HEICO (HEI) 10-K 20 Dec 18 2018 FY Annual report Financial data

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - USD ($)	12 Months Ended
	Oct. 31, 2018	Dec. 18, 2018	Apr. 30, 2018
Document Entity Information [Abstract]
Document Fiscal Period Focus	FY
Document Period End Date	Oct. 31, 2018
Document Fiscal Year Focus	2,018
Amendment Flag	false
Entity Well-Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 7,696,256,000
Document Type	10-K
Entity Information [Line Items]
Entity Registrant Name	HEICO CORPORATION
Entity Address, Address Line One	3000 Taft Street, Hollywood, Florida
Entity Address, State or Province	Florida
Entity Address, Postal Zip Code	33,021
Entity Central Index Key	46,619
Entity Tax Identification Number	650,341,002
Current Fiscal Year End Date	--10-31
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Common Class A [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		79,575,592
Trading Symbol	hei.a
Entity Listing, Par Value Per Share	$ 0.01
Heico Common Stock [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		53,355,169
Trading Symbol	hei
Entity Listing, Par Value Per Share	$ 0.01

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017
Current assets:
Cash and cash equivalents	$ 59,599	$ 52,066
Accounts receivable, net	251,469	222,456
Inventories, net	401,553	343,628
Prepaid expenses and other current assets	21,187	13,742
Total current assets	733,808	631,892
Property, plant and equipment, net	154,739	129,883
Goodwill	1,114,832	1,081,306
Intangible assets, net	506,360	538,081
Other assets	143,657	131,269
Total assets	2,653,396	2,512,431
Current liabilities:
Current maturities of long-term debt	859	451
Trade accounts payable	107,219	89,724
Accrued expenses and other current liabilities	171,514	147,612
Income taxes payable	2,837	11,650
Total current liabilities	282,429	249,437
Long-term debt, net of current maturities	531,611	673,528
Deferred income taxes	46,644	59,026
Other long-term liabilities	157,658	151,025
Total liabilities	1,018,342	1,133,016
Commitments and contingencies
Redeemable noncontrolling interests	132,046	131,123
Shareholders' equity:
Preferred Stock	0	0
Common Stock	534	338
Capital in excess of par value	320,994	326,544
Deferred compensation obligation	3,928	3,118
HEICO stock held by irrevocable trust	(3,928)	(3,118)
Accumulated other comprehensive (loss) income	(15,256)	(10,556)
Retained earnings	1,091,183	844,247
Total HEICO shareholders' equity	1,398,251	1,161,080
Noncontrolling interests	104,757	87,212
Total shareholders' equity	1,503,008	1,248,292
Total liabilities and equity	2,653,396	2,512,431
Common Class A [Member]
Shareholders' equity:
Common Stock	$ 796	$ 507

CONSOLIDATED BALANCE SHEETS _PA

CONSOLIDATED BALANCE SHEETS [PARENTHETICAL] - $ / shares shares in Thousands	Oct. 31, 2018	Oct. 31, 2017
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized	10,000	10,000
Preferred Stock, shares issued	0	0
Common stock, par value (in dollar per share)	$ 0.01	$ 0.01
Common stock, shares authorized	150,000	150,000
Common stock, shares issued	53,355	52,776
Common stock, shares outstanding	53,355	52,776
Common Class A [Member]
Common stock, par value (in dollar per share)	$ 0.01	$ 0.01
Common stock, shares authorized	150,000	150,000
Common stock, shares issued	79,576	79,227
Common stock, shares outstanding	79,576	79,227

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Net sales	$ 1,777,721	$ 1,524,813	$ 1,376,258
Operating costs and expenses:
Cost of sales	1,087,006	950,088	860,766
Selling, general and administrative expenses	314,470	268,067	250,147
Total operating costs and expenses	1,401,476	1,218,155	1,110,913
Operating income	376,245	306,658	265,345
Interest expense	(19,901)	(9,790)	(8,272)
Other income	(58)	1,092	(23)
Income before taxes and noncontrolling interests	356,286	297,960	257,050
Income tax expense	70,600	90,300	80,900
Net income from consolidated operations	285,686	207,660	176,150
Less: Net income attributable to noncontrolling interests	26,453	21,675	19,958
Net income attributable to HEICO	$ 259,233	$ 185,985	$ 156,192
Net income per share attributable to HEICO shareholders:
Basic (in dollars per share)	$ 1.96	$ 1.41	$ 1.19
Diluted (in dollars per share)	$ 1.90	$ 1.37	$ 1.17
Weighted average number of common shares outstanding:
Basic (in shares)	132,543	131,703	130,948
Diluted (in shares)	136,696	135,588	133,145

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Net income from consolidated operations	$ 285,686	$ 207,660	$ 176,150
Other comprehensive (loss) income:
Foreign currency translation adjustments	(5,243)	15,346	353
Unrealized (loss) gain on defined benefit pension plan, net of tax	(97)	321	(661)
Amortization of unrealized loss on defined benefit pension plan, net of tax	13	29	0
Total other comprehensive (loss) income	(5,327)	15,696	(308)
Comprehensive income from consolidated operations	280,359	223,356	175,842
Less: Net income attributable to noncontrolling interests	26,453	21,675	19,958
Less: Foreign currency translation adjustments attributable to noncontrolling interests	(406)	926	(62)
Comprehensive income attributable to noncontrolling interests	26,047	22,601	19,896
Comprehensive income attributable to HEICO	$ 254,312	$ 200,755	$ 155,946

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Redeemable Noncontrolling Interests [Member]	Common Stock [Member]	Common Stock [Member]Common Class A [Member]	Capital in Excess of Par Value [Member]	Deferred Compensation Obligation [Member]	HEICO Stock Held By Irrevocable Trust [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]	Total Shareholders Equity [Member]
Balances at Oct. 31, 2015			$ 269	$ 400	$ 286,220	$ 1,783	$ (1,783)	$ (25,080)	$ 548,054	$ 83,408	$ 893,271
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 155,946							(246)	156,192
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	19,896	$ 9,968								9,928
Comprehensive Income (Loss)	175,842										165,874
Cash dividends									(10,724)		(10,724)
Issuance of Common Stock to HEICO SIP			1	1	6,890						6,892
Share-based Compensation Expense					6,434						6,434
Proceeds from stock option exercises				2	5,922						5,924
Tax benefit from stock option exercises					868						868
Distributions to noncontrolling interests		9,957								(9,060)	(9,060)
Acquisitions of noncontrolling interests		3,599
Adjustments to redemption amount of redeemable noncontrolling interests		11,818							(11,818)		(11,818)
Deferred Compensation Obligation						677
Stock Held During Period Value Deferred Compensation Obligation							(677)
Adjustments to Additional Paid in Capital, Other					(6)
Stockholders' Equity, Other										50	44
Balances at Oct. 31, 2016			270	403	306,328	2,460	(2,460)	(25,326)	681,704	84,326	1,047,705
Redeemable noncontrolling interests at Oct. 31, 2015		91,282
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Redeemable Noncontrolling Interest	19,896	9,968								9,928
Distributions to noncontrolling interests		9,957								(9,060)	(9,060)
Acquisitions of noncontrolling interests		(3,599)
Adjustments to redemption amount of redeemable noncontrolling interests		11,818							(11,818)		(11,818)
Redeemable noncontrolling interests at Oct. 31, 2016		99,512
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	200,755							14,770	185,985
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	22,601	11,637								10,964
Comprehensive Income (Loss)	223,356										211,719
Cash dividends									(12,807)		(12,807)
Stock Issued During Period, Value, Stock Dividend			68	101
Adjustments to Additional Paid in Capital, Stock Split					(169)
Dividends, Common Stock, Stock									(23)		(23)
Issuance of Common Stock to HEICO SIP					7,517						7,517
Share-based Compensation Expense					7,415						7,415
Proceeds from stock option exercises				3	5,656						5,659
Noncontrolling interests assumed related to acquisition		(23,339)
Distributions to noncontrolling interests		(10,323)								(8,078)	(8,078)
Acquisitions of noncontrolling interests		3,848							194		194
Adjustments to redemption amount of redeemable noncontrolling interests		10,806							(10,806)		(10,806)
Deferred Compensation Obligation						658
Stock Held During Period Value Deferred Compensation Obligation							(658)
Adjustments to Additional Paid in Capital, Other					(203)						(203)
Balances at Oct. 31, 2017	1,248,292		338	507	326,544	3,118	(3,118)	(10,556)	844,247	87,212	1,248,292
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Redeemable Noncontrolling Interest	22,601	11,637								10,964
Noncontrolling interests assumed related to acquisition		23,339
Distributions to noncontrolling interests		(10,323)								(8,078)	(8,078)
Acquisitions of noncontrolling interests		(3,848)							(194)		(194)
Adjustments to redemption amount of redeemable noncontrolling interests		10,806							(10,806)		(10,806)
Redeemable noncontrolling interests at Oct. 31, 2017	131,123	131,123
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	254,312							(4,921)	259,233
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	26,047	13,070								12,977
Comprehensive Income (Loss)	280,359										267,289
Cash dividends									(15,363)		(15,363)
Stock Issued During Period, Value, Stock Dividend			191	286
Adjustments to Additional Paid in Capital, Stock Split					(477)
Dividends, Common Stock, Stock									(28)		(28)
Issuance of Common Stock to HEICO SIP			1	1	7,868						7,870
Share-based Compensation Expense					9,283						9,283
Proceeds from stock option exercises			7	2	4,022						4,031
Redemption of common stock related to stock option exercises			(3)		(24,980)						(24,983)
Noncontrolling interests assumed related to acquisition		(2,491)								(5,350)	(5,350)
Distributions to noncontrolling interests		(12,005)								(1,054)	(1,054)
Adjustments to redemption amount of redeemable noncontrolling interests		(3,627)							3,627		3,627
Deferred Compensation Obligation						810
Stock Held During Period Value Deferred Compensation Obligation							(810)
Adjustments to Additional Paid in Capital, Other					(1,266)
Stockholders' Equity, Other								221	(533)	272	(1,306)
Balances at Oct. 31, 2018	1,503,008		$ 534	$ 796	$ 320,994	$ 3,928	$ (3,928)	$ (15,256)	1,091,183	104,757	1,503,008
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Redeemable Noncontrolling Interest	26,047	13,070								12,977
Noncontrolling interests assumed related to acquisition		2,491								5,350	5,350
Distributions to noncontrolling interests		(12,005)								$ (1,054)	(1,054)
Adjustments to redemption amount of redeemable noncontrolling interests		(3,627)							$ 3,627		$ 3,627
Temporary Equity, Other		994
Redeemable noncontrolling interests at Oct. 31, 2018	$ 132,046	$ 132,046

CONSOLIDATED STATEMENTS OF SH_2

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY [PARENTHETICAL] - $ / shares	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Cash dividends per share (in dollars per share)	$ 0.116	$ 0.097	$ 0.082

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Operating Activities:
Net income from consolidated operations	$ 285,686	$ 207,660	$ 176,150
Adjustments to reconcile net income from consolidated operations to net cash provided by operating activities:
Depreciation and amortization	77,191	64,823	60,277
Share-based compensation expense	9,283	7,415	6,434
Employer contributions to HEICO Savings and Investment Plan	8,019	7,768	7,020
Foreign Currency Transaction Loss, before Tax	365	3,347	13
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset	(1,365)
Accrued contingent consideration		1,100	3,063
Deferred income tax benefit	(12,977)	(11,096)	(9,194)
Other	0	0	(644)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(28,569)	2,846	(15,955)
Inventories	(49,455)	(21,204)	(14,421)
Prepaid expenses and other current assets	401	134	(2,356)
Trade accounts payable	17,403	6,386	4,074
Accrued expenses and other current liabilities	22,121	1,794	35,279
Income taxes payable	(12,530)	6,071	1,443
Change in long-term liabilities and assets related to HEICO LCP	11,610	12,841	10,811
Other	1,304	(1,600)	(2,281)
Net cash provided by operating activities	328,487	288,285	259,713
Investing Activities:
Acquisitions, net of cash acquired	(59,775)	(418,265)	(263,811)
Capital expenditures	(41,871)	(25,998)	(30,863)
Net Investment Related to HEICO LCP	(11,500)	(13,400)	(10,529)
Other	(365)	(552)	(2,942)
Net cash used in investing activities	(113,511)	(458,215)	(308,145)
Financing Activities:
Payments on revolving credit facility	(204,000)	(190,877)	(170,000)
Borrowings on revolving credit facility	56,000	404,000	260,000
Redemption of common stock related to stop option exercises	(24,983)	(203)	(4)
Cash dividends paid	(15,363)	(12,807)	(10,724)
Distributions to noncontrolling interests	(13,059)	(18,401)	(19,017)
Payment of contingent consideration	(5,425)	(7,039)	(6,329)
Revolving credit facility issuance costs	(4,067)	(270)
Acquisitions of noncontrolling interests	0	(3,848)	(3,599)
Proceeds from stock option exercises	4,031	5,659	5,924
Other	(669)	(342)	521
Net cash (used in) provided by financing activities	(207,535)	175,872	56,772
Effect of exchange rate changes on cash	92	3,169	1,012
Net increase (decrease) in cash and cash equivalents	7,533	9,111	9,352
Cash and cash equivalents at beginning of year	52,066	42,955	33,603
Cash and cash equivalents at end of year	$ 59,599	$ 52,066	$ 42,955

