| DOCUMENT INFORMATION | May 25, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | May 25, 2021 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Amendment Flag | false |
| ENTITY INFORMATION | May 25, 2021 |
| Entity Information [Line Items] | |
| Entity Registrant Name | HEICO CORPORATION |
| Entity Incorporation, State or Country Code | FL |
| Entity File Number | 001-04604 |
| Entity Tax Identification Number | 65-0341002 |
| Entity Address, Address Line One | 3000 Taft Street |
| Entity Address, City or Town | Hollywood |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33021 |
| City Area Code | 954 |
| Local Phone Number | 987-4000 |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000046619 |
| Heico Common Stock [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common Stock, $.01 par value per share |
| Trading Symbol | HEI |
| Security Exchange Name | NYSE |
| Common Class A [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Class A Common Stock, $.01 par value per share |
| Trading Symbol | HEI.A |
| Security Exchange Name | NYSE |
