v3.10.0.1
DOCUMENT AND ENTITY INFORMATION - $ / shares
9 Months Ended
Jul. 31, 2018
Aug. 29, 2018
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jul. 31, 2018  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2018  
Entity Information [Line Items]    
Entity Registrant Name HEICO CORPORATION  
Address 3000 Taft Street, Hollywood, Florida  
State Florida  
Zip Code 33021  
Entity Central Index Key 0000046619  
Entity Tax Identification Number 650341002  
Current Fiscal Year End Date --10-31  
Entity Filer Category Large Accelerated Filer  
Trading Symbol hei  
Heico Common Stock [Member]    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   53,349,968
Entity Common Stock Par Value $ 0.01  
Common Class A [Member]    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   79,542,004
Entity Common Stock Par Value $ 0.01