ACQUISITIONS (Details Textuals) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Aug. 04, 2023	Apr. 30, 2023	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2021
Business Acquisition [Line Items]
Acquisition Costs			$ 25,400
Net sales			2,968,105	$ 2,208,322	$ 1,865,682
Net income			$ 403,596	351,675	304,220
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.
Wencor
Business Acquisition [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 & military aftermarket parts, and aircraft & 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 Identifiable Assets Acquired and Liabilities Assumed, Liabilities			203,251
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	2,682,328
Debt Related Commitment Fees and Debt Issuance Costs			3,800
Pro Forma Revenue			$ 3,476,300	2,682,328
Wencor | Common Class A [Member]
Business Acquisition [Line Items]
Stock Issued During Period, Shares, Acquisitions	1,137,628
Wencor | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life			13 years
Wencor | Intellectual Property [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life			14 years
Exxelia
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			$ 100,771
Cash paid			515,785
Net sales			$ 179,000
Preferred Stock, Dividend Rate, Percentage			5.18%
Pro Forma Revenue				2,402,500
Pro Forma Revenue				2,402,500
Exxelia | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life			15 years
Exxelia | Intellectual Property [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life			15 years
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.
FY2022 Acquisitions
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				39,965
Cash paid				348,606
Pro Forma Revenue				2,325,200	2,043,464
Pro Forma Revenue				$ 2,325,200	$ 2,043,464
FY2022 Acquisitions | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				15 years
FY2022 Acquisitions | Intellectual Property [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				13 years
HEICO Electronic [Member] | 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%
Acquisition Costs			$ 5,500
Business Acquisition, Acquisition Costs			$ 5,100
HEICO Electronic [Member] | Exxelia | Existing Management [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			6.31%
Percent of ownership sold during the period		2.72%
HEICO Electronic [Member] | Exxelia | Exxelia
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			90.97%
HEICO Electronic [Member] | Alcon
Business Acquisition [Line Items]
Name of Acquired Entity			Alcon Electronics Pvt. Ltd.
Business Acquisition, Percentage of Voting Interests Acquired			90.00%
HEICO Electronic [Member] | Alcon | Existing Management [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			10.00%
HEICO Electronic [Member] | TRAD
Business Acquisition [Line Items]
Name of Acquired Entity			TRAD Tests & Radiations SAS
Description of Acquired Entity			TRAD specializes in radiation engineering, including test and simulation of radiation effects on electronic components and materials, developing and providing software for radiation testing and effects modeling, and sourcing/screening radiation tolerant and radiation hardened components.
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
HEICO Electronic [Member] | Ironwood
Business Acquisition [Line Items]
Name of Acquired Entity			Ironwood Electronics, Inc.
Description of Acquired Entity			Ironwood designs and manufactures high performance test sockets and adapters for both engineering and production use of semiconductor devices.
Business Acquisition, Percentage of Voting Interests Acquired			80.36%
Amount of contingent purchase consideration, the company could be required to pay			$ 6,400
HEICO Electronic [Member] | Ironwood | Existing Management [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			19.64%
HEICO Electronic [Member] | Sensor
Business Acquisition [Line Items]
Name of Acquired Entity			Sensor Systems, Inc.
Description of Acquired Entity			Sensor designs and manufactures airborne antennas for commercial and military applications.
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Stock Issued During Period, Shares, Acquisitions			576,338
HEICO Electronic [Member] | Charter
Business Acquisition [Line Items]
Name of Acquired Entity			Charter Engineering, Inc.
Description of Acquired Entity			Charter designs and manufactures a complete line of RF and Microwave coaxial switches for the aerospace, defense, commercial, Automated Test Equipment ("ATE"), and instrumentation markets.
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
HEICO Electronic [Member] | Flight Microwave
Business Acquisition [Line Items]
Name of Acquired Entity			Flight Microwave Corporation
Description of Acquired Entity			Flight Microwave is a designer and manufacturer of custom high power filters and filter assemblies used in space and defense applications.
