SHARE-BASED COMPENSATION, Assumptions for Option Grants Fair Value Calculation (Details) - $ / shares	12 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2023
Common Class A [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected stock price volatility	31.66%	32.65%	33.59%
Risk-free interest rate	4.13%	4.20%	3.64%
Dividend yield	0.12%	0.16%	0.17%
Forfeiture rate	0.00%	0.00%	0.00%
Expected option life (years)	6 years	6 years	6 years
Weighted average fair value	$ 77.79	$ 63.15	$ 50.90
Heico Common Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected stock price volatility	30.27%		31.48%
Risk-free interest rate	4.22%		3.63%
Dividend yield	0.09%		0.15%
Forfeiture rate	0.00%		0.00%
Expected option life (years)	9 years		8 years
Weighted average fair value	$ 124.86		$ 69.57