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Oct. 31, 2018
Summary Of Significant Accounting Policies (Policies) [Abstract]
Significant Accounting Policies [Text Block]	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Business HEICO Corporation, through its principal subsidiaries consisting of HEICO Aerospace Holdings Corp. (“HEICO Aerospace”), HEICO Flight Support Corp. and HEICO Electronic Technologies Corp. (“HEICO Electronic”) and their respective subsidiaries (collectively, the “Company”), is principally engaged in the design, manufacture and sale of aerospace, defense and electronic related products and services throughout the United States ("U.S.") and internationally. The Company’s customer base is primarily the aviation, defense, space, medical, telecommunications and electronics industries. Basis of Presentation The Company has two operating segments: the Flight Support Group (“FSG”), consisting of HEICO Aerospace and HEICO Flight Support Corp. and their respective subsidiaries; and the Electronic Technologies Group (“ETG”), consisting of HEICO Electronic and its subsidiaries. The consolidated financial statements include the financial accounts of HEICO Corporation and its subsidiaries, all of which are wholly owned except for HEICO Aerospace, which is 20% owned by Lufthansa Technik AG ("LHT"), the technical services subsidiary of Lufthansa German Airlines. In addition, HEICO Aerospace consolidates two subsidiaries which are 80.1% and 82.3% owned, respectively, and a joint venture, which is 84% owned. Also, HEICO Flight Support Corp. consolidates two subsidiaries which are 80% and 84% , owned, respectively, and four subsidiaries that are each 80.1% owned. Furthermore, HEICO Electronic consolidates four subsidiaries, which are 80.1% , 80.1% , 82.5% , and 95.9% owned, respectively. Additionally, a wholly owned subsidiary of HEICO Electronic consolidates two subsidiaries which are 78% and 85% owned, respectively, while an 82.5% owned subsidiary of HEICO Electronic consolidates a subsidiary in which it has a 53.1% controlling interest. See Note 11, Redeemable Noncontrolling Interests. All intercompany balances and transactions are eliminated. Stock Splits In June 2018, December 2017 and March 2017, the Company's Board of Directors declared a 5-for-4 stock split on both classes of the Company's common stock. The stock splits were effected as of June 28, 2018, January 18, 2018 and April 19, 2017, respectively, in the form of a 25% stock dividend distributed to shareholders of record as of June 21, 2018, January 3, 2018 and April 7, 2017, respectively. All applicable share and per share information has been adjusted retrospectively to give effect to the 5-for-4 stock splits. Use of Estimates and Assumptions The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Cash and Cash Equivalents For purposes of the consolidated financial statements, the Company considers all highly liquid investments such as U.S. Treasury bills and money market funds, without liquidity fees or redemption gates, with an original maturity of three months or less at the time of purchase to be cash equivalents. Accounts Receivable Accounts receivable consist of amounts billed and currently due from customers and unbilled costs and estimated earnings related to revenue from certain fixed price contracts recognized on the percentage-of-completion method that have been recognized for accounting purposes, but not yet billed to customers. The valuation of accounts receivable requires that the Company set up an allowance for estimated uncollectible accounts and record a corresponding charge to bad debt expense. The Company estimates uncollectible receivables based on such factors as its prior experience, its appraisal of a customer’s ability to pay, age of receivables outstanding and economic conditions within and outside of the aviation, defense, space, medical, telecommunications and electronics industries. Concentrations of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of temporary cash investments and trade accounts receivable. The Company places its temporary cash investments with high credit quality financial institutions and limits the amount of credit exposure to any one financial institution. Concentrations of credit risk with respect to trade receivables are limited due to the large number of customers comprising the Company’s customer base and their dispersion across many different geographical regions. The Company performs ongoing credit evaluations of its customers, but does not generally require collateral to support customer receivables. Inventory Inventory is stated at the lower of cost or net realizable value, with cost being determined on the first-in, first-out or the average cost basis. Losses, if any, are recognized fully in the period when identified. The Company periodically evaluates the carrying value of inventory, giving consideration to factors such as its physical condition, sales patterns and expected future demand in order to estimate the amount necessary to write down any slow moving, obsolete or damaged inventory. These estimates could vary significantly from actual amounts based upon future economic conditions, customer inventory levels or competitive factors that were not foreseen or did not exist when the estimated write-downs were made. In accordance with industry practice, all inventories are classified as a current asset including portions with long production cycles, some of which may not be realized within one year. Property, Plant and Equipment Property, plant and equipment is recorded at cost. Depreciation and amortization is generally provided on the straight-line method over the estimated useful lives of the various assets. The Company’s property, plant and equipment is generally depreciated over the following estimated useful lives: Buildings and improvements 10 to 40 years Machinery and equipment 3 to 10 years Leasehold improvements 2 to 20 years Tooling 2 to 5 years The costs of major additions and improvements are capitalized. Leasehold improvements are amortized over the shorter of the leasehold improvement’s useful life or the lease term. Repairs and maintenance costs are expensed as incurred. Upon an asset's disposition, its cost and related accumulated depreciation are removed from the financial accounts and any resulting gain or loss is reflected within earnings. Capital Leases Assets acquired under capital leases are recorded at the lower of the asset's fair value or the present value of the future minimum lease payments, excluding any portion of the lease payments representing executory costs. The discount rate used in determining the present value of the minimum lease payments is the lower of the rate implicit in the lease or the Company's incremental borrowing rate. Assets under capital leases are included in property, plant and equipment and are depreciated over the shorter of the lease term or the useful life of the leased asset. Lease payments under capital leases are recognized as a reduction of the capital lease obligation and as interest expense. Business Combinations The Company allocates the purchase price of acquired entities to the underlying tangible and identifiable intangible assets acquired and liabilities and any noncontrolling interests assumed based on their estimated fair values, with any excess recorded as goodwill. The operating results of acquired businesses are included in the Company’s results of operations beginning as of their effective acquisition dates. Acquisition costs are generally expensed as incurred, were not material in fiscal 2018 or 2017 and totaled $3.2 million in fiscal 2016. See Note 2, Acquisitions, for additional information regarding fiscal 2016 acquisition costs. For contingent consideration arrangements, a liability is recognized at fair value as of the acquisition date with subsequent fair value adjustments recorded in operations. Additional information regarding the Company's contingent consideration arrangements may be found in Note 2, Acquisitions, and Note 7, Fair Value Measurements. Goodwill and Other Intangible Assets The Company tests goodwill for impairment annually as of October 31, or more frequently if events or changes in circumstances indicate that the carrying amount of goodwill may not be fully recoverable. In evaluating the recoverability of goodwill, the Company compares the fair value of each of its reporting units to its carrying value to determine potential impairment. If the carrying value of a reporting unit exceeds its fair value, the implied fair value of that reporting unit’s goodwill is to be calculated and an impairment loss is recognized in the amount by which the carrying value of the reporting unit’s goodwill exceeds its implied fair value, if any. The fair values of the Company's reporting units are determined by using a weighted average of a market approach and an income approach. Under the market approach, fair values are estimated using published market multiples for comparable companies. The Company calculates fair values under the income approach by taking estimated future cash flows that are based on internal projections and other assumptions deemed reasonable by management and discounting them using an estimated weighted average cost of capital. The Company’s intangible assets not subject to amortization consist principally of its trade names. The Company’s intangible assets subject to amortization are amortized on the straight-line method (except for certain customer relationships amortized on an accelerated method) over the following estimated useful lives : Customer relationships 4 to 15 years Intellectual property 4 to 22 years Licenses 10 to 17 years Patents 5 to 20 years Trade names 8 to 15 years Amortization expense of intellectual property, licenses and patents is recorded as a component of cost of sales, and amortization expense of customer relationships, non-compete agreements and trade names is recorded as a component of selling, general and administrative ("SG&A") expenses in the Company’s Consolidated Statements of Operations. The Company tests each non-amortizing intangible asset for impairment annually as of October 31, or more frequently if events or changes in circumstances indicate that the asset might be impaired. To derive the fair value of its trade names, the Company utilizes an income approach, which relies upon management's assumptions of royalty rates, projected revenues and discount rates. The Company also tests each amortizing intangible asset for impairment if events or circumstances indicate that the asset might be impaired. The test consists of determining whether the carrying value of such assets will be recovered through undiscounted expected future cash flows. If the total of the undiscounted future cash flows is less than the carrying amount of those assets, the Company recognizes an impairment loss based on the excess of the carrying amount over the fair value of the assets. The determination of fair value requires management to make a number of estimates, assumptions and judgments of such factors as projected revenues and earnings and discount rates. Investments Investments are stated at fair value based on quoted market prices. Investments that are intended to be held for less than one year are included within prepaid expenses and other current assets in the Company’s Consolidated Balance Sheets, while those intended to be held for longer than one year are classified within other assets. Unrealized gains or losses associated with available-for-sale securities are reported net of tax within other comprehensive income or (loss) in shareholders’ equity. Unrealized gains or losses associated with trading securities are recorded as a component of other income in the Company’s Consolidated Statements of Operations. Customer Rebates and Credits The Company records accrued customer rebates and credits as a component of accrued expenses and other current liabilities in the Company’s Consolidated Balance Sheets. These amounts generally relate to discounts negotiated with customers as part of certain sales contracts that are usually tied to sales volume thresholds. The Company accrues customer rebates and credits as a reduction within net sales as the revenue is recognized based on the estimated level of discount rate expected to be earned by each customer over the life of the contractual rebate period (generally one year). Accrued customer rebates and credits are monitored by management and discount levels are updated at least quarterly. Product Warranties Product warranty liabilities are estimated at the time of shipment and recorded as a component of accrued expenses and other current liabilities in the Company’s Consolidated Balance Sheets. The amount recognized is based on historical claims experience. Defined Benefit Pension Plan In connection with a prior year acquisition, the Company assumed a frozen qualified defined benefit pension plan (the "Plan"). The Plan's benefits are based on employee compensation and years of service; however, the accrued benefit for Plan participants was fixed as of the date of acquisition. The Company uses an actuarial valuation to determine the projected benefit obligation of the Plan and records the difference between the fair value of the Plan's assets and the projected benefit obligation as of October 31 in its Consolidated Balance Sheets. Additionally, any actuarial gain or loss that arises during a fiscal year that is not recognized as a component of net periodic pension income or expense is recorded as a component of other comprehensive income or (loss), net of tax. See Note 10, Employee Retirement Plans, for additional information and disclosures about the Plan. Revenue Recognition Revenue from the sale of products and the rendering of services is recognized when title and risk of loss passes to the customer, which is generally at the time of shipment. Revenue from the rendering of services represented less than 10% of consolidated net sales for all periods presented. Revenue from certain fixed price contracts for which costs can be dependably estimated is recognized on the percentage-of-completion method, measured by the percentage of costs incurred to date to estimated total costs for each contract. The percentage of the Company’s net sales recognized under the percentage-of-completion method was approximately 2% , 3% and 3% in fiscal 2018, 2017 and 2016, respectively. Contract costs include all direct material and labor costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and depreciation costs. SG&A costs are charged to expense as incurred. Revisions in cost estimates as contracts progress have the effect of increasing or decreasing profits in the period of revision. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined. Variations in actual labor performance, changes to estimated profitability, and final contract settlements may result in revisions to cost estimates and are recognized in income in the period in which the revisions are determined. Changes in estimates pertaining to percentage-of-completion contracts did not have a material effect on net income from consolidated operations in fiscal 2018, 2017 or 2016. The asset, “costs and estimated earnings in excess of billings” on uncompleted percentage-of-completion contracts, included in accounts receivable, represents revenue recognized in excess of amounts billed. The liability, “billings in excess of costs and estimated earnings,” included in accrued expenses and other current liabilities, represents billings in excess of revenue recognized on contracts accounted for under the percentage-of-completion method. Billings are made based on the completion of certain milestones as provided for in the contracts. For fixed price contracts in which costs cannot be dependably estimated, revenue is recognized on the completed-contract method. A contract is considered complete when all significant costs have been incurred or the item has been accepted by the customer. Progress billings and customer advances (“billings to date”) received on fixed price contracts accounted for under the completed-contract method are classified as a reduction to contracts in process (a component of inventories), if any, and any remaining amount is included in accrued expenses and other current liabilities. Effective as of the beginning of the first quarter of fiscal 2019, the Company will adopt Accounting Standards Update ("ASU") 2014-09, “Revenue from Contracts with Customers,” which will impact the timing of revenue recognition for two types of the Company's customer contracts. See “New Accounting Pronouncements,” below for additional information. Stock-Based Compensation The Company records compensation expense associated with stock options in its Consolidated Statements of Operations based on the grant date fair value of those awards. The fair value of each stock option on the date of grant is estimated using the Black-Scholes pricing model based on certain valuation assumptions. Expected stock price volatility is based on the Company’s historical stock prices over the contractual term of the option grant and other factors. The risk-free interest rate used is based on the published U.S. Treasury yield curve in effect at the time of the option grant for instruments with a similar life. The dividend yield reflects the Company’s expected dividend yield at the date of grant. The expected option life represents the period of time that the stock options are expected to be outstanding, taking into consideration the contractual term of the option grant and employee historical exercise behavior. The Company generally recognizes stock option compensation expense ratably over the award’s vesting period. Income Taxes Income tax expense includes U.S. and foreign income taxes, plus a provision for U.S. taxes on undistributed earnings of foreign subsidiaries not deemed to be permanently invested. Deferred income taxes are provided on elements of income that are recognized for financial accounting purposes in periods different from periods recognized for income tax purposes. The Company’s policy is to recognize interest and penalties related to income tax matters as a component of income tax expense. Further information regarding income taxes can be found in Note 6, Income Taxes. Redeemable Noncontrolling Interests As further detailed in Note 11, Redeemable Noncontrolling Interests, the holders of equity interests in certain of the Company’s subsidiaries have rights (“Put Rights”) that require the Company to provide cash consideration for their equity interests (the “Redemption Amount”) at fair value or at a formula that management intended to reasonably approximate fair value based solely on a multiple of future earnings over a measurement period. The Put Rights are embedded in the shares owned by the noncontrolling interest holders and are not freestanding. The Company tracks the carrying cost of such redeemable noncontrolling interests at historical cost plus an allocation of subsidiary earnings based on ownership interest, less dividends paid to the noncontrolling interest holders. Redeemable noncontrolling interests are recorded outside of permanent equity at the higher of their carrying cost or management’s estimate of the Redemption Amount. The initial adjustment to record redeemable noncontrolling interests at the Redemption Amount results in a corresponding decrease to retained earnings. Subsequent adjustments to the Redemption Amount of redeemable noncontrolling interests may result in corresponding decreases or increases to retained earnings, provided any increases to retained earnings may only be recorded to the extent of decreases previously recorded. Adjustments to Redemption Amounts based on fair value will have no effect on net income per share attributable to HEICO shareholders whereas the portion of periodic adjustments to the carrying amount of redeemable noncontrolling interests based solely on a multiple of future earnings that reflect a redemption amount in excess of fair value will affect net income per share attributable to HEICO shareholders. Acquisitions of redeemable noncontrolling interests are treated as equity transactions. Net Income per Share Attributable to HEICO Shareholders Basic net income per share attributable to HEICO shareholders is computed by dividing net income attributable to HEICO by the weighted average number of common shares outstanding during the period. Diluted net income per share attributable to HEICO shareholders is computed by dividing net income attributable to HEICO by the weighted average number of common shares outstanding during the period plus potentially dilutive common shares arising from the assumed exercise of stock options, if dilutive. The dilutive impact of potentially dilutive common shares is determined by applying the treasury stock method. Foreign Currency All assets and liabilities of foreign subsidiaries that do not utilize the U.S. dollar as its functional currency are translated at period-end exchange rates, while revenue and expenses are translated using average exchange rates for the period. Unrealized translation gains or losses are reported as foreign currency translation adjustments through other comprehensive income or (loss) in shareholders’ equity. Transaction gains or losses related to balances denominated in a currency other than the functional currency are recorded in the Company's Consolidated Statements of Operations. Contingencies Losses for contingencies such as product warranties, litigation and environmental matters are recognized in income when they are probable and can be reasonably estimated. Gain contingencies are not recognized in income until they have been realized. New Accounting Pronouncements In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, which provides a comprehensive new revenue recognition model that will supersede nearly all existing revenue recognition guidance. Under ASU 2014-09, an entity will recognize revenue when it transfers promised goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. The guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. ASU 2014-09, as amended, is effective for fiscal years and interim reporting periods within those years beginning after December 15, 2017, or in fiscal 2019 for HEICO. ASU 2014-09 shall be applied either retrospectively to each prior reporting period presented (“full retrospective method”) or retrospectively with the cumulative effect of initially applying ASU 2014-09 recognized at the date of initial application (“modified retrospective method”). The Company has completed a review of its customer contracts and has evaluated the impact of ASU 2014-09 on each of its primary revenue streams. While the Company finalizes its overall assessment of the amended guidance, the most significant impact relates to the timing of revenue recognition, presentation and disclosures. ASU 2014-09 will impact the timing of revenue recognition for two types of the Company’s customer contracts. For certain contracts under which it produces products with no alternative use and for which the Company has an enforceable right to payment during the production cycle and for certain other contracts under which the Company creates or enhances customer-owned assets while performing repair and overhaul services, ASU 2014-09 will require HEICO to recognize revenue using an over-time recognition model as opposed to the Company’s current policy of recognizing revenue at the time of shipment. For impacted customer contracts, the adoption of ASU 2014-09 will accelerate revenue recognition and the associated cost of sales. Effective as of the beginning of the first quarter of fiscal 2019, the Company will adopt ASU 2014-09 using the modified retrospective method and recognize a cumulative effect adjustment to retained earnings based on any open contracts at that time for which revenue recognition has changed from a point-in-time recognition model to an over-time recognition model. While the ongoing impact to net sales and net income is not expected to be material to the Company’s consolidated results of operations, the future impact of ASU 2014-09 is dependent on the mix and nature of specific customer contracts. The Company is nearing completion of implementing changes to its business processes, systems and controls needed to support recognition and disclosure requirements under ASU 2014-09. In July 2015, the FASB issued ASU 2015-11, "Simplifying the Measurement of Inventory,” which requires entities to measure inventories at the lower of cost or net realizable value. Previously, inventories were measured at the lower of cost or market. The Company adopted ASU 2015-11 in the first quarter of fiscal 2018, resulting in no material effect on the Company's consolidated results of operations, financial position or cash flows. In February 2016, the FASB issued ASU 2016-02, “Leases," which requires recognition of lease assets and lease liabilities on the balance sheet of lessees. ASU 2016-02 is effective for fiscal years and interim reporting periods within those years beginning after December 15, 2018, or in fiscal 2020 for HEICO. Early adoption is permitted. ASU 2016-02, as amended, provides certain optional transition relief and shall be applied either at the beginning of the earliest comparative period presented in the year of adoption using a modified retrospective transition approach or by recognizing a cumulative effect adjustment at the date of adoption. The Company is currently evaluating the effect the adoption of this guidance will have on its consolidated results of operations, financial position and cash flows. In August 2016, the FASB issued ASU 2016-15, "Classification of Certain Cash Receipts and Cash Payments," which clarifies how certain cash receipts and cash payments are to be presented and classified in the statement of cash flows. The Company adopted ASU 2016-15 on a retrospective basis in the fourth quarter of fiscal 2018, which requires that proceeds from corporate-owned life insurance policies be classified as cash inflows from investing activities. Such proceeds aggregated $.1 million over the past three fiscal years and were all received in fiscal 2016. In addition, and as permitted by ASU 2016-15, the Company has elected to classify investments related to the HEICO Corporation Leadership Compensation Plan as cash outflows from investing activities as such investments primarily represent premium payments on corporate-owned life insurance policies. The adoption of ASU 2016-15 resulted in an $11.5 million , $13.4 million and $10.5 million increase in cash provided by operating activities and in cash used in investing activities in fiscal 2018, 2017 and fiscal 2016, respectively.

