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, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Numerator:
Net income attributable to HEICO	$ 85,684	$ 81,098	$ 81,782	$ 79,332	$ 67,377	$ 67,086	$ 59,618	$ 65,152	$ 327,896	$ 259,233	$ 185,985
Denominator:
Weighted average common shares outstanding - basic									133,640	132,543	131,703
Effect of dilutive stock options									3,710	4,153	3,885
Weighted Average Number of Shares Outstanding, Diluted									137,350	136,696	135,588
Earnings Per Share, Basic	$ 0.64	$ 0.61	$ 0.61	$ 0.60	$ 0.51	$ 0.51	$ 0.45	$ 0.49	$ 2.45	$ 1.96	$ 1.41
Earnings Per Share, Diluted	$ 0.62	$ 0.59	$ 0.60	$ 0.58	$ 0.49	$ 0.49	$ 0.44	$ 0.48	$ 2.39	$ 1.90	$ 1.37
Anti-dilutive stock options excluded									330	512	799