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ACQUISITIONS (Details Textuals) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 04, 2023
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2022
Oct. 31, 2021
Jan. 31, 2023
Jan. 05, 2023
Business Acquisition [Line Items]              
Acquisition Costs     $ 25,400        
Net sales   $ 3,857,669 2,968,105 $ 2,208,322      
Net income   $ 514,109 403,596 351,675      
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 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 Identifiable Assets Acquired and Liabilities Assumed, Liabilities   $ 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 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]              
Effective Date of Acquisition   Jan. 05, 2023          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   $ 100,323          
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]              
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life       14 years      
Pro Forma Revenue         $ 2,325,200    
Pro Forma Revenue         $ 2,325,200    
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]              
Noncontrolling Interest, Ownership Percentage by Parent   90.69%          
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% 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%
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] | MC2              
Business Acquisition [Line Items]              
Name of Acquired Entity   Mid Continent Controls, Inc.          
Description of Acquired Entity   MC2 designs and manufacturers proprietary in-cabin power and entertainment components and subsystems for business jets.          
Business Acquisition, Percentage of Voting Interests Acquired   87.90%          
HEICO Electronic [Member] | MC2 | Existing Management [Member]              
Business Acquisition [Line Items]              
Percentage of interest owned by noncontrolling shareholders   12.10%          
HEICO Electronic [Member] | MPS              
Business Acquisition [Line Items]              
Name of Acquired Entity   Marway Power Solutions, Inc.          
Description of Acquired Entity   Marway designs and manufacturers power distribution solutions for mission-critical systems deployed in defense, aerospace, communications, test & measurement, and industrial applications on land, air, and sea.          
Business Acquisition, Percentage of Voting Interests Acquired   92.50%          
HEICO Electronic [Member] | MPS | Existing Management [Member]              
Business Acquisition [Line Items]              
Percentage of interest owned by noncontrolling shareholders   7.50%          
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%          
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 | Capewell              
Business Acquisition [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 | 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%