ACQUISITIONS

ACQUISITIONS	12 Months Ended
	Oct. 31, 2018
Acquisitions [Abstract]
Business Combination Disclosure [Text Block]	ACQUISITIONS AAT Acquisition On September 15, 2017 , the Company, through HEICO Electronic, acquired all of the outstanding stock of AeroAntenna Technology, Inc. ("AAT"). The purchase price of this acquisition was paid in cash using proceeds from the Company's revolving credit facility. AAT designs and produces high performance active antenna systems for commercial aircraft, precision guided munitions, other defense applications and commercial uses. The Company believes that this acquisition is consistent with HEICO’s practice of acquiring high quality niche designers and manufacturers who also focus on customer needs and will further enable the Company to broaden its product offerings, technologies and customer base. The following table summarizes the total consideration for the acquisition of AAT (in thousands): Cash paid $317,500 Less: cash acquired (868 ) Cash paid, net 316,632 Contingent consideration 13,797 Additional purchase consideration 544 Total consideration $330,973 As noted in the table above, the total consideration includes an accrual of $13.8 million as of the acquisition date representing the estimated fair value of contingent consideration the Company may be obligated to pay should AAT meet certain earnings objectives during the first six years following the acquisition. See Note 7, Fair Value Measurements, for additional information regarding the Company's contingent consideration obligation. The following table summarizes the allocation of the total consideration for the acquisition of AAT to the estimated fair values of the tangible and identifiable intangible assets acquired and liabilities assumed (in thousands): Assets acquired: Goodwill $157,901 Customer relationships 100,000 Intellectual property 39,000 Trade name 20,000 Inventories 8,306 Accounts receivable 6,115 Property, plant and equipment 1,893 Other assets 208 Total assets acquired, excluding cash 333,423 Liabilities assumed: Accounts payable 1,299 Accrued expenses 1,151 Total liabilities assumed 2,450 Net assets acquired, excluding cash $330,973 The primary items that generated the goodwill recognized were the premiums paid by the Company for the future earnings potential of AAT and the value of its assembled workforce that do not qualify for separate recognition. The amortization period of the customer relationships, intellectual property and trade name acquired is 15 years , 15 years and indefinite, respectively. The operating results of AAT were included in the Company’s results of operations from the effective acquisition date. The Company's consolidated net sales and net income attributable to HEICO for the fiscal year ended October 31, 2017 includes $10.2 million and $2.5 million , respectively from the acquisition of AAT. The following table presents unaudited pro forma financial information for fiscal 2017 and fiscal 2016 as if the acquisition of AAT had occurred as of November 1, 2015 (in thousands, except per share data): Year ended October 31, 2017 2016 Net sales $1,582,653 $1,428,336 Net income from consolidated operations $220,419 $185,070 Net income attributable to HEICO $198,744 $165,112 Net income per share attributable to HEICO shareholders: Basic $1.51 $1.26 Diluted $1.47 $1.24 The pro forma financial information is presented for comparative purposes only and is not necessarily indicative of the results of operations that actually would have been achieved if the acquisition had taken place as of November 1, 2015. The unaudited pro forma financial information includes adjustments to historical amounts such as additional amortization expense related to intangible assets acquired, increased interest expense associated with borrowings to finance the acquisition and inventory purchase accounting adjustments charged to cost of sales as the inventory is sold. Robertson Acquisition On January 11, 2016 , the Company, through HEICO Electronic, acquired all of the limited liability company interests of Robertson Fuel Systems, LLC ("Robertson"). The purchase price of this acquisition was paid in cash using proceeds from the Company’s revolving credit facility. Robertson designs and produces mission-extending, crashworthy and ballistically self-sealing auxiliary fuel systems for military rotorcraft. The Company believes that this acquisition is consistent with HEICO’s practice of acquiring outstanding niche designers and manufacturers of critical components in the defense industry and will further enable the Company to broaden its product offerings, technologies and customer base. The following table summarizes the total consideration for the acquisition of Robertson (in thousands): Cash paid $256,293 Less: cash acquired (3,271 ) Total consideration $253,022 The following table summarizes the allocation of the total consideration for the acquisition of Robertson to the estimated fair values of the tangible and identifiable intangible assets acquired and liabilities assumed (in thousands): Assets acquired: Goodwill $93,425 Customer relationships 55,100 Intellectual property 39,600 Trade name 28,400 Inventories 27,417 Property, plant and equipment 7,476 Accounts receivable 4,973 Other assets 1,884 Total assets acquired, excluding cash 258,275 Liabilities assumed: Accounts payable 4,606 Accrued expenses 647 Total liabilities assumed 5,253 Net assets acquired, excluding cash $253,022 The primary items that generated the goodwill recognized were the premiums paid by the Company for the future earnings potential of Robertson and the value of its assembled workforce that do not qualify for separate recognition. The amortization period of the customer relationships, intellectual property and trade name acquired is 15 years , 22 years and indefinite, respectively. Acquisition costs associated with the purchase of Robertson totaled $3.1 million in fiscal 2016 and were recorded as a component of SG&A expenses in the Company's Consolidated Statements of Operations. The operating results of Robertson were included in the Company’s results of operations from the effective acquisition date. The Company's consolidated net sales and net income attributable to HEICO for the fiscal year ended October 31, 2016 includes $84.1 million and $12.3 million , respectively, from the acquisition of Robertson, exclusive of the aforementioned acquisition costs. Had the acquisition of Robertson been consummated as of November 1, 2014, net sales, net income from consolidated operations, net income attributable to HEICO, and basic and diluted net income per share attributable to HEICO shareholders on a pro forma basis for fiscal 2016 would not have been materially different than the reported amounts. Other Acquisitions In September 2018, the Company, through a subsidiary of HEICO Electronic, obtained control over 53.1% of the equity interests of SST Components, Inc. (“SST”) . SST manufactures discrete semiconductor components, tests electronic components, and custom assembles a wide variety of prototype and off the shelf components into desired package styles for military, space and commercial uses. The purchase price of this acquisition was paid using cash provided by operating activities. In August 2018, the Company, through a subsidiary of HEICO Flight Support Corp., acquired all of the business and assets of Optical Display Engineering ("ODE") . ODE is a Federal Aviation Administration ("FAA")-authorized Part 145 Repair Station focusing on the repair of LCD screens and display modules for aviation displays used in civilian and military aircraft. ODE also holds FAA-Parts Manufacturer Approval authority to supply products that it repairs. The purchase price of this acquisition was paid in cash, principally using cash provided by operating activities. In April 2018, the Company, through a subsidiary of HEICO Electronic, acquired all of the assets and business of the Emergency Locator Transmitter Beacon product line ("ELT Product Line") of Instrumar Limited. The ELT Product Line designs and manufactures Emergency Locator Transmitter Beacons for the commercial aviation and defense markets, that upon activation, transmit a distress signal to alert search and rescue operations of the aircraft's location. The purchase price of this acquisition was paid using cash provided by operating activities. In February 2018, the Company, through a subsidiary of HEICO Electronic, acquired 85% of the assets and business of Sensor Technology Engineering, Inc. ("Sensor Technology") . Sensor Technology designs and manufactures sophisticated nuclear radiation detectors for law enforcement, homeland security and military applications. The remaining 15% continues to be owned by certain members of Sensor Technology's management team (see Note 11, Redeemable Noncontrolling Interests, for additional information). In November 2017, the Company, through a subsidiary of HEICO Electronic, acquired all of the stock of Interface Displays & Controls, Inc. ("IDC") . IDC designs and manufactures electronic products for aviation, marine, military fighting vehicles, and embedded computing markets. The purchase price of this acquisition was paid using cash provided by operating activities. In June 2017, the Company, through a subsidiary of the HEICO Flight Support Corp., acquired all of the ownership interests of Carbon by Design ("CBD"). CBD is a manufacturer of composite components for UAVs, rockets, spacecraft and other specialized applications. The purchase price of CBD was paid using cash provided by operating activities. In April 2017, the Company, through a subsidiary of HEICO Flight Support Corp., acquired 80.1% of the equity interests of LLP Enterprises, LLC, which owns all of the outstanding equity interests of the operating units of Air Cost Control ("A2C"). A2C is a leading aviation electrical interconnect product distributor of items such as connectors, wire, cable, protection and fastening systems, in addition to distributing a wide range of electromechanical parts. The remaining 19.9% interest continues to be owned by certain members of A2C's management team (see Note 11, Redeemable Noncontrolling Interests, for additional information). In December 2015, the Company, through a subsidiary of HEICO Electronic, acquired certain assets of a company that 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 . The total consideration includes an accrual as of the acquisition date representing the estimated fair value of contingent consideration the Company may be obligated to pay in aggregate during the first five years following the acquisition. See Note 7, Fair Value Measurements, for additional information regarding the Company's contingent consideration obligation. The purchase price of this acquisition was paid using cash provided by operating activities. Unless otherwise noted, the purchase price of each of the above referenced other acquisitions was paid in cash, principally using proceeds from the Company's revolving credit facility, and is not material or significant to the Company's consolidated financial statements. The following table summarizes the aggregate total consideration for the Company's other acquisitions (in thousands): Year ended October 31, 2018 2017 2016 Cash paid $61,931 $109,346 $11,000 Less: cash acquired (4,000 ) (7,713 ) — Cash paid, net 57,931 101,633 11,000 Contingent consideration — — 1,225 Additional purchase consideration (407 ) 1,300 — Total consideration $57,524 $102,933 $12,225 The following table summarizes the allocation of the aggregate total consideration for the Company's other acquisitions to the estimated fair values of the tangible and identifiable intangible assets acquired and liabilities and noncontrolling interests assumed (in thousands): Year ended October 31, 2018 2017 2016 Assets acquired: Goodwill $38,320 $49,932 $6,876 Customer relationships 11,620 29,500 2,800 Trade names 760 16,750 300 Intellectual property 6,970 1,950 2,000 Inventories 6,219 28,410 249 Accounts receivable 1,488 15,165 — Property, plant and equipment 1,807 4,522 — Other assets 51 982 — Total assets acquired, excluding cash 67,235 147,211 12,225 Liabilities assumed: Accounts payable 671 7,696 — Accrued expenses 1,522 6,054 — Deferred income taxes — 5,432 — Other liabilities — 1,434 — Total liabilities assumed 2,193 20,616 — Noncontrolling interests in consolidated subsidiaries 7,518 23,662 — Net assets acquired, excluding cash $57,524 $102,933 $12,225 The following table summarizes the weighted average amortization period of the definite-lived intangible assets acquired in connection with the Company's other fiscal 2018, 2017 and 2016 acquisitions (in years): Year ended October 31, 2018 2017 2016 Customer relationships 7 12 11 Trade names — — 15 Intellectual property 10 13 15 The allocation of the total consideration of the Company's other fiscal 2018 acquisitions to the tangible and identifiable intangible assets acquired and liabilities and noncontrolling interests assumed is preliminary until the Company obtains final information regarding their fair values. However, the Company does not expect any adjustments to such allocations to be material to the Company's consolidated financial statements. The primary items that generated the goodwill recognized were the premiums paid by the Company for the future earnings potential of the businesses acquired and the value of their assembled workforces that do not qualify for separate recognition, which, in the case of Sensor Technology and A2C benefit both the Company and the noncontrolling interest holders. The fair value of the noncontrolling interests in Sensor Technology and A2C was determined based on the consideration paid by the Company for its controlling ownership interest adjusted for a lack of control that a market participant would consider when estimating the fair value of the noncontrolling interest. The operating results of the Company's other fiscal 2018 acquisitions were included in the Company's results of operations from each of the effective acquisition dates. The amount of net sales and earnings of the Company's other fiscal 2018 acquisitions included in the Consolidated Statement of Operations is not material. Had the other fiscal 2018 acquisitions occurred as of November 1, 2016, net sales, net income from consolidated operations, net income attributable to HEICO, and basic and diluted net income per share attributable to HEICO shareholders on a pro forma basis for fiscal 2018 and 2017 would not have been materially different than the reported amounts. The operating results of the Company's other fiscal 2017 acquisitions were included in the Company's results of operations from each of the effective acquisition dates. The Company's consolidated net sales for the fiscal year ended October 31, 2017 includes $49.0 million from the other fiscal 2017 acquisitions. The amount of earnings of the other fiscal 2017 acquisitions included in the Company's results of operations for the fiscal year ended October 31, 2017 is not material. Had the other fiscal 2017 acquisitions occurred as of November 1, 2015, net sales on a pro forma basis for fiscal 2017 would not have been materially different than the reported amounts and net sales on a pro forma basis for fiscal 2016 would have been $1,464.5 million . Net income from consolidated operations, net income attributable to HEICO, and basic and diluted net income per share attributable to HEICO shareholders on a pro forma basis for fiscal 2017 and 2016 would not have been materially different than the reported amounts. The pro forma financial information is presented for comparative purposes only and is not necessarily indicative of the results of operations that actually would have been achieved if the acquisitions had taken place as of November 1, 2015.

SELECTED FINANCIAL STATEMENT IN

SELECTED FINANCIAL STATEMENT INFORMATION	12 Months Ended
	Oct. 31, 2018
Selected Financial Statement Information [Abstract]
Additional Financial Information Disclosure [Text Block]	SELECTED FINANCIAL STATEMENT INFORMATION Accounts Receivable As of October 31, (in thousands) 2018 2017 Accounts receivable $254,727 $225,462 Less: Allowance for doubtful accounts (3,258 ) (3,006 ) Accounts receivable, net $251,469 $222,456 Costs and Estimated Earnings on Uncompleted Percentage-of-Completion Contracts As of October 31, (in thousands) 2018 2017 Costs incurred on uncompleted contracts $39,350 $29,491 Estimated earnings 19,708 19,902 59,058 49,393 Less: Billings to date (45,731 ) (41,262 ) $13,327 $8,131 Included in the accompanying Consolidated Balance Sheets under the following captions: Accounts receivable, net (costs and estimated earnings in excess of billings) $14,183 $9,377 Accrued expenses and other current liabilities (billings in excess of costs and estimated earnings) (856 ) (1,246 ) $13,327 $8,131 Changes in estimates pertaining to percentage-of-completion contracts did not have a material effect on net income from consolidated operations in fiscal 2018, 2017 or 2016. Inventories As of October 31, (in thousands) 2018 2017 Finished products $192,758 $173,559 Work in process 49,315 39,986 Materials, parts, assemblies and supplies 158,039 128,031 Contracts in process 1,649 2,415 Less: Billings to date (208 ) (363 ) Inventories, net of valuation reserves $401,553 $343,628 Contracts in process represents accumulated capitalized costs associated with fixed price contracts. Related progress billings and customer advances (“billings to date”) are classified as a reduction to contracts in process, if any, and any excess is included in accrued expenses and other liabilities. Property, Plant and Equipment As of October 31, (in thousands) 2018 2017 Land $5,864 $5,435 Buildings and improvements 101,424 91,916 Machinery, equipment and tooling 230,108 191,298 Construction in progress 5,044 5,553 342,440 294,202 Less: Accumulated depreciation and amortization (187,701 ) (164,319 ) Property, plant and equipment, net $154,739 $129,883 The amounts set forth above include tooling costs having a net book value of $8.2 million and $7.6 million as of October 31, 2018 and 2017, respectively. Amortization expense on capitalized tooling was $2.8 million , $2.7 million and $2.9 million in fiscal 2018, 2017 and 2016, respectively. The amounts set forth above also include $11.9 million and $4.8 million of assets under capital leases as of October 31, 2018 and October 31, 2017, respectively. Accumulated depreciation associated with assets under capital leases was $1.5 million and $1.0 million as of October 31, 2018 and October 31, 2017, respectively. See Note 5, Long-Term Debt, for additional information pertaining to capital lease obligations. Depreciation and amortization expense, exclusive of tooling, on property, plant and equipment was $23.2 million , $21.9 million and $20.4 million in fiscal 2018, 2017 and 2016, respectively. Accrued Expenses and Other Current Liabilities As of October 31, (in thousands) 2018 2017 Accrued employee compensation and related payroll taxes $97,048 $78,058 Deferred revenue 28,262 29,247 Accrued customer rebates and credits 16,861 12,866 Contingent consideration and other accrued purchase consideration 6,138 7,588 Other 23,205 19,853 Accrued expenses and other current liabilities $171,514 $147,612 The increase in accrued employee compensation and related payroll taxes principally reflects a higher level of accrued performance-based compensation resulting from the improved consolidated operating results and the impact of our fiscal 2018 acquisitions. The total customer rebates and credits deducted within net sales in fiscal 2018, 2017 and 2016 was $9.9 million , $11.0 million and $10.8 million , respectively. Other Long-Term Assets and Liabilities The Company provides eligible employees, officers and directors of the Company the opportunity to voluntarily defer base salary, bonus payments, commissions, long-term incentive awards and directors fees, as applicable, on a pre-tax basis through the HEICO Corporation Leadership Compensation Plan (“LCP”), a nonqualified deferred compensation plan that conforms to Section 409A of the Internal Revenue Code. The Company matches 50% of the first 6% of base salary deferred by each participant. Director fees that would otherwise be payable in Company common stock may be deferred into the LCP, and, when distributable, are distributed in actual shares of Company common stock. The LCP does not provide for diversification of a director’s assets allocated to Company common stock. The deferred compensation obligation associated with Company common stock is recorded as a component of shareholders’ equity at cost and subsequent changes in fair value are not reflected in operations or shareholders’ equity of the Company. Further, while the Company has no obligation to do so, the LCP also provides the Company the opportunity to make discretionary contributions. The Company’s matching contributions and any discretionary contributions are subject to vesting and forfeiture provisions set forth in the LCP. Company contributions to the LCP charged to income in fiscal 2018, 2017 and 2016 totaled $5.9 million , $4.6 million and $6.8 million , respectively. The aggregate liabilities of the LCP were $125.8 million and $116.0 million as of October 31, 2018 and 2017, respectively, and are classified within other long-term liabilities in the Company’s Consolidated Balance Sheets. The assets of the LCP, totaling $126.8 million and $117.2 million as of October 31, 2018 and 2017, respectively, are classified within other assets and principally represent cash surrender values of life insurance policies that are held within an irrevocable trust that may be used to satisfy the obligations under the LCP. Other long-term liabilities also includes deferred compensation of $5.9 million and $5.7 million as of October 31, 2018 and 2017, respectively, principally related to elective deferrals of salary and bonuses under a Company sponsored non-qualified deferred compensation plan formerly available to selected employees. The Company makes no contributions to this plan. The assets of this plan, which equaled the deferred compensation liability as of October 31, 2018 and 2017, respectively, are held within an irrevocable trust and classified within other assets in the Company’s Consolidated Balance Sheets. Additional information regarding the assets of this deferred compensation plan and the LCP may be found in Note 7, Fair Value Measurements. Research and Development Expenses The amount of new product research and development ("R&D") expenses included in cost of sales is as follows (in thousands): Year ended October 31, 2018 2017 2016 R&D expenses $57,450 $46,473 $44,726 Accumulated Other Comprehensive Loss Changes in the components of accumulated other comprehensive loss during fiscal 2018 and 2017 are as follows (in thousands): Foreign Currency Translation Pension Benefit Obligation Accumulated Other Comprehensive Loss Balances as of October 31, 2016 ($23,953 ) ($1,373 ) ($25,326 ) Unrealized gain 14,420 321 14,741 Amortization of unrealized loss — 29 29 Balances as of October 31, 2017 (9,533 ) (1,023 ) (10,556 ) Unrealized (loss) gain (4,837 ) 124 (4,713 ) Amortization of unrealized loss — 13 13 Balances as of October 31, 2018 ($14,370 ) ($886 ) ($15,256 )

