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REDEEMABLE NONCONTROLLING INTERESTS (Details Textuals) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Apr. 30, 2023
Oct. 31, 2023
Oct. 31, 2022
Oct. 31, 2021
May 31, 2022
May 31, 2021
Jun. 30, 2020
May 31, 2020
Temporary Equity Disclosure [Abstract]                
Aggregate Redemption Amount Puttable   $ 152.9            
Potential Redemption Amount Payable   92.4            
Business Acquisition [Line Items]                
Acquisitions of noncontrolling interests   $ (2.7) $ (8.7) $ (2.3)        
FY 2015 Acquisition [Member] | Flight Support Group [Member] | Flight Support Group [Member]                
Business Acquisition [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   19.90%            
Noncontrolling Interest, Ownership Percentage by Parent   85.10%            
FY 2017 Acquisition [Member] | Flight Support Group [Member]                
Business Acquisition [Line Items]                
Business Acquisition, Percentage of Voting Interests Acquired         9.95%      
FY 2017 Acquisition [Member] | Flight Support Group [Member] | Flight Support Group [Member]                
Business Acquisition [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners         19.90%      
Noncontrolling Interest, Ownership Percentage by Parent   90.05%            
FY2015 Acquisition 2 | Flight Support Group [Member]                
Business Acquisition [Line Items]                
Percentage of Voting Interests Sold   3.00%            
FY2015 Acquisition 2 | Flight Support Group [Member] | Flight Support Group [Member]                
Business Acquisition [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners               20.00%
Noncontrolling Interest, Ownership Percentage by Parent   82.00%            
FY2018 Acquisition 1 | Flight Support Group [Member]                
Business Acquisition [Line Items]                
Percentage of Voting Interests Sold   10.00%            
FY2018 Acquisition 1 | Flight Support Group [Member] | Flight Support Group [Member]                
Business Acquisition [Line Items]                
Noncontrolling Interest, Ownership Percentage by Parent   90.00%            
FY2008 Acquisition [Member] | Flight Support Group [Member] | Flight Support Group [Member]                
Business Acquisition [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners       17.70%        
Noncontrolling Interest, Ownership Percentage by Parent           90.00% 86.20%  
Exxelia | HEICO Electronic [Member]                
Business Acquisition [Line Items]                
Business Acquisition, Percentage of Voting Interests Acquired   93.69%            
Exxelia | Existing Management [Member] | HEICO Electronic [Member]                
Business Acquisition [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   6.31%            
Percent of ownership sold during the period 2.72%              
Exxelia | Exxelia | HEICO Electronic [Member]                
Business Acquisition [Line Items]                
Noncontrolling Interest, Ownership Percentage by Parent   90.97%            
Alcon | HEICO Electronic [Member]                
Business Acquisition [Line Items]                
Business Acquisition, Percentage of Voting Interests Acquired   90.00%            
Alcon | Existing Management [Member] | HEICO Electronic [Member]                
Business Acquisition [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   10.00%