SHARE-BASED COMPENSATION, Options Outstanding and Exercisable (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Number Outstanding (in shares)	3,338	3,335	3,264	3,142
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 27.79	$ 25.52	$ 22.59	$ 21.48
Outstanding Weighted Average Contractual Life (in years)	5 years 2 months 12 days
Outstanding Aggregated Intrinsic Value (in dollars)	$ 120,198
Number Exercisable (in shares)	2,362
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 21.95
Exercisable Weighted Average Contractual Life (in years)	4 years 1 month 6 days
Exercisable Aggregate Intrinsic Value (in dollars)	$ 100,810
Heico Common Stock [Member]
Number Outstanding (in shares)	1,676
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 25.08
Outstanding Weighted Average Contractual Life (in years)	4 years 4 months
Outstanding Aggregated Intrinsic Value (in dollars)	$ 71,196
Number Exercisable (in shares)	1,446
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 21.05
Exercisable Weighted Average Contractual Life (in years)	3 years 7 months 7 days
Exercisable Aggregate Intrinsic Value (in dollars)	$ 67,257
Common Class A [Member]
Number Outstanding (in shares)	1,662
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 30.52
Outstanding Weighted Average Contractual Life (in years)	6 years
Outstanding Aggregated Intrinsic Value (in dollars)	$ 49,002
Number Exercisable (in shares)	916
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 23.37
Exercisable Weighted Average Contractual Life (in years)	4 years 9 months 18 days
Exercisable Aggregate Intrinsic Value (in dollars)	$ 33,553