DOCUMENT AND ENTITY INFORMATION - $ / shares	6 Months Ended
	Apr. 30, 2019	May 28, 2019
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Apr. 30, 2019
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2019
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
Entity Current Reporting Status	Yes
Heico Common Stock [Member]
Entity Information [Line Items]
Trading Symbol	HEI
Entity Common Stock, Shares Outstanding		53,806,849
Entity Common Stock Par Value	$ 0.01
Common Class A [Member]
Entity Information [Line Items]
Trading Symbol	HEI.A
Entity Common Stock, Shares Outstanding		80,033,627
Entity Common Stock Par Value	$ 0.01