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	12 Months Ended
	Oct. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	GOODWILL AND OTHER INTANGIBLE ASSETS Changes in the carrying amount of goodwill during fiscal 2018 and 2017 by operating segment are as follows (in thousands): Segment Consolidated FSG ETG Totals Balances as of October 31, 2016 $336,681 $529,036 $865,717 Goodwill acquired 48,960 160,903 209,863 Foreign currency translation adjustments 2,965 2,761 5,726 Balances as of October 31, 2017 388,606 692,700 1,081,306 Goodwill acquired 10,586 27,734 38,320 Adjustments to goodwill 972 (3,003 ) (2,031 ) Foreign currency translation adjustments (1,470 ) (1,293 ) (2,763 ) Balances as of October 31, 2018 $398,694 $716,138 $1,114,832 The goodwill acquired during fiscal 2018 and 2017 relates to the acquisitions consummated in those respective years as described in Note 2, Acquisitions, and represents the residual value after the allocation of the total consideration to the tangible and identifiable intangible assets acquired and liabilities and noncontrolling interests assumed. Foreign currency translation adjustments are included in other comprehensive income (loss) in the Company's Consolidated Statements of Comprehensive Income. The adjustments to goodwill represent immaterial measurement period adjustments to the purchase price allocation of certain fiscal 2017 acquisitions. The Company estimates that most of the goodwill acquired in fiscal 2018 and 2017 is deductible for income tax purposes. Based on the annual test for goodwill impairment as of October 31, 2018, the Company determined there is no impairment of its goodwill and the fair value of each of the Company’s reporting units significantly exceeded their carrying value. Identifiable intangible assets consist of the following (in thousands): As of October 31, 2018 As of October 31, 2017 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortizing Assets: Customer relationships $373,946 ($135,359 ) $238,587 $379,966 ($117,069 ) $262,897 Intellectual property 185,983 (56,055 ) 129,928 181,811 (44,861 ) 136,950 Licenses 6,559 (3,522 ) 3,037 6,559 (2,928 ) 3,631 Patents 927 (609 ) 318 870 (551 ) 319 Non-compete agreements 814 (814 ) — 817 (817 ) — Trade names 466 (157 ) 309 466 (118 ) 348 568,695 (196,516 ) 372,179 570,489 (166,344 ) 404,145 Non-Amortizing Assets: Trade names 134,181 — 134,181 133,936 — 133,936 $702,876 ($196,516 ) $506,360 $704,425 ($166,344 ) $538,081 Amortization expense related to intangible assets was $50.1 million , $39.5 million and $36.4 million in fiscal 2018, 2017 and 2016, respectively. Amortization expense for each of the next five fiscal years and thereafter is estimated to be $49.0 million in fiscal 2019, $46.1 million in fiscal 2020, $43.4 million in fiscal 2021, $37.0 million in fiscal 2022, $32.0 million in fiscal 2023 and $164.7 million

LONG-TERM DEBT

LONG-TERM DEBT	12 Months Ended
	Oct. 31, 2018
Debt Disclosure [Abstract]
Long-term Debt [Text Block]	LONG-TERM DEBT Long-term debt consists of the following (in thousands): As of October 31, 2018 2017 Borrowings under revolving credit facility $523,000 $671,000 Capital leases and note payable 9,470 2,979 532,470 673,979 Less: Current maturities of long-term debt (859 ) (451 ) $531,611 $673,528 The Company's borrowings under its revolving credit facility mature in fiscal 2023. As of October 31, 2018 and 2017, the weighted average interest rate on borrowings under the Company's revolving credit facility was 3.4% and 2.4% , respectively. The revolving credit facility contains both financial and non-financial covenants. As of October 31, 2018, the Company was in compliance with all such covenants. Revolving Credit Facility On November 6, 2017, the Company entered into a new $1.3 billion Revolving Credit Facility Agreement ("New Credit Facility") with a bank syndicate, which matures in November 2022. Under certain circumstances, the maturity of the New Credit Facility may be extended for two one-year periods. The New Credit Facility also includes a feature that will allow the Company to increase revolving commitments under the New Credit Facility by $350 million , to become a $1.65 billion facility, through increased commitments from existing lenders or the addition of new lenders. Borrowings under the New Credit Facility may be used to finance acquisitions and for working capital and other general corporate purposes, including capital expenditures. The New Credit Facility replaced the Company's prior $1.0 billion (as amended) Revolving Credit Agreement. Borrowings under the New Credit Facility accrue interest at the Company’s election of the Base Rate or the Eurocurrency Rate, plus in each case, the Applicable Rate (based on the Company’s Total Leverage Ratio). The Base Rate for any day is a fluctuating rate per annum equal to the highest of (i) the Prime Rate; (ii) the Federal Funds Rate plus .50%; and (iii) the Eurocurrency Rate for an Interest Period of one month plus 100 basis points. The Eurocurrency Rate is the rate per annum obtained by dividing LIBOR for the applicable Interest Period by a percentage equal to 1.00 minus the daily average Eurocurrency Reserve Rate for such Interest Period, as such capitalized terms are defined in the New Credit Facility. The Applicable Rate for Eurocurrency Rate Loans ranges from 1.00% to 2.00% . The Applicable Rate for Base Rate Loans ranges from 0% to 1.00% . A fee is charged on the amount of the unused commitment ranging from .125% to .30% (depending on the Company’s Total Leverage Ratio). The New Credit Facility also includes $100 million sublimits for borrowings made in foreign currencies and for swingline borrowings, and a $50 million sublimit for letters of credit. Outstanding principal, accrued and unpaid interest and other amounts payable under the New Credit Facility may be accelerated upon an event of default, as such events are described in the New Credit Facility. The New Credit Facility is unsecured and contains covenants that require, among other things, the maintenance of a Total Leverage Ratio and an Interest Coverage Ratio, as such capitalized terms are defined in the New Credit Facility. Capital Lease Obligations The Company's capital lease obligations are principally for manufacturing facilities including a 14-year lease that a subsidiary of HEICO Flight Support became party to during fiscal 2018. The estimated future minimum lease payments of all capital leases for the next five fiscal years and thereafter are as follows (in thousands): Year ending October 31, 2019 $1,240 2020 1,191 2021 1,184 2022 1,175 2023 873 Thereafter 6,412 Total minimum lease payments 12,075 Less: amount representing interest (2,718 ) Present value of minimum lease payments $9,357

INCOME TAXES

INCOME TAXES	12 Months Ended
	Oct. 31, 2018
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	INCOME TAXES The components of income before income taxes and noncontrolling interests are as follows (in thousands): Year ended October 31, 2018 2017 2016 Domestic $309,123 $264,420 $227,927 Foreign 47,163 33,540 29,123 Income before taxes and noncontrolling interests $356,286 $297,960 $257,050 The components of the provision for income taxes on income before income taxes and noncontrolling interests are as follows (in thousands): Year ended October 31, 2018 2017 2016 Current: Federal $61,548 $85,047 $75,261 State 9,420 6,820 7,463 Foreign 12,608 9,529 7,370 83,576 101,396 90,094 Deferred: Federal (13,115 ) (9,661 ) (5,979 ) State 1,578 (499 ) (2,587 ) Foreign (1,439 ) (936 ) (628 ) (12,976 ) (11,096 ) (9,194 ) Total income tax expense $70,600 $90,300 $80,900 A reconciliation of the federal statutory income tax rate to the Company’s effective tax rate is as follows: Year ended October 31, 2018 2017 2016 Federal statutory income tax rate (blended rate in fiscal 2018) 23.3 % 35.0 % 35.0 % State taxes, net of federal income tax benefit 2.9 % 1.9 % 1.7 % Discrete net tax benefit related to Tax Act (3.4 %) — % — % Research and development tax credits (2.0 %) (1.8 %) (2.7 %) Domestic production activities tax deduction (.8 %) (1.1 %) (1.3 %) Tax benefit related to stock option exercises (.5 %) (1.0 %) — % Noncontrolling interests’ share of income (.3 %) (.7 %) (.7 %) Tax-exempt losses (gains) on corporate-owned life insurance policies .1 % (1.8 %) (.1 %) Other, net .5 % (.2 %) (.4 %) Effective tax rate 19.8 % 30.3 % 31.5 % On December 22, 2017, the United States ("U.S.") government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act contains significant changes to existing tax law including, among other things, a reduction in the U.S. federal statutory tax rate from 35% to 21% and the implementation of a territorial tax system resulting in a one-time transition tax on the unremitted earnings of the Company’s foreign subsidiaries. The Tax Act also contains additional provisions that will become effective for HEICO in fiscal 2019 including a new tax on Global Intangible Low-Taxed Income (“GILTI”), a new deduction for Foreign-Derived Intangible Income (“FDII”), the repeal of the domestic production activity deduction and additional limitations on the deductibility of certain executive compensation. The Company has not yet determined the impact of the provisions of the Tax Act which do not become effective for HEICO until fiscal 2019 but does not anticipate these provisions to materially affect its consolidated results of operations, financial position or cash flows. The Securities and Exchange Commission issued Staff Accounting Bulletin No. 118 (“SAB 118”), which provides guidance on the accounting for the tax effects of the Tax Act. This guidance provides companies with a measurement period not to exceed one year from the enactment of the Tax Act to complete their accounting for the related tax effects. SAB 118 further states that during the measurement period, companies who are able to make reasonable estimates of the tax effects of the Tax Act should include those amounts in their financial statements as provisional amounts and reflect any adjustments in subsequent periods as they refine their estimates or complete their accounting of such tax effects. As a result of the Tax Act, the Company's effective federal statutory income tax rate in fiscal 2018 is a blended rate of 23.3% , which reflects the reduction in the U.S. federal statutory tax rate from 35% to 21% effective January 1, 2018. Additionally, the Company remeasured its U.S. federal net deferred tax liabilities and recorded a discrete tax benefit of $16.5 million in fiscal 2018. Further, the Company recorded a provisional discrete tax expense of $4.4 million in fiscal 2018 related to a one-time transition tax on the unremitted earnings of the Company's foreign subsidiaries. The Company intends to pay this tax over the eight-year period allowed for in the Tax Act. The Company’s effective tax rate in fiscal 2018 decreased to 19.8% from 30.3% in fiscal 2017. The decrease principally reflects the previously mentioned discrete tax benefit from the remeasurement of the Company’s U.S. federal net deferred tax liabilities and the net benefit of a lower federal statutory income tax rate, which were partially offset by the aforementioned one-time transition tax expense. Further, the decrease in fiscal 2018 was slightly moderated by an unfavorable impact from lower tax-exempt unrealized gains in the cash surrender values of life insurance policies related to the HEICO Corporation Leadership Compensation Plan ("HEICO LCP"). The Company’s effective tax rate in fiscal 2017 decreased to 30.3% from 31.5% in fiscal 2016. The decrease principally reflects the favorable impact of higher tax-exempt unrealized gains in the cash surrender values of life insurance policies related to the HEICO LCP and a $3.1 million discrete income tax benefit related to stock option exercises resulting from the adoption of ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting," in the first quarter of fiscal 2017. These decreases were partially offset by the benefit recognized in fiscal 2016 from the retroactive and permanent extension of the U.S. federal R&D tax credit that resulted in the recognition of additional income tax credits for qualified R&D activities related to the last ten months of fiscal 2015 and a less favorable benefit in fiscal 2017 from the foreign tax rate differential associated with the undistributed earnings of a fiscal 2015 acquisition. The Company files income tax returns in the U.S. federal jurisdiction and in multiple state jurisdictions. The Company is also subject to income taxes in certain jurisdictions outside the U.S., none of which are individually material to the accompanying consolidated financial statements. Generally, the Company is no longer subject to U.S. federal, state or foreign examinations by tax authorities for years prior to fiscal 2014. The Company has not made a provision for U.S. income taxes on the undistributed earnings of a fiscal 2015 foreign acquisition as such earnings are considered permanently reinvested outside of the U.S. The amount of undistributed earnings is not material to the Company's consolidated financial statements. Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The Company believes that it is more likely than not that it will generate sufficient future taxable income to utilize all of its deferred tax assets and has therefore not recorded a valuation allowance on any such asset. Significant components of the Company’s deferred tax assets and liabilities are as follows (in thousands): As of October 31, 2018 2017 Deferred tax assets: Deferred compensation liability $31,152 $47,093 Inventories 22,204 31,797 Share-based compensation 9,811 12,984 Bonus accrual 4,474 4,956 Customer rebates accrual 1,526 1,864 Vacation accrual 1,456 2,112 Deferred revenue 68 730 Other 7,084 9,230 Total deferred tax assets 77,775 110,766 Deferred tax liabilities: Goodwill and other intangible assets (112,533 ) (160,158 ) Property, plant and equipment (11,615 ) (7,887 ) Other (271 ) (1,747 ) Total deferred tax liabilities (124,419 ) (169,792 ) Net deferred tax liability ($46,644 ) ($59,026 ) As of October 31, 2018 and 2017, the Company’s liability for gross unrecognized tax benefits related to uncertain tax positions was $2.1 million and $2.0 million , respectively, of which $1.7 million and $1.3 million , respectively, would decrease the Company’s income tax expense and effective income tax rate if the tax benefits were recognized. A reconciliation of the activity related to the liability for gross unrecognized tax benefits during fiscal 2018 and 2017 is as follows (in thousands): Year ended October 31, 2018 2017 Balances as of beginning of year $2,040 $1,602 Increases related to current year tax positions 591 596 Increases related to prior year tax positions 20 — Decreases related to prior year tax positions — (24 ) Settlements (394 ) — Lapses of statutes of limitations (157 ) (134 ) Balances as of end of year $2,100 $2,040

