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SHARE-BASED COMPENSATION, Options Outstanding and Exercisable (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2022
Oct. 31, 2021
Stock Options Outstanding [Abstract]        
Number Outstanding (in shares) 3,435 4,054 3,629 4,341
Outstanding Weighted Average Exercise Price (in dollars per share) $ 96.14 $ 83.74 $ 59.44 $ 52.16
Outstanding Weighted Average Contractual Life (in years) 5 years 6 months      
Outstanding Aggregated Intrinsic Value (in dollars) $ 401,816      
Stock Options Exercisable [Abstract]        
Number Exercisable (in shares) 2,286      
Exercisable Weighted Average Exercise Price (in dollars per share) $ 74.05      
Exercisable Weighted Average Contractual Life (in years) 4 years 2 months 12 days      
Exercisable Aggregate Intrinsic Value (in dollars) $ 320,584      
Heico Common Stock [Member]        
Stock Options Outstanding [Abstract]        
Number Outstanding (in shares) 1,369      
Outstanding Weighted Average Exercise Price (in dollars per share) $ 100.21      
Outstanding Weighted Average Contractual Life (in years) 5 years 2 months 12 days      
Outstanding Aggregated Intrinsic Value (in dollars) $ 198,153      
Stock Options Exercisable [Abstract]        
Number Exercisable (in shares) 963      
Exercisable Weighted Average Exercise Price (in dollars per share) $ 76.58      
Exercisable Weighted Average Contractual Life (in years) 3 years 10 months 24 days      
Exercisable Aggregate Intrinsic Value (in dollars) $ 162,143      
Common Class A [Member]        
Stock Options Outstanding [Abstract]        
Number Outstanding (in shares) 2,066      
Outstanding Weighted Average Exercise Price (in dollars per share) $ 93.44      
Outstanding Weighted Average Contractual Life (in years) 5 years 8 months 12 days      
Outstanding Aggregated Intrinsic Value (in dollars) $ 203,663      
Stock Options Exercisable [Abstract]        
Number Exercisable (in shares) 1,323      
Exercisable Weighted Average Exercise Price (in dollars per share) $ 72.21      
Exercisable Weighted Average Contractual Life (in years) 4 years 3 months 18 days      
Exercisable Aggregate Intrinsic Value (in dollars) $ 158,441