SHARE-BASED COMPENSATION, Options Outstanding and Exercisable (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2020
Stock Options Outstanding [Abstract]
Number Outstanding (in shares)	4,054	3,629	4,341	3,993
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 83.74	$ 59.44	$ 52.16	$ 36.75
Outstanding Weighted Average Contractual Life (in years)	5 years 8 months 12 days
Outstanding Aggregated Intrinsic Value (in dollars)	$ 233,463
Stock Options Exercisable [Abstract]
Number Exercisable (in shares)	2,511
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 53.00
Exercisable Weighted Average Contractual Life (in years)	3 years 10 months 24 days
Exercisable Aggregate Intrinsic Value (in dollars)	$ 221,276
Heico Common Stock [Member]
Stock Options Outstanding [Abstract]
Number Outstanding (in shares)	1,676
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 84.81
Outstanding Weighted Average Contractual Life (in years)	5 years 3 months 18 days
Outstanding Aggregated Intrinsic Value (in dollars)	$ 125,273
Stock Options Exercisable [Abstract]
Number Exercisable (in shares)	1,123
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 51.27
Exercisable Weighted Average Contractual Life (in years)	3 years 6 months
Exercisable Aggregate Intrinsic Value (in dollars)	$ 120,299
Common Class A [Member]
Stock Options Outstanding [Abstract]
Number Outstanding (in shares)	2,378
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 82.99
Outstanding Weighted Average Contractual Life (in years)	6 years
Outstanding Aggregated Intrinsic Value (in dollars)	$ 108,190
Stock Options Exercisable [Abstract]
Number Exercisable (in shares)	1,388
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 54.40
Exercisable Weighted Average Contractual Life (in years)	4 years 2 months 12 days
Exercisable Aggregate Intrinsic Value (in dollars)	$ 100,977