ACQUISITIONS (Details Textuals) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired									$ 263,811	$ 166,784	$ 8,737
Net sales	$ 363,299	$ 356,084	$ 350,648	$ 306,227	$ 328,672	$ 300,370	$ 291,421	$ 268,185	1,376,258	1,188,648	1,132,311
Net income attributable to HEICO	44,262	$ 42,002	$ 38,657	$ 31,271	38,250	$ 34,369	$ 33,105	$ 27,640	156,192	133,364	121,293
Contingent consideration, liability	18,881				$ 21,405				18,881	21,405
Additional Purchase Consideration Paid											2,000
Business Acquisition, Transaction Costs	$ 3,200								3,200
FY 2015 Acquisition [Member]
Business Acquisition [Line Items]
Net sales									62,900
Net income attributable to HEICO									$ 7,900
Astroseal Products Manufacturing Corp [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Astroseal Products Mfg. Corporation
Date on which the acquirer obtains control of the acquiree									Aug. 31, 2015
Description of the acquired entity									Astroseal manufactures expanded foil mesh, which is integrated into composite aerospace structures for lighting strike protection in fixed and rotary wing aircraft.
Midwest Microwave Solutions [Member] | HEICO Electronic [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Midwest Microwave Solutions, Inc.
Date on which the acquirer obtains control of the acquiree									Aug. 31, 2015
Description of the acquired entity									MMS designs, manufactures and sells unique Size, Weight, Power and Cost (SWAP-C) optimized Communications and Electronic Intercept Receivers and Tuners for military and intelligence applications.
Percentage of interest acquired in the subsidiary	80.10%								80.10%
Percentage of interest owned by noncontrolling shareholders	19.90%								19.90%
Aerospace & Commercial Technologies [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Aerospace & Commercial Technologies, LLC
Date on which the acquirer obtains control of the acquiree									Aug. 31, 2015
Description of the acquired entity									ACT is a provider of products and services necessary to maintain up-to-date F-16 fighter aircraft operational capabilities.
Percentage of interest acquired in the subsidiary	80.10%								80.10%
Percentage of interest owned by noncontrolling shareholders	19.90%								19.90%
TEP [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Thermal Energy Products, Inc.
Date on which the acquirer obtains control of the acquiree									May 31, 2015
Description of the acquired entity									TEP engineers, designs and manufactures removable/reusable insulation systems for industrial, commercial, aerospace and defense applications.
Harter [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Harter Aerospace, LLC
Date on which the acquirer obtains control of the acquiree									Jan. 31, 2015
Description of the acquired entity									Harter is a globally recognized component and accessory maintenance, repair, and overhaul (MRO) station specializing in commercial aircraft accessories, including thrust reverse actuation systems and pneumatics, and electromechanical components.
Percentage of interest acquired in the subsidiary	80.10%								80.10%
Percentage of interest owned by noncontrolling shareholders	19.90%								19.90%
Aeroworks [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Aeroworks International Holding B.V.
Date on which the acquirer obtains control of the acquiree									Jan. 31, 2015
Description of the acquired entity									Aeroworks, which is headquartered in the Netherlands and maintains a significant portion of its production facilities in Thailand and Laos, is a manufacturer of both composite and metal parts used primarily in aircraft interior applications, including seating, galleys, lavatories, doors, and overhead bins.
Percentage of interest acquired in the subsidiary	80.00%								80.00%
Percentage of interest owned by noncontrolling shareholders	20.00%								20.00%
Quest Aviation [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Quest Aviation Supply, Inc.
Date on which the acquirer obtains control of the acquiree									Jun. 30, 2014
Description of the acquired entity									Quest Aviation is a niche supplier of parts to repair thrust reversers on various aircraft engines.
Electronic Technologies Group [Member]
Business Acquisition [Line Items]
Net sales									$ 511,272	$ 390,982	$ 379,404
Electronic Technologies Group [Member] | Robertson [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Robertson Fuel Systems, LLC
Cash Acquired from Acquisition									$ 3,271
Date on which the acquirer obtains control of the acquiree									Jan. 11, 2016
Net sales									$ 84,100
Net income attributable to HEICO									$ 12,300
Description of the acquired entity									Robertson designs and produces mission-extending, crashworthy and ballistically self-sealing auxiliary fuel systems for military rotorcraft.
Business Acquisition, Transaction Costs	$ 3,100								$ 3,100
Electronic Technologies Group [Member] | Robertson [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									15 years
Electronic Technologies Group [Member] | Robertson [Member] | Intellectual Property [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									22 years
Electronic Technologies Group [Member] | Certain Assets [Member]
Business Acquisition [Line Items]
Date on which the acquirer obtains control of the acquiree									Dec. 31, 2015
Description of the 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
Contingent consideration, liability	1,200								$ 1,200
Amount of contingent purchase consideration, the company could be required to pay	$ 2,000								$ 2,000