SHARE-BASED COMPENSATION, Options Outstanding and Exercisable (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Stock Options Outstanding [Abstract]
Number Outstanding (in shares)	3,629	4,341	3,993	4,692
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 59.44	$ 52.16	$ 36.75	$ 33.73
Outstanding Weighted Average Contractual Life (in years)	5 years 1 month 6 days
Outstanding Aggregated Intrinsic Value (in dollars)	$ 300,932
Stock Options Exercisable [Abstract]
Number Exercisable (in shares)	2,709
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 43.06
Exercisable Weighted Average Contractual Life (in years)	4 years 1 month 6 days
Exercisable Aggregate Intrinsic Value (in dollars)	$ 272,480
Heico Common Stock [Member]
Stock Options Outstanding [Abstract]
Number Outstanding (in shares)	1,546
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 55.51
Outstanding Weighted Average Contractual Life (in years)	4 years 6 months
Outstanding Aggregated Intrinsic Value (in dollars)	$ 165,640
Stock Options Exercisable [Abstract]
Number Exercisable (in shares)	1,252
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 40.86
Exercisable Weighted Average Contractual Life (in years)	3 years 8 months 12 days
Exercisable Aggregate Intrinsic Value (in dollars)	$ 152,481
Common Class A [Member]
Stock Options Outstanding [Abstract]
Number Outstanding (in shares)	2,083
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 62.36
Outstanding Weighted Average Contractual Life (in years)	5 years 6 months
Outstanding Aggregated Intrinsic Value (in dollars)	$ 135,292
Stock Options Exercisable [Abstract]
Number Exercisable (in shares)	1,457
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 44.95
Exercisable Weighted Average Contractual Life (in years)	4 years 4 months 24 days
Exercisable Aggregate Intrinsic Value (in dollars)	$ 119,999