ACQUISITIONS (Details Textuals) $ in Thousands, € in Millions	3 Months Ended			9 Months Ended
	Jul. 31, 2023 USD ($)	Apr. 30, 2023	Jul. 31, 2022 USD ($)	Jul. 31, 2023 USD ($)	Jul. 31, 2022 USD ($)	Jul. 31, 2023 EUR (€)
Business Acquisition [Line Items]
Revenues	$ 722,902		$ 569,528	$ 2,031,658	$ 1,598,684
ELT
Business Acquisition [Line Items]
Name Of Acquired Product Line				Aircraft Emergency Locator Transmitter
Description of Acquired Product Line				ELTs provide critical emergency transmission signals in the event of aircraft impact on land or water to enable first responders to locate the aircraft.
ELT
Business Acquisition [Line Items]
Business Combination, Reason for Business Combination				The transaction provides the HEICO Electronic subsidiary with all rights to produce, sell and repair both fixed and portable Honeywell ELTs, as well as various support equipment.
Exxelia
Business Acquisition [Line Items]
Preferred Stock, Dividend Rate, Percentage				5.18%
Revenues	$ 58,400			$ 128,000
Exxelia | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years			15 years		15 years
Exxelia | Intellectual Property [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years			15 years		15 years
Exxelia | Related Party
Related Party Transaction [Line Items]
Related Party Transaction, Terms and Manner of Settlement				HEICO issued Exxelia a ten-year, €150 million note, which accrues interest at 4.7% per annum on the principal outstanding.
Loans and Leases Receivable, Related Parties | €						€ 150
Related Party Transaction, Rate				4.70%
Heico Electronic Technologies Corp | Exxelia
Business Acquisition [Line Items]
Name of Acquired Entity				Exxelia International SAS
Description of Acquired Entity				Exxelia designs, manufactures and sells high reliability (“Hi-Rel”), complex, passive electronic components and rotary joint assemblies for mostly aerospace and defense applications, in addition to other high-end applications, such as medical and energy uses, including emerging “clean energy” and electrification applications.
Business Combination, Reason for Business Combination				The Company believes that this acquisition will further HEICO's strategy of expanding its already wide range of mission-critical and Hi-Rel components for the most demanding applications, as well as provide HEICO with added broad geographic and product diversity, including in the important European market.
Business Acquisition, Percentage of Voting Interests Acquired	93.69%			93.69%		93.69%
Business Acquisition, Transaction Costs	$ 5,100			$ 5,100
Heico Electronic Technologies Corp | Exxelia | Existing Management
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	6.31%			6.31%		6.31%
Percent of ownership sold during the period		2.72%
Heico Electronic Technologies Corp | Exxelia | Exxelia
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	90.97%			90.97%		90.97%
Heico Electronic Technologies Corp | Alcon
Business Acquisition [Line Items]
Name of Acquired Entity				Alcon Electronics Pvt. Ltd.
Business Acquisition, Percentage of Voting Interests Acquired	90.00%			90.00%		90.00%
Heico Electronic Technologies Corp | Alcon | Existing Management
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	10.00%			10.00%		10.00%