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FAIR VALUE MEASUREMENTS (Details Textuals)
$ in Thousands, $ in Thousands
Oct. 31, 2020
USD ($)
Oct. 31, 2020
CAD ($)
Oct. 31, 2019
USD ($)
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration, liability $ 41,974   $ 18,326
FY2019 Acquisition [Member] | Heico Flight Support Corp [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Amount of contingent purchase consideration, the company could be required to pay 6,400    
Contingent consideration, liability     $ 1,100
FY 2017 Acquisition [Member] | HEICO Electronic [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Amount of contingent purchase consideration, the company could be required to pay 20,000    
Contingent consideration, liability $ 18,100    
FY2020 Acquisition Subsidiary 1 [Member] | HEICO Electronic [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired 89.99% 89.99%  
Contingent consideration, liability $ 9,700    
FY2020 Acquisition Subsidiary 2 [Member] | HEICO Electronic [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired 75.00% 75.00%  
Amount of contingent purchase consideration, the company could be required to pay $ 35,000    
Contingent consideration, liability $ 14,200    
Canada, Dollars | FY2020 Acquisition Subsidiary 1 [Member] | HEICO Electronic [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Amount of contingent purchase consideration, the company could be required to pay   $ 27,000  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low   13,500  
Contingent consideration, liability   $ 12,900