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, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Numerator:
Net income attributable to HEICO	$ 67,086	$ 45,698	$ 191,856	$ 132,311
Denominator:
Weighted Average Number of Shares Outstanding, Basic	132,794	131,786	132,422	131,618
Effect of dilutive stock options	3,939	3,985	4,148	3,764
Weighted Average Number of Shares Outstanding, Diluted	136,733	135,771	136,570	135,382
Earnings Per Share, Basic	$ 0.51	$ 0.35	$ 1.45	$ 1.01
Earnings Per Share, Diluted	$ 0.49	$ 0.34	$ 1.40	$ 0.98
Anti-dilutive stock options excluded	410	1,104	547	697