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, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Numerator:
Net income attributable to HEICO	$ 81,098	$ 67,086	$ 242,212	$ 191,856
Denominator:
Weighted Average Number of Shares Outstanding, Basic	133,970	132,794	133,405	132,422
Effect of dilutive stock options	3,664	3,939	3,868	4,148
Weighted Average Number of Shares Outstanding, Diluted	137,634	136,733	137,273	136,570
Earnings Per Share, Basic	$ 0.61	$ 0.51	$ 1.82	$ 1.45
Earnings Per Share, Diluted	$ 0.59	$ 0.49	$ 1.76	$ 1.40
Anti-dilutive stock options excluded	88	410	439	547