v3.10.0.1
DOCUMENT AND ENTITY INFORMATION - $ / shares
3 Months Ended
Jan. 31, 2019
Feb. 26, 2019
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jan. 31, 2019  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2019  
Entity Current Reporting Status Yes  
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  
Entity Small Business false  
Entity Emerging Growth Company false  
Heico Common Stock [Member]    
Entity Information [Line Items]    
Trading Symbol hei  
Entity Common Stock, Shares Outstanding   53,362,618
Entity Common Stock Par Value $ 0.01  
Common Class A [Member]    
Entity Information [Line Items]    
Trading Symbol hei.a  
Entity Common Stock, Shares Outstanding   79,604,916
Entity Common Stock Par Value $ 0.01