NET INCOME PER SHARE ATTRIBUTABLE TO HEICO SHAREHOLDERS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Numerator:
Net income attributable to HEICO	$ 121,888	$ 79,332
Denominator:
Weighted Average Number of Shares Outstanding, Basic	134,523	132,933
Effect of dilutive stock options	2,898	4,045
Weighted Average Number of Shares Outstanding, Diluted	137,421	136,978
Earnings Per Share, Basic	$ 0.91	$ 0.60
Earnings Per Share, Diluted	$ 0.89	$ 0.58
Anti-dilutive stock options excluded	117	760