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
HEICO Electronic [Member] | Paciwave [Member]
Business Acquisition [Line Items]
Name of Acquired Entity			Paciwave, Inc.
Description of Acquired Entity			Paciwave is a designer and manufacturer of Radio Frequency (RF) and microwave components and integrated assemblies specializing particularly in PIN Diode Switches, PIN Attenuators, PIN Limiters, Switching Assemblies and integrated subsystems found in defense and other complex electronic applications.
HEICO Electronic [Member] | RH Labs [Member]
Business Acquisition [Line Items]
Name of Acquired Entity			R.H. Laboratories, Inc.
Description of Acquired Entity			RH Labs designs and manufactures state-of-the-art RF and microwave integrated assemblies, sub-assemblies and components used in a broad range of demanding defense applications operating in harsh environments including Space.
Business Acquisition, Percentage of Voting Interests Acquired			80.10%
HEICO Electronic [Member] | RH Labs [Member] | Existing Management [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			19.90%
HEICO Electronic [Member] | Pyramid [Member]
Business Acquisition [Line Items]
Name of Acquired Entity			Pyramid Semiconductor LLC
Description of Acquired Entity			Pyramid is a specialty semiconductor designer and manufacturer offering a well-developed line of processors, static random-access memory (SRAM), electronically erasable programmable read-only memory (EEPROM) and Logic products on a diverse array of military, space and medical platforms.
HFSC | HFSC Subsidiary
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			84.00%
HFSC | Accurate
Business Acquisition [Line Items]
Name of Acquired Entity			Accurate Metal Machining, Inc.
Description of Acquired Entity			Accurate is a manufacturer of high-reliability components and assemblies.
Business Acquisition, Percentage of Voting Interests Acquired			96.00%
Amount of contingent purchase consideration, the company could be required to pay			$ 13,100
HFSC | Accurate | Existing Management [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			4.00%
HFSC | Pioneer
Business Acquisition [Line Items]
Name of Acquired Entity			Pioneer Industries, LLC
Description of Acquired Entity			Pioneer is a specialty distributor of spares for military aviation, marine, and ground platforms.
Business Acquisition, Percentage of Voting Interests Acquired			74.00%
Amount of contingent purchase consideration, the company could be required to pay			$ 9,800
HFSC | Pioneer | Existing Management [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			26.00%
HFSC | Ridge Holdco [Member]
Business Acquisition [Line Items]
Name of Acquired Entity			Ridge HoldCo, LLC
Business Acquisition, Percentage of Voting Interests Acquired			89.00%
Amount of contingent purchase consideration, the company could be required to pay			$ 18,300
HFSC | Ridge Holdco [Member] | Existing Management [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			11.00%
HFSC | Ridge Engineering [Member] | Ridge Holdco [Member]
Business Acquisition [Line Items]
Name of Acquired Entity			Ridge Engineering, Inc.
Description of Acquired Entity			Ridge performs tight-tolerance machining and brazing of large-sized parts in mission-critical defense and aerospace applications.
HFSC | Bechdon [Member] | Ridge Holdco [Member]
Business Acquisition [Line Items]
Name of Acquired Entity			The Bechdon Company, Inc.
Description of Acquired Entity			Bechdon provides machining, fabrication and welding services for aerospace, defense and other industrial applications.
HFSC | Camtronics [Member]
Business Acquisition [Line Items]
Name of Acquired Entity			Camtronics, LLC
Description of Acquired Entity			Camtronics is a Federal Aviation Administration ("FAA")-certified Part 145 repair station with extensive proprietary FAA-designated engineering representative repairs for a variety of domestic and international commercial and cargo airlines.
Business Acquisition, Percentage of Voting Interests Acquired			80.10%
HFSC | Camtronics [Member] | Existing Management [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			10.00%
HFSC | Camtronics [Member] | Non-controlling Interest Holders
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			9.90%