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
	Oct. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	FAIR VALUE MEASUREMENTS The Company's assets and liabilities that were measured at fair value on a recurring basis are set forth by level within the fair value hierarchy in the following tables (in thousands): As of October 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: Deferred compensation plans: Corporate-owned life insurance $— $123,255 $— $123,255 Money market funds 3,560 — — 3,560 Equity securities 3,179 — — 3,179 Mutual funds 1,437 — — 1,437 Other 1,306 — — 1,306 Total assets $9,482 $123,255 $— $132,737 Liabilities: Contingent consideration $— $— $20,875 $20,875 As of October 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: Deferred compensation plans: Corporate-owned life insurance $— $113,220 $— $113,220 Money market funds 3,972 — — 3,972 Equity securities 2,895 — — 2,895 Mutual funds 1,541 — — 1,541 Other 1,246 — — 1,246 Total assets $9,654 $113,220 $— $122,874 Liabilities: Contingent consideration $— $— $27,573 $27,573 The Company maintains two non-qualified deferred compensation plans. The assets of the HEICO Corporation Leadership Compensation Plan ("HEICO LCP") principally represent cash surrender values of life insurance policies, which derive their fair values from investments in mutual funds that are managed by an insurance company and are classified within Level 2 and valued using a market approach. Certain other assets of the HEICO LCP represent investments in money market funds that are classified within Level 1. The assets of the Company's other deferred compensation plan are principally invested in equity securities and mutual funds that are classified within Level 1. The assets of both plans are held within irrevocable trusts and classified within other assets in the Company’s Consolidated Balance Sheets. As part of the agreement to acquire a subsidiary by the ETG in fiscal 2017, the Company may be obligated to pay contingent consideration of $20.0 million in fiscal 2023 should the acquired entity meet certain earnings objectives during the first six years following the acquisition. As of October 31, 2018, the estimated fair value of the contingent consideration was $13.9 million . As part of the agreement to acquire certain assets of a company by the ETG in fiscal 2016, the Company may be obligated to pay contingent consideration of up to $1.7 million in aggregate during the first four years following the first anniversary of the acquisition. During fiscal 2018, the Company paid $.3 million of contingent consideration based on the actual financial performance of the acquired entity during the second year following the acquisition. As of October 31, 2018, the estimated fair value of the remaining contingent consideration was $1.2 million . As part of the agreement to acquire a subsidiary by the FSG in fiscal 2015, the Company may be obligated to pay contingent consideration of up to €6.1 million per year should the acquired entity meet certain earnings objectives during each of the first four years following the acquisition. The estimated fair value of the aggregate contingent consideration as of October 31, 2017 for the third and fourth year following the acquisition was €10.8 million , or $12.6 million . During fiscal 2018, the Company paid €4.4 million , or $5.1 million , of contingent consideration based on the lower actual than anticipated earnings of the acquired entity during the third year following the acquisition and recognized a €1.3 million , or $1.8 million , reduction in accrued contingent consideration based principally on the lower actual than anticipated earnings. As of October 31, 2018, the estimated fair vale of the contingent consideration for the fourth year following the acquisition was €5.1 million , or $5.8 million . The estimated fair value of the contingent consideration arrangements described above are classified within Level 3 and were determined using a probability-based scenario analysis approach. Under this method, a set of discrete potential future subsidiary earnings was determined using internal estimates based on various revenue growth rate assumptions for each scenario. A probability of likelihood was assigned to each discrete potential future earnings estimate and the resultant contingent consideration was calculated. The resulting probability-weighted contingent consideration amounts were discounted using a weighted average discount rate reflecting the credit risk of HEICO. Changes in either the revenue growth rates, related earnings or the discount rate could result in a material change to the amount of contingent consideration accrued and such changes will be recorded in the Company's consolidated statements of operations. The Level 3 inputs used to derive the estimated fair value of the Company's contingent consideration liability as of October 31, 2018 are as follows: Fiscal 2017 Acquisition Fiscal 2016 Acquisition Fiscal 2015 Acquisition Compound annual revenue growth rate range (4%) - 7% 4 % - 13% 10 % - 13% Weighted average discount rate 6.3% 4.8% .8% Changes in the Company’s contingent consideration liability measured at fair value on a recurring basis using unobservable inputs (Level 3) during fiscal 2018 and 2017 are as follows (in thousands): Liabilities Balance as of October 31, 2016 $18,881 Contingent consideration related to acquisition 13,797 Increase in accrued contingent consideration, net 1,100 Payment of contingent consideration (7,039 ) Foreign currency transaction adjustments 834 Balance as of October 31, 2017 27,573 Payment of contingent consideration (5,425 ) Decrease in accrued contingent consideration, net (1,365 ) Foreign currency transaction adjustments 92 Balance as of October 31, 2018 $20,875 Included in the accompanying Consolidated Balance Sheet under the following captions: Accrued expenses and other current liabilities $6,107 Other long-term liabilities 14,768 $20,875 The Company recorded the increase (decrease) in accrued contingent consideration and foreign currency transaction adjustments set forth in the table above within SG&A expenses in the Company's Consolidated Statements of Operations. The Company did not have any transfers between Level 1 and Level 2 fair value measurements during fiscal 2018 and 2017.

SHAREHOLDERS' EQUITY

SHAREHOLDERS' EQUITY	12 Months Ended
	Oct. 31, 2018
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	SHAREHOLDERS’ EQUITY Common Stock and Class A Common Stock The Company has two classes of common stock that are virtually identical in all economic respects except voting rights. Each share of Common Stock is entitled to one vote per share. Each share of Class A Common Stock is entitled to a 1/10 vote per share. Holders of the Company’s common stock are entitled to receive dividends and other distributions payable in cash, property, stock or otherwise, when and if declared by the Board of Directors. In the event of liquidation, after payment of debts and other liabilities of the Company, the remaining assets of the Company will be distributable ratably among the holders of both classes of common stock. Share Repurchases In 1990, the Company's Board of Directors authorized a share repurchase program, which allows the Company to repurchase shares of Company common stock in the open market or in privately negotiated transactions at the Company's discretion, subject to certain restrictions included in the Company's revolving credit agreement. As of October 31, 2018, the maximum number of shares that may yet be purchased under this program was 4,886,353 of either or both of the Company's Class A Common Stock and the Company's Common Stock. The repurchase program does not have a fixed termination date. During fiscal 2018, 2017 and 2016, the Company did not repurchase any shares of Company common stock under this program. During fiscal 2018, the Company repurchased an aggregate 332,140 shares and 18,145 shares of Common Stock and Class A Common Stock, respectively, at a total cost of approximately $23.9 million and $1.1 million , respectively. The shares purchased represent shares tendered as payment of employee withholding taxes due upon the issuance of a share-based award. The shares purchased in fiscal 2018 did not impact the number of shares authorized for future purchase under the Company’s share repurchase program and are reflected as redemptions of common stock related to share-based compensation in the Company's Consolidated Statements of Shareholders' Equity and the Company's Consolidated Statements of Cash Flows. Such share repurchases in fiscal 2017 and 2016 were not material. Stock Splits In June 2018, December 2017 and March 2017, the Company's Board of Directors declared a 5-for-4 stock split on both classes of the Company's common stock. The stock splits were effected as of June 28, 2018, January 18, 2018 and April 19, 2017, respectively, in the form of a 25%

SHARE-BASED COMPENSATION

SHARE-BASED COMPENSATION	12 Months Ended
	Oct. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	SHARE-BASED COMPENSATION The Company currently has one stock option plan, the HEICO Corporation 2018 Incentive Compensation Plan ("2018 Plan"), which enables the Company to grant various forms of share-based compensation awards including stock options, restricted stock, restricted stock awards and stock appreciation rights. The 2018 Plan became effective in fiscal 2018 and replaced the Company's 2012 Incentive Compensation Plan (“2012 Plan”). Options outstanding under the Company's 2012 Plan, 2002 Stock Option Plan and Non-Qualified Stock Option Plan may be exercised pursuant to their terms. The total number of shares approved by the shareholders of the Company for the 2018 Plan is 5.0 million plus any options outstanding under the 2012 Plan as of the 2018 Plan's effective date that are subsequently forfeited or expire. A total of approximately 11.0 million shares of the Company's common stock are reserved for issuance to employees, directors, officers and consultants as of October 31, 2018, including 6.4 million shares currently under option and 4.6 million shares available for future grants. Stock options granted pursuant to the 2018 Plan may be designated as Common Stock and/or Class A Common Stock in such proportions as shall be determined by the Board of Directors or the Stock Option Plan Committee at its sole discretion. The exercise price per share of a stock option granted under the 2018 Plan may not be less than the fair market value of the designated class of Company common stock as of the date of grant and stock option grants vest ratably over a period specified as of the date of grant (generally five years) and expire ten years after the date of grant. Options issued under the 2018 Plan may be designated as incentive stock options or non-qualified stock options, but only employees are eligible to receive incentive stock options and no incentive stock options were outstanding as of October 31, 2018. The 2018 Plan will terminate no later than the tenth anniversary of its effective date. Information concerning share-based activity for each of the last three fiscal years ended October 31 is as follows (in thousands, except per share data): Shares Under Option Shares Available For Grant Shares Weighted Average Exercise Price Outstanding as of October 31, 2015 2,590 6,514 $13.07 Granted (586 ) 586 $23.58 Exercised — (568 ) $10.45 Cancelled 12 (12 ) $18.62 Outstanding as of October 31, 2016 2,016 6,520 $14.23 Granted (1,186 ) 1,186 $41.37 Exercised — (409 ) $15.27 Outstanding as of October 31, 2017 830 7,297 $18.58 Shares approved by the Company's shareholders for the 2018 Incentive Compensation Plan 5,000 — $— Cancelled unissued shares under the 2012 Incentive Compensation Plan (830 ) — $— Granted (412 ) 412 $65.64 Exercised — (1,285 ) $10.54 Cancelled 24 (24 ) $28.85 Outstanding as of October 31, 2018 4,612 6,400 $23.19 Information concerning stock options outstanding (all of which are vested or expected to vest) and stock options exercisable by class of common stock as of October 31, 2018 is as follows (in thousands, except per share and contractual life data): Options Outstanding Number Outstanding Weighted Average Exercise Price Weighted Average Remaining Contractual Life (Years) Aggregate Intrinsic Value Common Stock 2,955 $23.48 4.4 $178,327 Class A Common Stock 3,445 $22.94 5.5 150,649 6,400 $23.19 5.0 $328,976 Options Exercisable Number Outstanding Weighted Average Exercise Price Weighted Average Remaining Contractual Life (Years) Aggregate Intrinsic Value Common Stock 2,197 $14.75 3.0 $151,756 Class A Common Stock 2,160 $15.59 4.1 110,297 4,357 $15.17 3.5 $262,053 Information concerning stock options exercised is as follows (in thousands): Year ended October 31, 2018 2017 2016 Cash proceeds from stock option exercises $4,031 $5,659 $5,924 Tax benefit realized from stock option exercises 2,162 3,087 868 Intrinsic value of stock option exercises 75,152 10,376 9,751 Net income from consolidated operations for the fiscal years ended October 31, 2018, 2017 and 2016 includes compensation expense of $9.3 million , $7.4 million and $6.4 million , respectively, and an income tax benefit of $2.2 million , $2.8 million and $2.4 million , respectively, related to the Company’s stock options. Substantially all of the stock option compensation expense was recorded as a component of SG&A expenses in the Company’s Consolidated Statements of Operations. As of October 31, 2018, there was $26.9 million of pre-tax unrecognized compensation expense related to nonvested stock options, which is expected to be recognized over a weighted average period of approximately 3.5 years. The total fair value of stock options that vested in fiscal 2018, 2017 and 2016 was $8.5 million , $5.3 million and $5.8 million , respectively. If there were a change in control of the Company, all of the unvested options outstanding as of October 31, 2018 would become immediately exercisable. The fair value of each stock option grant in fiscal 2018, 2017 and 2016 was estimated on the date of grant using the Black-Scholes option-pricing model based on the following weighted average assumptions: Year ended October 31, 2018 2017 2016 Common Stock Class A Common Stock Common Stock Class A Common Stock Common Stock Class A Common Stock Expected stock price volatility 31.00 % 27.69 % 37.89 % 28.18 % 39.63 % 32.52 % Risk-free interest rate 2.83 % 2.81 % 2.44 % 2.06 % 2.16 % 1.82 % Dividend yield .24 % .29 % .26 % .31 % .24 % .32 % Forfeiture rate .00 % .00 % .00 % .00 % .00 % .00 % Expected option life (years) 9 8 9 7 9 6 Weighted average fair value $30.00 $20.93 $21.36 $12.47 $12.10 $7.92

EMPLOYEE RETIREMENT PLANS

EMPLOYEE RETIREMENT PLANS	12 Months Ended
	Oct. 31, 2018
Retirement Benefits [Abstract]
Pension and Other Postretirement Benefits Disclosure [Text Block]	EMPLOYEE RETIREMENT PLANS The HEICO Savings and Investment Plan (the “401(k) Plan”) is a qualified defined contribution retirement plan under which eligible employees of the Company and its participating subsidiaries may make Elective Deferral Contributions up to the limitations set forth in Section 402(g) of the Internal Revenue Code. The Company generally makes a 50% Employer Matching Contribution, as determined by the Board of Directors, based on a participant’s Elective Deferral Contribution up to 6% of the participant’s Compensation for the Elective Deferral Contribution period. The 401(k) Plan also provides that the Company may make additional Employer Contributions. Employer Contributions may be contributed in the form of the Company’s common stock or cash, as determined by the Company. Employer Contributions awarded in the form of Company common stock are valued based on the fair value of the underlying shares as of the effective date of contribution. Employer Contributions may be diversified by a participant into any of the participant-directed investment options of the 401(k) Plan; however, Employee Contributions may not be invested in Company common stock. Unless specified otherwise, all capitalized terms herein are defined in the 401(k) Plan document. Participants receive 100% vesting in Employee Contributions and on cash dividends received on Company common stock. Vesting in Employer Contributions is based on a participant’s number of Years of Service. Employer Contributions to the 401(k) Plan charged to income in fiscal 2018, 2017 and 2016 totaled $8.0 million , $7.8 million and $7.0 million , respectively, and were made through the issuance of new shares of Company common stock and the use of forfeited shares within the 401(k) Plan. Information concerning share-based activity pertaining to the 401(k) Plan for each of the last three fiscal years ended October 31 is as follows (in thousands): Common Stock Class A Common Stock Shares available for issuance as of October 31, 2015 28 28 Shares registered for issuance to the 401(k) Plan 586 586 Issuance of common stock to the 401(k) Plan (123 ) (123 ) Shares available for issuance as of October 31, 2016 491 491 Issuance of common stock to the 401(k) Plan (93 ) (93 ) Shares available for issuance as of October 31, 2017 398 398 Issuance of common stock to the 401(k) Plan (65 ) (65 ) Shares available for issuance as of October 31, 2018 333 333 As previously mentioned in Note 1, Summary of Significant Accounting Policies, the Company acquired a frozen qualified defined benefit pension plan (the "Plan") in connection with a prior year acquisition. Changes in the Plan's projected benefit obligation and plan assets during fiscal 2018 and 2017 are as follows (in thousands): Change in projected benefit obligation: Projected benefit obligation as of October 31, 2016 $14,511 Actuarial gain (156 ) Interest cost 561 Benefits paid (916 ) Projected benefit obligation as of October 31, 2017 14,000 Actuarial gain (749 ) Interest cost 539 Benefits paid (900 ) Projected benefit obligation as of October 31, 2018 $12,890 Change in plan assets: Fair value of plan assets as of October 31, 2016 $10,510 Actual return on plan assets 1,048 Employer contributions 428 Benefits paid (916 ) Fair value of plan assets as of October 31, 2017 11,070 Actual return on plan assets (151 ) Employer contributions 360 Benefits paid (900 ) Fair value of plan assets as of October 31, 2018 $10,379 Funded status as of October 31, 2017 ($2,930 ) Funded status as of October 31, 2018 ($2,511 ) The $2.5 million and $2.9 million difference between the projected benefit obligation and fair value of plan assets as of October 31, 2018 and October 31, 2017, respectively, is included in other long-term liabilities within the Company's Consolidated Balance Sheets. Additionally, the Plan experienced a $.1 million unrealized loss during fiscal 2018 and a $.5 million unrealized gain during fiscal 2017, that were recognized in other comprehensive income (loss) and reported net of less than $.1 million and $.2 million of tax in fiscal 2018 and 2017, respectively. The total unrealized loss in accumulated other comprehensive loss that has yet to be recognized as a component of net periodic pension income (expense) as of October 31, 2018 is $1.8 million (pre-tax). Weighted average assumptions used to determine the projected benefit obligation are as follows: As of October 31, 2018 2017 Discount rate 4.49 % 3.98 % Weighted average assumptions used to determine net pension income are as follows: Year ended October 31, 2018 2017 2016 Discount rate 3.98 % 3.99 % 4.47 % Expected return on plan assets 6.75 % 6.75 % 6.75 % The discount rate used to determine the projected benefit obligation was determined using the results of a bond yield curve model based on a portfolio of high-quality bonds matching expected Plan benefit payments. The expected return on Plan assets was based upon the target asset allocation and investment return estimates for the Plan's equity and fixed income securities. In establishing this assumption, the Company considers many factors including both the historical rate of return and projected inflation-adjusted real rate of return on the Plan's various asset classes and the expected working lifetime for Plan participants. Components of net pension income that were recorded within the Company's Consolidated Statements of Operations are as follows (in thousands): Year ended October 31, 2018 2017 2016 Expected return on plan assets $728 $688 $702 Less: Interest cost (539 ) (561 ) (613 ) Less: Amortization of unrealized loss (17 ) (46 ) — Net pension income $172 $81 $89 The Company anticipates making contributions of $1.0 million to the Plan during fiscal 2019. Estimated future benefit payments to be made during each of the next five fiscal years and in aggregate during the succeeding five fiscal years are as follows (in thousands): Year ending October 31, 2019 $930 2020 929 2021 897 2022 877 2023 869 2024-2028 4,329 The fair value of the Plan's assets are set forth by level within the fair value hierarchy in the following tables (in thousands): As of October 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fixed income securities $5,276 $— $— $5,276 Equity securities 5,006 — — 5,006 Money market funds and cash 97 — — 97 $10,379 $— $— $10,379 As of October 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fixed income securities $5,382 $— $— $5,382 Equity securities 5,593 — — 5,593 Money market funds and cash 95 — — 95 $11,070 $— $— $11,070 Fixed income securities consist of investments in mutual funds. Equity securities consist of investments in common stocks, mutual funds and exchange traded funds. The Plan's actual and targeted asset allocations by investment category are as follows: As of October 31, 2018 2017 Actual Target Actual Target Fixed income securities 51 % 50 % 49 % 50 % Equity securities 48 % 50 % 50 % 50 % Money market funds and cash 1 % — % 1 % — % 100 % 100 % 100 % 100 %

