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, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Numerator:
Net income attributable to HEICO	$ 62,327	$ 54,316	$ 75,453	$ 121,888	$ 85,684	$ 81,098	$ 81,782	$ 79,332	$ 313,984	$ 327,896	$ 259,233
Denominator:
Weighted average common shares outstanding - basic									134,754	133,640	132,543
Effect of dilutive stock options									2,548	3,710	4,153
Weighted Average Number of Shares Outstanding, Diluted									137,302	137,350	136,696
Earnings Per Share, Basic	$ 0.46	$ 0.40	$ 0.56	$ 0.91	$ 0.64	$ 0.61	$ 0.61	$ 0.60	$ 2.33	$ 2.45	$ 1.96
Earnings Per Share, Diluted	$ 0.45	$ 0.40	$ 0.55	$ 0.89	$ 0.62	$ 0.59	$ 0.60	$ 0.58	$ 2.29	$ 2.39	$ 1.90
Anti-dilutive stock options excluded									258	330	512