ACQUISITIONS (Details Textuals) € in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Jan. 31, 2023 USD ($)	Jan. 31, 2023 EUR (€)	Oct. 31, 2022 USD ($) shares	Oct. 31, 2021 USD ($)	Jan. 31, 2023 EUR (€)
Business Acquisition [Line Items]
Pro Forma Revenue			$ 2,325,200	$ 2,043,464
HEICO Electronic [Member] | TRAD
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
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.
HEICO Electronic [Member] | Ironwood
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			80.36%
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.
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]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Name of Acquired Entity			Sensor Systems, Inc.
Description of Acquired Entity			Sensor designs and manufactures airborne antennas for commercial and military applications.
Stock Issued During Period, Shares, Acquisitions | shares			576,338
HEICO Electronic [Member] | Charter
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
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.
HEICO Electronic [Member] | Flight Microwave
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
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.
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]
Business Acquisition, Percentage of Voting Interests Acquired			80.10%
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.
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.
HEICO Electronic [Member] | Connect Tech [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			89.99%
Name of Acquired Entity			Connect Tech Inc.
Description of Acquired Entity			Connect Tech designs and manufacturers rugged, small-form-factor embedded computing solutions. Connect Tech's components are designed for very harsh environments and are primarily used in rugged commercial and industrial, aerospace and defense, transportation, and smart energy applications.
Amount of contingent purchase consideration, the company could be required to pay			$ 9,700
HEICO Electronic [Member] | Connect Tech [Member] | Existing Management [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			10.01%
HEICO Electronic [Member] | TSID [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			75.00%
Name of Acquired Entity			Transformational Security, LLC and Intelligent Devices, Inc. (collectively, "TSID")
Description of Acquired Entity			TSID develops and manufactures state-of-the-art Technical Surveillance Countermeasures ("TSCM") equipment used to protect critical spaces from exploitation via wireless transmissions, technical surveillance and listening devices.
Amount of contingent purchase consideration, the company could be required to pay			$ 14,000
HEICO Electronic [Member] | TSID [Member] | Existing Management [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			25.00%
HEICO Electronic [Member] | Transformational Security [Member]
Business Acquisition [Line Items]
Name of Acquired Entity			Transformational Security, LLC
HEICO Electronic [Member] | Intelligent Devices [Member]
Business Acquisition [Line Items]
Name of Acquired Entity			Intelligent Devices, Inc.
HEICO Electronic [Member] | Freebird [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Name of Acquired Entity			Freebird Semiconductor Corporation
HEICO Electronic [Member] | EPC [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			49.00%
Name of Acquired Entity			EPC Space LLC
Description of Acquired Entity			EPC designs, develops, promotes, markets and sells radiation-hardened gallium nitride power solutions packaged for use in outer space and other high reliability applications.
HEICO Electronic [Member] | HMI [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Name of Acquired Entity			Human-Machine Interface
Description of Acquired Entity			HMI designs, manufactures, and repairs flight deck annunciators, panels, indicators, and illuminated keyboards, as well as lighting controls, and flight deck lighting.
HEICO Electronic [Member] | Quell [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			80.10%
Name of Acquired Entity			Quell Corporation
Description of Acquired Entity			Quell designs and manufactures electromagnetic interference (EMI)/radio-frequency interference (RFI) and transient protection solutions for a wide variety of connectors that principally serve customers within the aerospace and defense markets.
HEICO Electronic [Member] | Quell [Member] | Existing Management [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			19.90%
HEICO Electronic [Member] | Exxelia
Business Acquisition [Line Items]
Name of Acquired Entity			Exxelia International
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.
HEICO Electronic [Member] | Exxelia | Forecast | Subsequent Event [Member]
Business Acquisition [Line Items]
Business Combination, Price of Acquisition, Expected	$ 449,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	$ 14,000
HEICO Electronic [Member] | Exxelia | Forecast | Subsequent Event [Member] | Euro Member Countries, Euro
Business Acquisition [Line Items]
Business Combination, Price of Acquisition, Expected | €		€ 453,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | €					€ 14,000
HEICO Electronic [Member] | Exxelia | Existing Management [Member] | Forecast | Subsequent Event [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders	5.00%				5.00%
HFSC | Subsidiary Five [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			84.00%
HFSC | Accurate
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			96.00%
Name of Acquired Entity			Accurate Metal Machining, Inc.
Description of Acquired Entity			Accurate is a manufacturer of high-reliability components and assemblies.
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]
Business Acquisition, Percentage of Voting Interests Acquired			74.00%
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.
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]
Business Acquisition, Percentage of Voting Interests Acquired			89.00%
Name of Acquired Entity			Ridge HoldCo, LLC
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]
Business Acquisition, Percentage of Voting Interests Acquired			80.10%
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.
HFSC | Camtronics [Member] | Existing Management [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			10.00%
HFSC | Camtronics [Member] | Subsidiary Five [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			9.90%
HFSC | Rocky Mountain [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			70.00%
Name of Acquired Entity			Rocky Mountain Hydrostatics, LLC
Description of Acquired Entity			Rocky Mountain overhauls industrial pumps, motors, and other hydraulic units with a focus on the support of legacy systems for the U.S. Navy.
HFSC | Rocky Mountain [Member] | Existing Management [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders			30.00%