REDEEMABLE NONCONTROLLING INTER

REDEEMABLE NONCONTROLLING INTERESTS	12 Months Ended
	Oct. 31, 2018
Temporary Equity Redeemable Noncontrolling Interests [Abstract]
Temporary Equity Redeemable Noncontrolling Interests [Text Block]	REDEEMABLE NONCONTROLLING INTERESTS The holders of equity interests in certain of the Company’s subsidiaries have rights (“Put Rights”) that may be exercised on varying dates causing the Company to purchase their equity interests through fiscal 2025. The Put Rights, all of which relate either to common shares or membership interests in limited liability companies, provide that the cash consideration to be paid for their equity interests (the “Redemption Amount”) be at fair value or at a formula that management intended to reasonably approximate fair value based solely on a multiple of future earnings over a measurement period. As of October 31, 2018, management’s estimate of the aggregate Redemption Amount of all Put Rights that the Company could be required to pay is approximately $132.0 million . The actual Redemption Amount will likely be different. The aggregate Redemption Amount of all Put Rights was determined using probability adjusted internal estimates of future earnings of the Company’s subsidiaries with Put Rights while considering the earliest exercise date, the measurement period and any applicable fair value adjustments. The portion of the estimated Redemption Amount as of October 31, 2018 redeemable at fair value is approximately $83.5 million and the portion redeemable based solely on a multiple of future earnings is approximately $48.5 million . A summary of the Put Rights associated with the redeemable noncontrolling interests in certain of the Company’s subsidiaries as of October 31, 2018 is as follows: Subsidiary Operating Company Earliest Purchase 2005 ETG 95.9% 2019 (1) 4 (2) 2006 FSG 80.1% 2019 (1) 4 2008 FSG 82.3% 2019 (1) 5 2009 ETG 82.5% 2019 (1) 1 2012 ETG 78.0% 2019 (1) 2 2012 FSG 84.0% 2019 (1) 4 2012 FSG 80.1% 2019 (1) 4 2015 FSG 80.0% 2019 4 2015 FSG 80.1% 2020 4 2015 ETG 80.1% 2020 2 2015 FSG 80.1% 2022 4 2017 FSG 80.1% 2022 2 (3) 2018 ETG 85.0% 2021 1 (1) Currently puttable (2) A portion is to be purchased in a lump sum (3) The second purchase is to be made two years after the first Put Right Year The estimated aggregate Redemption Amount of the Put Rights that are currently puttable or becoming puttable during fiscal 2019 is approximately $61.3 million , of which approximately $27.7 million would be payable in fiscal 2019 should all of the eligible associated noncontrolling interest holders elect to exercise their Put Rights during fiscal 2019. Additionally, the Company has call rights to purchase the equity interests of the noncontrolling holders over the same purchase period as the Put Rights. During fiscal 2016, the holders of a 19.9% noncontrolling equity interest in a subsidiary of the FSG that was acquired in fiscal 2011 exercised their option to cause the Company to purchase their interests over a two-year period ending in fiscal 2017. Accordingly, the Company’s ownership interest in the subsidiary increased to 100% effective March 2017. The $3.8 million and $3.6 million

NET INCOME PER SHARE ATTRIBUTAB

NET INCOME PER SHARE ATTRIBUTABLE TO HEICO SHAREHOLDERS	12 Months Ended
	Oct. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	NET INCOME PER SHARE ATTRIBUTABLE TO HEICO SHAREHOLDERS The computation of basic and diluted net income per share attributable to HEICO shareholders is as follows (in thousands, except per share data): Year ended October 31, 2018 2017 2016 Numerator: Net income attributable to HEICO $259,233 $185,985 $156,192 Denominator: Weighted average common shares outstanding - basic 132,543 131,703 130,948 Effect of dilutive stock options 4,153 3,885 2,197 Weighted average common shares outstanding - diluted 136,696 135,588 133,145 Net income per share attributable to HEICO shareholders: Basic $1.96 $1.41 $1.19 Diluted $1.90 $1.37 $1.17 Anti-dilutive stock options excluded 512 799 1,133

QUARTERLY FINANCIAL INFORMATION

QUARTERLY FINANCIAL INFORMATION (UNAUDITED)	12 Months Ended
	Oct. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information [Text Block]	QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (in thousands, except per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Net sales: 2018 $404,410 $430,602 $465,825 $476,884 2017 $343,432 $368,657 $391,500 $421,224 Gross profit: 2018 $154,791 $167,857 $181,609 $186,458 2017 $125,417 $140,382 $148,897 $160,029 Net income from consolidated operations: 2018 $71,695 $66,011 $73,899 $74,081 2017 $46,265 $50,833 $51,475 $59,087 Net income attributable to HEICO: 2018 $65,152 $59,618 $67,086 $67,377 2017 $40,927 $45,686 $45,698 $53,674 Net income per share attributable to HEICO: Basic: 2018 $.49 $.45 $.51 $.51 2017 $.31 $.35 $.35 $.41 Diluted: 2018 $.48 $.44 $.49 $.49 2017 $.30 $.34 $.34 $.39 During the first quarter of fiscal 2018, the U.S. government enacted significant changes to existing tax law resulting in the Company recording a provisional discrete tax benefit from remeasuring its U.S. federal net deferred tax liabilities that was partially offset by a provisional discrete tax expenses related to a one-time transition tax on the unremitted earnings of the Company's foreign subsidiaries. The net impact of these provisional amounts increased net income attributable to HEICO by $11.9 million , or $.09 per basic and dilute share. See Note 6, Income Taxes, for additional information regarding changes to existing tax law. During the first quarter of fiscal 2017, the Company adopted ASU 2016-09, resulting in the recognition of a $3.1 million discrete income tax benefit and a 1,220,000 increase in the Company's weighted average number of diluted common shares outstanding, which, net of noncontrolling interests, increased net income attributable to HEICO by $2.6 million , or $.02 per basic and $.01 per diluted share.

OPERATING SEGMENTS

OPERATING SEGMENTS	12 Months Ended
	Oct. 31, 2018
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	OPERATING SEGMENTS The Company has two operating segments: the Flight Support Group (“FSG”), consisting of HEICO Aerospace and HEICO Flight Support Corp. and their collective subsidiaries; and the Electronic Technologies Group (“ETG”), consisting of HEICO Electronic and its subsidiaries. The Company's operating segment reporting structure is consistent with how management reviews the business, makes investing and resource decisions and assesses operating performance. Additionally, characteristics such as similarity of products, customers, economic characteristics and various other factors are considered when identifying the Company's operating segments. The FSG designs, manufactures, repairs, overhauls and distributes jet engine and aircraft component replacement parts. The parts and services are approved by the FAA. The FSG also manufactures and sells specialty parts as a subcontractor for aerospace and industrial original equipment manufacturers and the U.S. government. Additionally, the FSG is a leading supplier, distributor, and integrator of military aircraft parts and support services primarily to foreign military organizations allied with the U.S. and is a leading manufacturer of advanced niche components and complex composite assemblies for commercial aviation, defense and space applications. Further, the FSG engineers, designs and manufactures thermal insulation blankets and parts and is a leading distributor of aviation electrical interconnect products and electromechanical parts. The ETG collectively designs and manufactures electronic, microwave, and electro-optical equipment and components, three-dimensional microelectronic and stacked memory products, high-speed interface products, high voltage interconnection devices, high voltage advanced power electronics products, power conversion products, underwater locator beacons, emergency locator transmission beacons, electromagnetic interference shielding, traveling wave tube amplifiers, harsh environment electronic connectors and other interconnect products, communications and electronic intercept receivers and tuners, crashworthy and ballistically self-sealing auxiliary fuel systems for military rotorcraft, radio frequency (RF) and microwave amplifiers, transmitters and receivers, satellite microwave modules and integrated subsystems and high performance active antenna systems primarily for the aviation, defense, space, medical, telecommunications and electronics industries. The Company’s reportable operating segments offer distinctive products and services that are marketed through different channels. They are managed separately because of their unique technology and service requirements. Segment Profit or Loss The accounting policies of the Company’s operating segments are the same as those described in Note 1, Summary of Significant Accounting Policies. Management evaluates segment performance based on segment operating income. Information on the Company’s two operating segments, the FSG and the ETG, for each of the last three fiscal years ended October 31 is as follows (in thousands): Segment Other, Primarily Corporate and Intersegment (1) Consolidated Totals FSG ETG Year ended October 31, 2018: Net sales $1,097,937 $701,827 ($22,043 ) $1,777,721 Depreciation 13,322 9,225 692 23,239 Amortization 19,530 33,339 1,083 53,952 Operating income 206,623 204,508 (34,886 ) 376,245 Capital expenditures 13,074 9,531 19,266 41,871 Total assets 1,093,858 1,391,997 167,541 2,653,396 Year ended October 31, 2017: Net sales $967,540 $574,261 ($16,988 ) $1,524,813 Depreciation 13,042 8,609 227 21,878 Amortization 18,026 24,167 752 42,945 Operating income 179,278 157,451 (30,071 ) 306,658 Capital expenditures 15,665 10,100 233 25,998 Total assets 1,042,925 1,339,363 130,143 2,512,431 Year ended October 31, 2016: Net sales $875,870 $511,272 ($10,884 ) $1,376,258 Depreciation 12,113 8,030 218 20,361 Amortization 16,590 22,664 662 39,916 Operating income 163,427 126,031 (24,113 ) 265,345 Capital expenditures 18,434 11,962 467 30,863 Total assets 877,672 1,015,696 105,044 1,998,412 (1) Intersegment activity principally consists of net sales from the ETG to the FSG. The following table summarizes the Company’s net sales to external customers by product lines included in each operating segment (in thousands): Year ended October 31, 2018 2017 2016 Flight Support Group: Aftermarket replacement parts (1) $582,562 $489,644 $405,108 Repair and overhaul parts and services (2) 286,454 270,482 251,357 Specialty products (3) 228,921 207,414 219,405 Total net sales 1,097,937 967,540 875,870 Electronic Technologies Group: Electronic component parts for defense, space and aerospace equipment (4) 547,088 420,991 371,297 Electronic component parts for equipment in various other industries (5) 154,739 153,270 139,975 Total net sales 701,827 574,261 511,272 Other, primarily corporate and intersegment (22,043 ) (16,988 ) (10,884 ) Total consolidated net sales $1,777,721 $1,524,813 $1,376,258 (1) Includes various jet engine and aircraft component replacement parts. (2) Includes primarily the sale of parts consumed in various repair and overhaul services on selected jet engine and aircraft components, avionics, instruments, composites and flight surfaces of commercial and military aircraft. (3) Includes primarily the sale of specialty components such as thermal insulation blankets, renewable/reusable insulation systems, advanced niche components, complex composite assemblies, and expanded foil mesh. (4) Includes various component parts such as electro-optical infrared simulation and test equipment, electro-optical laser products, electro-optical, microwave and other power equipment, high-speed interface products, power conversion products, underwater locator beacons, emergency locator transmission beacons, traveling wave tube amplifiers, microwave power modules, three-dimensional microelectronic and stacked memory products, crashworthy and ballistically self-sealing auxiliary fuel systems, radio frequency (RF) and microwave amplifiers, transmitters and receivers, high performance communications and electronic intercept receivers and tuners and high performance active antenna systems. (5) Includes various component parts such as electromagnetic and radio interference shielding, high voltage interconnection devices, high voltage advanced power electronics, harsh environment connectivity products and custom molded cable assemblies. Major Customer and Geographic Information The Company markets its products and services in approximately 115 countries. The following table summarizes the Company’s net sales to customers located in the United States and to those in other countries for each of the last three fiscal years ended October 31 (in thousands). Net sales are attributed to countries based on the location of the customer. Net sales to any one customer or originating from any one foreign country did not account for 10% or more of the Company’s consolidated net sales during any of the last three fiscal years. The following table also summarizes the Company’s long-lived assets held within and outside of the United States as of October 31 of the last three fiscal years (in thousands). Long-lived assets consist of net property, plant and equipment. 2018 2017 2016 Net Sales: United States of America $1,127,998 $1,007,491 $904,670 Other countries 649,723 517,322 471,588 Total net sales $1,777,721 $1,524,813 $1,376,258 Long-lived assets: United States of America $124,225 $97,367 $94,889 Other countries 30,514 32,516 26,722 Total long-lived assets $154,739 $129,883 $121,611

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Oct. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	COMMITMENTS AND CONTINGENCIES Lease Commitments The Company leases certain property and equipment, including manufacturing facilities and office equipment under operating leases. Some of these leases provide the Company with the option after the initial lease term either to purchase the property at the then fair market value or renew the lease at the then fair rental value. Generally, management expects that leases will be renewed or replaced by other leases in the normal course of business. Future minimum payments under non-cancelable operating leases for the next five fiscal years and thereafter are estimated to be as follows (in thousands): Year ending October 31, 2019 $14,961 2020 14,991 2021 14,147 2022 12,546 2023 7,334 Thereafter 18,007 Total minimum lease commitments $81,986 Total rent expense charged to operations for operating leases in fiscal 2018, 2017 and 2016 amounted to $17.5 million , $15.6 million and $14.7 million , respectively. Guarantees As of October 31, 2018, the Company has arranged for standby letters of credit aggregating $4.3 million , which are supported by its revolving credit facility and pertain to payment guarantees related to potential workers' compensation claims and a facility lease as well as performance guarantees related to customer contracts entered into by certain of the Company's subsidiaries. Product Warranty Changes in the Company’s product warranty liability in fiscal 2018 and 2017 are as follows (in thousands): Year ended October 31, 2018 2017 Balances as of beginning of year $2,921 $3,351 Accruals for warranties 2,720 2,254 Acquired warranty liabilities 320 — Warranty claims settled (2,655 ) (2,684 ) Balances as of end of year $3,306 $2,921 Litigation

SUPPLEMENTAL DISCLOSURES OF CAS

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION	12 Months Ended
	Oct. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Cash Flow, Supplemental Disclosures [Text Block]	SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION The following table presents supplemental disclosures of cash flow information and non-cash investing activities for fiscal 2018, 2017 and 2016 (in thousands): Year ended October 31, 2018 2017 2016 Cash paid for income taxes $90,488 $95,851 $87,486 Cash received from income tax refunds (1,510 ) (2,953 ) (1,906 ) Cash paid for interest 19,233 9,631 8,288 Contingent consideration — 13,797 1,225 Additional purchase consideration (407 ) 220 — Property, plant and equipment acquired through capital lease obligations 7,166 37 1,111

SUBSEQUENT EVENT SUBSEQUENT EVE

SUBSEQUENT EVENT SUBSEQUENT EVENT (Notes)	12 Months Ended
	Oct. 31, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS In November 2018, the Company, through HEICO Electronic, acquired all of the stock of Specialty Silicone Products, Inc. ("SSP"). SSP designs and manufactures silicone material for a variety of demanding applications, used in aerospace, defense, research, oil and gas, testing, pharmaceuticals and other markets. The purchase price of this acquisition was paid in cash principally using proceeds from the Company's revolving credit facility and the total consideration for the acquisition is not material or significant to the Company’s consolidated financial statements. In November 2018, the Company, through HEICO Electronic, acquired 93% of the stock of Apex Micotechnology, Inc. ("Apex"). Apex designs and manufactures precision power analog monolithic, hybrid and open frame components for a certain wide range of aerospace, defense, industrial, measurement, medical and test applications. The purchase price of this acquisition was paid in cash using proceeds from the Company's revolving credit facility and the total consideration for the acquisition is not material or significant to the Company’s consolidated financial statements.

