ACQUISITIONS (Details Textuals) - USD ($) $ in Thousands		12 Months Ended
	Aug. 04, 2023	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2023	Jan. 05, 2023
Business Combination [Line Items]
Acquisition Costs				$ 25,400
Net sales		$ 4,485,044	$ 3,857,669	2,968,105
Net income		$ 690,385	$ 514,109	403,596
ELT
Business Combination [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.
Wencor
Business Combination [Line Items]
Effective Date of Acquisition		Aug. 04, 2023
Name of Acquired Entity		Wencor Group
Description of Acquired Entity		Wencor is a large commercial and military aircraft aftermarket company offering factory-new FAA-approved aircraft replacement parts, value-added distribution of high-use commercial and military aftermarket parts, and aircraft and engine accessory component repair and overhaul services.
Business Combination, Reason for Business Combination		Wencor expands the Company’s aftermarket product offerings, enabling the combined company to offer even greater savings and capabilities to its customers, while expanding its new products and services development capacity.
Amount of contingent purchase consideration, the company could be required to pay	$ 17,000
Business Combination, Recognized Liability Assumed, Liability		$ 205,146
Cash paid	1,900,000	$ 1,923,098
Acquisition Costs				20,000
Net sales				185,700
Net income				22,600
Pro Forma Revenue				3,476,300
Debt Related Commitment Fees and Debt Issuance Costs	$ 3,800
Pro Forma Revenue				3,476,300
Wencor | Common Class A [Member]
Business Combination [Line Items]
Stock Issued During Period, Shares, Acquisitions	1,137,628
Wencor | Customer Relationships [Member]
Business Combination [Line Items]
Finite-Lived Intangible Asset, Useful Life		13 years
Wencor | Intellectual Property [Member]
Business Combination [Line Items]
Finite-Lived Intangible Asset, Useful Life		14 years
Exxelia
Business Combination [Line Items]
Effective Date of Acquisition		Jan. 05, 2023
Business Combination, Recognized Liability Assumed, Liability		$ 100,323
Cash paid		$ 515,785
Net sales				179,000
Preferred Stock, Dividend Rate, Percentage		5.18%
Exxelia | Customer Relationships [Member]
Business Combination [Line Items]
Finite-Lived Intangible Asset, Useful Life		15 years
Exxelia | Intellectual Property [Member]
Business Combination [Line Items]
Finite-Lived Intangible Asset, Useful Life		15 years
ELT
Business Combination [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.
HEICO Electronic [Member] | Exxelia
Business Combination [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 Combination, Voting Equity Interest Acquired, Percentage					93.69%
Acquisition Costs				5,500
Business Acquisition, Acquisition Costs				$ 5,100
HEICO Electronic [Member] | Exxelia | Existing Management [Member]
Business Combination [Line Items]
Percentage of interest owned by noncontrolling shareholders					6.31%
HEICO Electronic [Member] | Alcon
Business Combination [Line Items]
Name of Acquired Entity		Alcon Electronics Pvt. Ltd.
Business Combination, Voting Equity Interest Acquired, Percentage					90.00%
HEICO Electronic [Member] | Alcon | Existing Management [Member]
Business Combination [Line Items]
Percentage of interest owned by noncontrolling shareholders					10.00%
HEICO Electronic [Member] | MC2
Business Combination [Line Items]
Name of Acquired Entity		Mid Continent Controls, Inc.
Description of Acquired Entity		MC2 designs and manufactures proprietary in-cabin power and entertainment components and subsystems for business jets.
Business Combination, Voting Equity Interest Acquired, Percentage		87.90%
HEICO Electronic [Member] | MC2 | Existing Management [Member]
Business Combination [Line Items]
Percentage of interest owned by noncontrolling shareholders		12.10%
HEICO Electronic [Member] | MPS
Business Combination [Line Items]
Name of Acquired Entity		Marway Power Solutions, Inc.
Description of Acquired Entity		Marway designs and manufactures power distribution solutions for mission-critical systems deployed in defense, aerospace, communications, test & measurement, and industrial applications on land, air, and sea.
Business Combination, Voting Equity Interest Acquired, Percentage		92.50%
HEICO Electronic [Member] | MPS | Existing Management [Member]
Business Combination [Line Items]
Percentage of interest owned by noncontrolling shareholders		7.50%
HEICO Electronic [Member] | Gables
Business Combination [Line Items]
Name of Acquired Entity		Gables Engineering, Inc.
Description of Acquired Entity		Gables designs and manufactures advanced solutions for aerospace platforms, including cockpit displays and other avionics components such as navigation, audio, surveillance, and communication panels for a wide range of aircraft.
Business Combination, Voting Equity Interest Acquired, Percentage		100.00%
HEICO Electronic [Member] | Rosen
Business Combination [Line Items]
Name of Acquired Entity		Rosen Aviation, LLC
Description of Acquired Entity		Rosen designs and manufactures in-flight entertainment products, principally in-cabin displays and control panels, for the business and aviation markets.
Business Combination, Voting Equity Interest Acquired, Percentage		100.00%
HEICO Electronic [Member] | SVM
Business Combination [Line Items]
Name of Acquired Entity		SVM Private Limited
Description of Acquired Entity		SVM designs and manufactures high-performance electronic passive components and subsystems, including critical magnetic components and busbars, that serve the healthcare and industrial end-markets.
Business Combination, Voting Equity Interest Acquired, Percentage		70.00%
HEICO Electronic [Member] | SVM | Existing Management [Member]
Business Combination [Line Items]
Percentage of interest owned by noncontrolling shareholders		30.00%
HFSC | Capewell
Business Combination [Line Items]
Name of Acquired Entity		Aerial Delivery and Descent Devices divisions of Capewell Aerial Systems
Description of Acquired Entity		Capewell designs, manufactures and distributes emergency descent devices ("EDDs"), personnel and cargo parachute products, heavy airdrop platforms, and other highly-engineered products.
HFSC | Millennium
Business Combination [Line Items]
Name of Acquired Entity		Millennium International, LLC
Description of Acquired Entity		Millennium is an FAA and EASA-certified Part 145 Repair Station, specializing in the repair and support of new generation and legacy avionics systems and components. Millennium offers comprehensive repair, overhaul, retrofit, and exchange services to its customers that include aircraft OEMs, fleet operators, repair businesses, and avionics brokers.
Business Combination, Voting Equity Interest Acquired, Percentage		90.00%
Amount of contingent purchase consideration, the company could be required to pay		$ 11,500
Stock Issued During Period, Shares, Acquisitions		53,186
HFSC | Millennium | Existing Management [Member]
Business Combination [Line Items]
Percentage of interest owned by noncontrolling shareholders		10.00%