ACQUISITIONS (Details Textuals) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Oct. 31, 2015
Business Acquisition [Line Items]
Contingent consideration	$ 18,777		$ 18,777		$ 21,405
Revenue, Net	356,084	$ 300,370	1,012,959	$ 859,976
Net income attributable to HEICO	42,002	$ 34,369	$ 111,930	$ 95,114
Electronic Technologies Group [Member] | Certain Assets [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition			Dec. 31, 2015
Contingent consideration	1,200		$ 1,200
Description of Acquired Entity			designs and manufactures underwater locator beacons used to locate aircraft cockpit voice recorders, flight data recorders, marine ship voyage recorders and other devices which have been submerged under water
Maximum amount of contingent consideration	2,000		$ 2,000
Electronic Technologies Group [Member] | Robertson [Member]
Business Acquisition [Line Items]
Name of Acquired Entity			Robertson Fuel Systems, LLC
Effective Date of Acquisition			Jan. 11, 2016
Description of Acquired Entity			Robertson is a world leader in the design and production of mission-extending, crashworthy and ballistically self-sealing auxiliary fuel systems for military rotorcraft.
Acquisition costs	3,100		$ 3,100
Revenue, Net	30,600		60,100
Net income attributable to HEICO	$ 5,000		$ 8,800
Customer Relationships [Member] | Electronic Technologies Group [Member] | Robertson [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			15 years
Intellectual Property [Member] | Electronic Technologies Group [Member] | Robertson [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			22 years