VALUATION AND QUALIFYING ACCOUN

VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Oct. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS Year ended October 31, 2018 2017 2016 Allowance for doubtful accounts (in thousands): Allowance as of beginning of year $3,006 $3,159 $2,038 Additions charged to costs and expenses 492 7 390 Additions (credited) charged to other accounts (a) (13 ) 298 973 Deductions (b) (227 ) (458 ) (242 ) Allowance as of end of year $3,258 $3,006 $3,159 (a) Principally additions from acquisitions and foreign currency translation adjustments. (b) Principally write-offs of uncollectible accounts receivable, net of recoveries. Year ended October 31, 2018 2017 2016 Inventory valuation reserves (in thousands): Reserves as of beginning of year $92,148 $81,449 $69,654 Additions charged to costs and expenses 9,227 6,284 10,270 Additions charged to other accounts (a) 1,270 6,264 6,268 Deductions (b) (7,254 ) (1,849 ) (4,743 ) Reserves as of end of year $95,391 $92,148 $81,449 (a) Principally additions from acquisitions and foreign currency translation adjustments. (b)

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Oct. 31, 2018
Summary Of Significant Accounting Policies (Policies) [Abstract]
Nature Of Business, Policy [Policy Text Block]	Nature of Business
Basis Of Presentation, Policy [Policy Text Block]	Basis of Presentation The Company has two operating segments: the Flight Support Group (“FSG”), consisting of HEICO Aerospace and HEICO Flight Support Corp. and their respective subsidiaries; and the Electronic Technologies Group (“ETG”), consisting of HEICO Electronic and its subsidiaries. The consolidated financial statements include the financial accounts of HEICO Corporation and its subsidiaries, all of which are wholly owned except for HEICO Aerospace, which is 20% owned by Lufthansa Technik AG ("LHT"), the technical services subsidiary of Lufthansa German Airlines. In addition, HEICO Aerospace consolidates two subsidiaries which are 80.1% and 82.3% owned, respectively, and a joint venture, which is 84% owned. Also, HEICO Flight Support Corp. consolidates two subsidiaries which are 80% and 84% , owned, respectively, and four subsidiaries that are each 80.1% owned. Furthermore, HEICO Electronic consolidates four subsidiaries, which are 80.1% , 80.1% , 82.5% , and 95.9% owned, respectively. Additionally, a wholly owned subsidiary of HEICO Electronic consolidates two subsidiaries which are 78% and 85% owned, respectively, while an 82.5% owned subsidiary of HEICO Electronic consolidates a subsidiary in which it has a 53.1%
Stock Split [Policy Text Block]	Stock Splits In June 2018, December 2017 and March 2017, the Company's Board of Directors declared a 5-for-4 stock split on both classes of the Company's common stock. The stock splits were effected as of June 28, 2018, January 18, 2018 and April 19, 2017, respectively, in the form of a 25%
Use of Estimates and Assumptions, Policy [Policy Text Block]	Use of Estimates and Assumptions
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents For purposes of the consolidated financial statements, the Company considers all highly liquid investments such as U.S. Treasury bills and money market funds, without liquidity fees or redemption gates, with an original maturity of three months or less at the time of purchase to be cash equivalents.
Accounts Receivable, Policy [Policy Text Block]	Accounts Receivable
Concentrations Of Credit Risk, Policy [Policy Text Block]	Concentrations of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of temporary cash investments and trade accounts receivable. The Company places its temporary cash investments with high credit quality financial institutions and limits the amount of credit exposure to any one financial institution. Concentrations of credit risk with respect to trade receivables are limited due to the large number of customers comprising the Company’s customer base and their dispersion across many different geographical regions. The Company performs ongoing credit evaluations of its customers, but does not generally require collateral to support customer receivables.
Inventory, Policy [Policy Text Block]	Inventory Inventory is stated at the lower of cost or net realizable value, with cost being determined on the first-in, first-out or the average cost basis. Losses, if any, are recognized fully in the period when identified. The Company periodically evaluates the carrying value of inventory, giving consideration to factors such as its physical condition, sales patterns and expected future demand in order to estimate the amount necessary to write down any slow moving, obsolete or damaged inventory.
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Policy [Policy Text Block]	Property, Plant and Equipment Property, plant and equipment is recorded at cost. Depreciation and amortization is generally provided on the straight-line method over the estimated useful lives of the various assets. The Company’s property, plant and equipment is generally depreciated over the following estimated useful lives: Buildings and improvements 10 to 40 years Machinery and equipment 3 to 10 years Leasehold improvements 2 to 20 years Tooling 2 to 5 years The costs of major additions and improvements are capitalized. Leasehold improvements are amortized over the shorter of the leasehold improvement’s useful life or the lease term. Repairs and maintenance costs are expensed as incurred. Upon an asset's disposition, its cost and related accumulated depreciation are removed from the financial accounts and any resulting gain or loss is reflected within earnings.
Business Combinations, Policy [Policy Text Block]	Business Combinations The Company allocates the purchase price of acquired entities to the underlying tangible and identifiable intangible assets acquired and liabilities and any noncontrolling interests assumed based on their estimated fair values, with any excess recorded as goodwill. The operating results of acquired businesses are included in the Company’s results of operations beginning as of their effective acquisition dates. Acquisition costs are generally expensed as incurred, were not material in fiscal 2018 or 2017 and totaled $3.2 million in fiscal 2016. See Note 2, Acquisitions, for additional information regarding fiscal 2016 acquisition costs.
Goodwill and Other Intangible Assets, Policy [Policy Text Block]	Goodwill and Other Intangible Assets The Company tests goodwill for impairment annually as of October 31, or more frequently if events or changes in circumstances indicate that the carrying amount of goodwill may not be fully recoverable. In evaluating the recoverability of goodwill, the Company compares the fair value of each of its reporting units to its carrying value to determine potential impairment. If the carrying value of a reporting unit exceeds its fair value, the implied fair value of that reporting unit’s goodwill is to be calculated and an impairment loss is recognized in the amount by which the carrying value of the reporting unit’s goodwill exceeds its implied fair value, if any. The fair values of the Company's reporting units are determined by using a weighted average of a market approach and an income approach. Under the market approach, fair values are estimated using published market multiples for comparable companies. The Company calculates fair values under the income approach by taking estimated future cash flows that are based on internal projections and other assumptions deemed reasonable by management and discounting them using an estimated weighted average cost of capital. The Company’s intangible assets not subject to amortization consist principally of its trade names. The Company’s intangible assets subject to amortization are amortized on the straight-line method (except for certain customer relationships amortized on an accelerated method) over the following estimated useful lives : Customer relationships 4 to 15 years Intellectual property 4 to 22 years Licenses 10 to 17 years Patents 5 to 20 years Trade names 8 to 15 years Amortization expense of intellectual property, licenses and patents is recorded as a component of cost of sales, and amortization expense of customer relationships, non-compete agreements and trade names is recorded as a component of selling, general and administrative ("SG&A") expenses in the Company’s Consolidated Statements of Operations. The Company tests each non-amortizing intangible asset for impairment annually as of October 31, or more frequently if events or changes in circumstances indicate that the asset might be impaired. To derive the fair value of its trade names, the Company utilizes an income approach, which relies upon management's assumptions of royalty rates, projected revenues and discount rates. The Company also tests each amortizing intangible asset for impairment if events or circumstances indicate that the asset might be impaired. The test consists of determining whether the carrying value of such assets will be recovered through undiscounted expected future cash flows. If the total of the undiscounted future cash flows is less than the carrying amount of those assets, the Company recognizes an impairment loss based on the excess of the carrying amount over the fair value of the assets. The determination of fair value requires management to make a number of estimates, assumptions and judgments of such factors as projected revenues and earnings and discount rates.
Investments, Policy [Policy Text Block]	Investments
Customer Rebates and Credits, Policy [Policy Text Block]	Customer Rebates and Credits
Product Warranties, Policy [Policy Text Block]	Product Warranties
Defined Benefit Pension Plan, Policy [Policy Text Block]	Defined Benefit Pension Plan In connection with a prior year acquisition, the Company assumed a frozen qualified defined benefit pension plan (the "Plan"). The Plan's benefits are based on employee compensation and years of service; however, the accrued benefit for Plan participants was fixed as of the date of acquisition. The Company uses an actuarial valuation to determine the projected benefit obligation of the Plan and records the difference between the fair value of the Plan's assets and the projected benefit obligation as of October 31 in its Consolidated Balance Sheets. Additionally, any actuarial gain or loss that arises during a fiscal year that is not recognized as a component of net periodic pension income or expense is recorded as a component of other
Revenue Recognition, Policy [Policy Text Block]	Revenue Recognition Revenue from the sale of products and the rendering of services is recognized when title and risk of loss passes to the customer, which is generally at the time of shipment. Revenue from the rendering of services represented less than 10% of consolidated net sales for all periods presented. Revenue from certain fixed price contracts for which costs can be dependably estimated is recognized on the percentage-of-completion method, measured by the percentage of costs incurred to date to estimated total costs for each contract. The percentage of the Company’s net sales recognized under the percentage-of-completion method was approximately 2% , 3% and 3% in fiscal 2018, 2017 and 2016, respectively. Contract costs include all direct material and labor costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and depreciation costs. SG&A costs are charged to expense as incurred. Revisions in cost estimates as contracts progress have the effect of increasing or decreasing profits in the period of revision. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined. Variations in actual labor performance, changes to estimated profitability, and final contract settlements may result in revisions to cost estimates and are recognized in income in the period in which the revisions are determined. Changes in estimates pertaining to percentage-of-completion contracts did not have a material effect on net income from consolidated operations in fiscal 2018, 2017 or 2016. The asset, “costs and estimated earnings in excess of billings” on uncompleted percentage-of-completion contracts, included in accounts receivable, represents revenue recognized in excess of amounts billed. The liability, “billings in excess of costs and estimated earnings,” included in accrued expenses and other current liabilities, represents billings in excess of revenue recognized on contracts accounted for under the percentage-of-completion method. Billings are made based on the completion of certain milestones as provided for in the contracts. For fixed price contracts in which costs cannot be dependably estimated, revenue is recognized on the completed-contract method. A contract is considered complete when all significant costs have been incurred or the item has been accepted by the customer. Progress billings and customer advances (“billings to date”) received on fixed price contracts accounted for under the completed-contract method are classified as a reduction to contracts in process (a component of inventories), if any, and any remaining amount is included in accrued expenses and other current liabilities. Effective as of the beginning of the first quarter of fiscal 2019, the Company will adopt Accounting Standards Update ("ASU") 2014-09, “Revenue from Contracts with Customers,” which will impact the timing of revenue recognition for two types of the Company's customer contracts. See “New Accounting Pronouncements,” below for additional information.
Stock-Based Compensation, Policy [Policy Text Block]	Stock-Based Compensation The Company records compensation expense associated with stock options in its Consolidated Statements of Operations based on the grant date fair value of those awards. The fair value of each stock option on the date of grant is estimated using the Black-Scholes pricing model based on certain valuation assumptions. Expected stock price volatility is based on the Company’s historical stock prices over the contractual term of the option grant and other factors. The risk-free interest rate used is based on the published U.S. Treasury yield curve in effect at the time of the option grant for instruments with a similar life. The dividend yield reflects the Company’s expected dividend yield at the date of grant. The expected option life represents the period of time that the stock options are expected to be outstanding, taking into consideration the contractual term of the option grant and employee historical exercise behavior. The Company generally recognizes stock option compensation expense ratably over the award’s vesting period.
Income Taxes, Policy [Policy Text Block]	Income Taxes
Redeemable Noncontrolling Interests, Policy [Policy Text Block]	Redeemable Noncontrolling Interests As further detailed in Note 11, Redeemable Noncontrolling Interests, the holders of equity interests in certain of the Company’s subsidiaries have rights (“Put Rights”) that require the Company to provide cash consideration for their equity interests (the “Redemption Amount”) at fair value or at a formula that management intended to reasonably approximate fair value based solely on a multiple of future earnings over a measurement period. The Put Rights are embedded in the shares owned by the noncontrolling interest holders and are not freestanding. The Company tracks the carrying cost of such redeemable noncontrolling interests at historical cost plus an allocation of subsidiary earnings based on ownership interest, less dividends paid to the noncontrolling interest holders. Redeemable noncontrolling interests are recorded outside of permanent equity at the higher of their carrying cost or management’s estimate of the Redemption Amount. The initial adjustment to record redeemable noncontrolling interests at the Redemption Amount results in a corresponding decrease to retained earnings. Subsequent adjustments to the Redemption Amount of redeemable noncontrolling interests may result in corresponding decreases or increases to retained earnings, provided any increases to retained earnings may only be recorded to the extent of decreases previously recorded. Adjustments to Redemption Amounts based on fair value will have no effect on net income per share attributable to HEICO shareholders whereas the portion of periodic adjustments to the carrying amount of redeemable noncontrolling interests based solely on a multiple of future earnings that reflect a
Net Income per Share Attributable to HEICO Shareholders, Policy [Policy Text Block]	Net Income per Share Attributable to HEICO Shareholders
Foreign Currency Translation, Policy [Policy Text Block]	Foreign Currency All assets and liabilities of foreign subsidiaries that do not utilize the U.S. dollar as its functional currency are translated at period-end exchange rates, while revenue and expenses are translated using average exchange rates for the period. Unrealized translation gains or losses are reported as foreign currency translation adjustments through other comprehensive income or (loss) in shareholders’ equity. Transaction gains or losses related to balances denominated in a currency other than the functional currency are recorded in the Company's Consolidated Statements of Operations.
Contingencies, Policy [Policy Text Block]	Contingencies
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, which provides a comprehensive new revenue recognition model that will supersede nearly all existing revenue recognition guidance. Under ASU 2014-09, an entity will recognize revenue when it transfers promised goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. The guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. ASU 2014-09, as amended, is effective for fiscal years and interim reporting periods within those years beginning after December 15, 2017, or in fiscal 2019 for HEICO. ASU 2014-09 shall be applied either retrospectively to each prior reporting period presented (“full retrospective method”) or retrospectively with the cumulative effect of initially applying ASU 2014-09 recognized at the date of initial application (“modified retrospective method”). The Company has completed a review of its customer contracts and has evaluated the impact of ASU 2014-09 on each of its primary revenue streams. While the Company finalizes its overall assessment of the amended guidance, the most significant impact relates to the timing of revenue recognition, presentation and disclosures. ASU 2014-09 will impact the timing of revenue recognition for two types of the Company’s customer contracts. For certain contracts under which it produces products with no alternative use and for which the Company has an enforceable right to payment during the production cycle and for certain other contracts under which the Company creates or enhances customer-owned assets while performing repair and overhaul services, ASU 2014-09 will require HEICO to recognize revenue using an over-time recognition model as opposed to the Company’s current policy of recognizing revenue at the time of shipment. For impacted customer contracts, the adoption of ASU 2014-09 will accelerate revenue recognition and the associated cost of sales. Effective as of the beginning of the first quarter of fiscal 2019, the Company will adopt ASU 2014-09 using the modified retrospective method and recognize a cumulative effect adjustment to retained earnings based on any open contracts at that time for which revenue recognition has changed from a point-in-time recognition model to an over-time recognition model. While the ongoing impact to net sales and net income is not expected to be material to the Company’s consolidated results of operations, the future impact of ASU 2014-09 is dependent on the mix and nature of specific customer contracts. The Company is nearing completion of implementing changes to its business processes, systems and controls needed to support recognition and disclosure requirements under ASU 2014-09. In July 2015, the FASB issued ASU 2015-11, "Simplifying the Measurement of Inventory,” which requires entities to measure inventories at the lower of cost or net realizable value. Previously, inventories were measured at the lower of cost or market. The Company adopted ASU 2015-11 in the first quarter of fiscal 2018, resulting in no material effect on the Company's consolidated results of operations, financial position or cash flows. In February 2016, the FASB issued ASU 2016-02, “Leases," which requires recognition of lease assets and lease liabilities on the balance sheet of lessees. ASU 2016-02 is effective for fiscal years and interim reporting periods within those years beginning after December 15, 2018, or in fiscal 2020 for HEICO. Early adoption is permitted. ASU 2016-02, as amended, provides certain optional transition relief and shall be applied either at the beginning of the earliest comparative period presented in the year of adoption using a modified retrospective transition approach or by recognizing a cumulative effect adjustment at the date of adoption. The Company is currently evaluating the effect the adoption of this guidance will have on its consolidated results of operations, financial position and cash flows. In August 2016, the FASB issued ASU 2016-15, "Classification of Certain Cash Receipts and Cash Payments," which clarifies how certain cash receipts and cash payments are to be presented and classified in the statement of cash flows. The Company adopted ASU 2016-15 on a retrospective basis in the fourth quarter of fiscal 2018, which requires that proceeds from corporate-owned life insurance policies be classified as cash inflows from investing activities. Such proceeds aggregated $.1 million over the past three fiscal years and were all received in fiscal 2016. In addition, and as permitted by ASU 2016-15, the Company has elected to classify investments related to the HEICO Corporation Leadership Compensation Plan as cash outflows from investing activities as such investments primarily represent premium payments on corporate-owned life insurance policies. The adoption of ASU 2016-15 resulted in an $11.5 million , $13.4 million and $10.5 million increase in cash provided by operating activities and in cash used in investing activities in fiscal 2018, 2017 and fiscal 2016, respectively.
Assets Held under Capital Leases [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Policy [Policy Text Block]	Capital Leases

