DOCUMENT AND ENTITY INFORMATION - $ / shares	3 Months Ended
	Jan. 31, 2024	Feb. 27, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity Shell Company	false
Local Phone Number	987-4000
Entity File Number	001-04604
City Area Code	954
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Period End Date	Jan. 31, 2024
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2024
Entity Current Reporting Status	Yes
Entity Information [Line Items]
Entity Incorporation, State or Country Code	FL
Entity Registrant Name	HEICO CORPORATION
Address	3000 Taft Street
Entity Address, City or Town	Hollywood
State	FL
Zip Code	33021
Entity Central Index Key	0000046619
Entity Tax Identification Number	65-0341002
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]
Title of 12(b) Security	Common Stock, $.01 par value per share
Security Exchange Name	NYSE
Trading Symbol	HEI
Entity Common Stock, Shares Outstanding		54,772,494
Entity Common Stock Par Value	$ 0.01
Common Class A [Member]
Entity Information [Line Items]
Title of 12(b) Security	Class A Common Stock, $.01 par value per share
Security Exchange Name	NYSE
Trading Symbol	HEI.A
Entity Common Stock, Shares Outstanding		83,591,871
Entity Common Stock Par Value	$ 0.01