO HEICO SHAREHOLDERS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Numerator:
Net income attributable to HEICO	$ 67,377	$ 67,086	$ 59,618	$ 65,152	$ 53,674	$ 45,698	$ 45,686	$ 40,927	$ 259,233	$ 185,985	$ 156,192
Denominator:
Weighted average common shares outstanding - basic									132,543	131,703	130,948
Effect of dilutive stock options									4,153	3,885	2,197
Weighted Average Number of Shares Outstanding, Diluted									136,696	135,588	133,145
Earnings Per Share, Basic	$ 0.51	$ 0.51	$ 0.45	$ 0.49	$ 0.41	$ 0.35	$ 0.35	$ 0.31	$ 1.96	$ 1.41	$ 1.19
Earnings Per Share, Diluted	$ 0.49	$ 0.49	$ 0.44	$ 0.48	$ 0.39	$ 0.34	$ 0.34	$ 0.30	$ 1.90	$ 1.37	$ 1.17
Anti-dilutive stock options excluded									512	799	1,133