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, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Numerator:
Net income attributable to HEICO	$ 53,674	$ 45,698	$ 45,686	$ 40,927	$ 44,262	$ 42,002	$ 38,657	$ 31,271	$ 185,985	$ 156,192	$ 133,364
Denominator:
Weighted average common shares outstanding - basic									84,290	83,807	83,425
Effect of dilutive stock options									2,486	1,406	1,339
Weighted Average Number of Shares Outstanding, Diluted									86,776	85,213	84,764
Earnings Per Share, Basic	$ 0.64	$ 0.54	$ 0.54	$ 0.49	$ 0.53	$ 0.50	$ 0.46	$ 0.37	$ 2.21	$ 1.86	$ 1.60
Earnings Per Share, Diluted	$ 0.62	$ 0.53	$ 0.53	$ 0.47	$ 0.52	$ 0.49	$ 0.45	$ 0.37	$ 2.14	$ 1.83	$ 1.57
Anti-dilutive stock options excluded									511	725	515