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Oct. 31, 2018
Summary Of Significant Accounting Policies (Details) [Abstract]
Property, Plant and Equipment [Table Text Block]	The Company’s property, plant and equipment is generally depreciated over the following estimated useful lives: Buildings and improvements 10 to 40 years Machinery and equipment 3 to 10 years Leasehold improvements 2 to 20 years Tooling 2 to 5 years
Intangible Assets Useful Life [Table Text Block]	The Company’s intangible assets subject to amortization are amortized on the straight-line method (except for certain customer relationships amortized on an accelerated method) over the following estimated useful lives : Customer relationships 4 to 15 years Intellectual property 4 to 22 years Licenses 10 to 17 years Patents 5 to 20 years Trade names 8 to 15 years

ACQUISITIONS (Tables)

ACQUISITIONS (Tables)	12 Months Ended
	Oct. 31, 2018
Business Acquisition [Line Items]
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	The following table summarizes the weighted average amortization period of the definite-lived intangible assets acquired in connection with the Company's other fiscal 2018, 2017 and 2016 acquisitions (in years): Year ended October 31, 2018 2017 2016 Customer relationships 7 12 11 Trade names — — 15 Intellectual property 10 13 15
Other Acquisitions [Member]
Business Acquisition [Line Items]
Schedule of Fair Value of Total Consideration [Table Text Block]	The following table summarizes the aggregate total consideration for the Company's other acquisitions (in thousands): Year ended October 31, 2018 2017 2016 Cash paid $61,931 $109,346 $11,000 Less: cash acquired (4,000 ) (7,713 ) — Cash paid, net 57,931 101,633 11,000 Contingent consideration — — 1,225 Additional purchase consideration (407 ) 1,300 — Total consideration $57,524 $102,933 $12,225
Schedule of Purchase Price Allocation [Table Text Block]	The following table summarizes the allocation of the aggregate total consideration for the Company's other acquisitions to the estimated fair values of the tangible and identifiable intangible assets acquired and liabilities and noncontrolling interests assumed (in thousands): Year ended October 31, 2018 2017 2016 Assets acquired: Goodwill $38,320 $49,932 $6,876 Customer relationships 11,620 29,500 2,800 Trade names 760 16,750 300 Intellectual property 6,970 1,950 2,000 Inventories 6,219 28,410 249 Accounts receivable 1,488 15,165 — Property, plant and equipment 1,807 4,522 — Other assets 51 982 — Total assets acquired, excluding cash 67,235 147,211 12,225 Liabilities assumed: Accounts payable 671 7,696 — Accrued expenses 1,522 6,054 — Deferred income taxes — 5,432 — Other liabilities — 1,434 — Total liabilities assumed 2,193 20,616 — Noncontrolling interests in consolidated subsidiaries 7,518 23,662 — Net assets acquired, excluding cash $57,524 $102,933 $12,225
Electronic Technologies Group [Member] | AAT [Member]
Business Acquisition [Line Items]
Schedule of Fair Value of Total Consideration [Table Text Block]	The following table summarizes the total consideration for the acquisition of AAT (in thousands): Cash paid $317,500 Less: cash acquired (868 ) Cash paid, net 316,632 Contingent consideration 13,797 Additional purchase consideration 544 Total consideration $330,973
Schedule of Purchase Price Allocation [Table Text Block]	The following table summarizes the allocation of the total consideration for the acquisition of AAT to the estimated fair values of the tangible and identifiable intangible assets acquired and liabilities assumed (in thousands): Assets acquired: Goodwill $157,901 Customer relationships 100,000 Intellectual property 39,000 Trade name 20,000 Inventories 8,306 Accounts receivable 6,115 Property, plant and equipment 1,893 Other assets 208 Total assets acquired, excluding cash 333,423 Liabilities assumed: Accounts payable 1,299 Accrued expenses 1,151 Total liabilities assumed 2,450 Net assets acquired, excluding cash $330,973
Schedule of Pro Forma Information [Table Text Block]	The following table presents unaudited pro forma financial information for fiscal 2017 and fiscal 2016 as if the acquisition of AAT had occurred as of November 1, 2015 (in thousands, except per share data): Year ended October 31, 2017 2016 Net sales $1,582,653 $1,428,336 Net income from consolidated operations $220,419 $185,070 Net income attributable to HEICO $198,744 $165,112 Net income per share attributable to HEICO shareholders: Basic $1.51 $1.26 Diluted $1.47 $1.24
Electronic Technologies Group [Member] | Robertson [Member]
Business Acquisition [Line Items]
Schedule of Fair Value of Total Consideration [Table Text Block]	The following table summarizes the total consideration for the acquisition of Robertson (in thousands): Cash paid $256,293 Less: cash acquired (3,271 ) Total consideration $253,022
Schedule of Purchase Price Allocation [Table Text Block]	The following table summarizes the allocation of the total consideration for the acquisition of Robertson to the estimated fair values of the tangible and identifiable intangible assets acquired and liabilities assumed (in thousands): Assets acquired: Goodwill $93,425 Customer relationships 55,100 Intellectual property 39,600 Trade name 28,400 Inventories 27,417 Property, plant and equipment 7,476 Accounts receivable 4,973 Other assets 1,884 Total assets acquired, excluding cash 258,275 Liabilities assumed: Accounts payable 4,606 Accrued expenses 647 Total liabilities assumed 5,253 Net assets acquired, excluding cash $253,022

SELECTED FINANCIAL STATEMENT _2

SELECTED FINANCIAL STATEMENT INFORMATION (Tables)	12 Months Ended
	Oct. 31, 2018
Selected Financial Statement Information [Abstract]
Schedule of Accounts Receivable [Table Text Block]	Accounts Receivable As of October 31, (in thousands) 2018 2017 Accounts receivable $254,727 $225,462 Less: Allowance for doubtful accounts (3,258 ) (3,006 ) Accounts receivable, net $251,469 $222,456
Costs And Estimated Earnings On Uncompleted Percentage Of Completion Contracts [Table Text Block]	Costs and Estimated Earnings on Uncompleted Percentage-of-Completion Contracts As of October 31, (in thousands) 2018 2017 Costs incurred on uncompleted contracts $39,350 $29,491 Estimated earnings 19,708 19,902 59,058 49,393 Less: Billings to date (45,731 ) (41,262 ) $13,327 $8,131 Included in the accompanying Consolidated Balance Sheets under the following captions: Accounts receivable, net (costs and estimated earnings in excess of billings) $14,183 $9,377 Accrued expenses and other current liabilities (billings in excess of costs and estimated earnings) (856 ) (1,246 ) $13,327 $8,131
Schedule of Inventory [Table Text Block]	Inventories As of October 31, (in thousands) 2018 2017 Finished products $192,758 $173,559 Work in process 49,315 39,986 Materials, parts, assemblies and supplies 158,039 128,031 Contracts in process 1,649 2,415 Less: Billings to date (208 ) (363 ) Inventories, net of valuation reserves $401,553 $343,628
Property, Plant and Equipment [Table Text Block]	Property, Plant and Equipment As of October 31, (in thousands) 2018 2017 Land $5,864 $5,435 Buildings and improvements 101,424 91,916 Machinery, equipment and tooling 230,108 191,298 Construction in progress 5,044 5,553 342,440 294,202 Less: Accumulated depreciation and amortization (187,701 ) (164,319 ) Property, plant and equipment, net $154,739 $129,883
Schedule Of Accrued Expenses and Other Current Liabilities [Table Text Block]	Accrued Expenses and Other Current Liabilities As of October 31, (in thousands) 2018 2017 Accrued employee compensation and related payroll taxes $97,048 $78,058 Deferred revenue 28,262 29,247 Accrued customer rebates and credits 16,861 12,866 Contingent consideration and other accrued purchase consideration 6,138 7,588 Other 23,205 19,853 Accrued expenses and other current liabilities $171,514 $147,612
Schedule of Research and Development Expenses [Table Text Block]	The amount of new product research and development ("R&D") expenses included in cost of sales is as follows (in thousands): Year ended October 31, 2018 2017 2016 R&D expenses $57,450 $46,473 $44,726
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Changes in the components of accumulated other comprehensive loss during fiscal 2018 and 2017 are as follows (in thousands): Foreign Currency Translation Pension Benefit Obligation Accumulated Other Comprehensive Loss Balances as of October 31, 2016 ($23,953 ) ($1,373 ) ($25,326 ) Unrealized gain 14,420 321 14,741 Amortization of unrealized loss — 29 29 Balances as of October 31, 2017 (9,533 ) (1,023 ) (10,556 ) Unrealized (loss) gain (4,837 ) 124 (4,713 ) Amortization of unrealized loss — 13 13 Balances as of October 31, 2018 ($14,370 ) ($886 ) ($15,256 )

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	12 Months Ended
	Oct. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	Changes in the carrying amount of goodwill during fiscal 2018 and 2017 by operating segment are as follows (in thousands): Segment Consolidated FSG ETG Totals Balances as of October 31, 2016 $336,681 $529,036 $865,717 Goodwill acquired 48,960 160,903 209,863 Foreign currency translation adjustments 2,965 2,761 5,726 Balances as of October 31, 2017 388,606 692,700 1,081,306 Goodwill acquired 10,586 27,734 38,320 Adjustments to goodwill 972 (3,003 ) (2,031 ) Foreign currency translation adjustments (1,470 ) (1,293 ) (2,763 ) Balances as of October 31, 2018 $398,694 $716,138 $1,114,832
Schedule Of Identifiable Intangible Assets [Table Text Block]	Identifiable intangible assets consist of the following (in thousands): As of October 31, 2018 As of October 31, 2017 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortizing Assets: Customer relationships $373,946 ($135,359 ) $238,587 $379,966 ($117,069 ) $262,897 Intellectual property 185,983 (56,055 ) 129,928 181,811 (44,861 ) 136,950 Licenses 6,559 (3,522 ) 3,037 6,559 (2,928 ) 3,631 Patents 927 (609 ) 318 870 (551 ) 319 Non-compete agreements 814 (814 ) — 817 (817 ) — Trade names 466 (157 ) 309 466 (118 ) 348 568,695 (196,516 ) 372,179 570,489 (166,344 ) 404,145 Non-Amortizing Assets: Trade names 134,181 — 134,181 133,936 — 133,936 $702,876 ($196,516 ) $506,360 $704,425 ($166,344 ) $538,081

LONG-TERM DEBT (Tables)

LONG-TERM DEBT (Tables)	12 Months Ended
	Oct. 31, 2018
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	Long-term debt consists of the following (in thousands): As of October 31, 2018 2017 Borrowings under revolving credit facility $523,000 $671,000 Capital leases and note payable 9,470 2,979 532,470 673,979 Less: Current maturities of long-term debt (859 ) (451 ) $531,611 $673,528
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]	The estimated future minimum lease payments of all capital leases for the next five fiscal years and thereafter are as follows (in thousands): Year ending October 31, 2019 $1,240 2020 1,191 2021 1,184 2022 1,175 2023 873 Thereafter 6,412 Total minimum lease payments 12,075 Less: amount representing interest (2,718 ) Present value of minimum lease payments $9,357

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Oct. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	The components of income before income taxes and noncontrolling interests are as follows (in thousands): Year ended October 31, 2018 2017 2016 Domestic $309,123 $264,420 $227,927 Foreign 47,163 33,540 29,123 Income before taxes and noncontrolling interests $356,286 $297,960 $257,050
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	The components of the provision for income taxes on income before income taxes and noncontrolling interests are as follows (in thousands): Year ended October 31, 2018 2017 2016 Current: Federal $61,548 $85,047 $75,261 State 9,420 6,820 7,463 Foreign 12,608 9,529 7,370 83,576 101,396 90,094 Deferred: Federal (13,115 ) (9,661 ) (5,979 ) State 1,578 (499 ) (2,587 ) Foreign (1,439 ) (936 ) (628 ) (12,976 ) (11,096 ) (9,194 ) Total income tax expense $70,600 $90,300 $80,900
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	A reconciliation of the federal statutory income tax rate to the Company’s effective tax rate is as follows: Year ended October 31, 2018 2017 2016 Federal statutory income tax rate (blended rate in fiscal 2018) 23.3 % 35.0 % 35.0 % State taxes, net of federal income tax benefit 2.9 % 1.9 % 1.7 % Discrete net tax benefit related to Tax Act (3.4 %) — % — % Research and development tax credits (2.0 %) (1.8 %) (2.7 %) Domestic production activities tax deduction (.8 %) (1.1 %) (1.3 %) Tax benefit related to stock option exercises (.5 %) (1.0 %) — % Noncontrolling interests’ share of income (.3 %) (.7 %) (.7 %) Tax-exempt losses (gains) on corporate-owned life insurance policies .1 % (1.8 %) (.1 %) Other, net .5 % (.2 %) (.4 %) Effective tax rate 19.8 % 30.3 % 31.5 %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	Significant components of the Company’s deferred tax assets and liabilities are as follows (in thousands): As of October 31, 2018 2017 Deferred tax assets: Deferred compensation liability $31,152 $47,093 Inventories 22,204 31,797 Share-based compensation 9,811 12,984 Bonus accrual 4,474 4,956 Customer rebates accrual 1,526 1,864 Vacation accrual 1,456 2,112 Deferred revenue 68 730 Other 7,084 9,230 Total deferred tax assets 77,775 110,766 Deferred tax liabilities: Goodwill and other intangible assets (112,533 ) (160,158 ) Property, plant and equipment (11,615 ) (7,887 ) Other (271 ) (1,747 ) Total deferred tax liabilities (124,419 ) (169,792 ) Net deferred tax liability ($46,644 ) ($59,026 )
Summary of Income Tax Contingencies [Table Text Block]	A reconciliation of the activity related to the liability for gross unrecognized tax benefits during fiscal 2018 and 2017 is as follows (in thousands): Year ended October 31, 2018 2017 Balances as of beginning of year $2,040 $1,602 Increases related to current year tax positions 591 596 Increases related to prior year tax positions 20 — Decreases related to prior year tax positions — (24 ) Settlements (394 ) — Lapses of statutes of limitations (157 ) (134 ) Balances as of end of year $2,100 $2,040

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Oct. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The Company's assets and liabilities that were measured at fair value on a recurring basis are set forth by level within the fair value hierarchy in the following tables (in thousands): As of October 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: Deferred compensation plans: Corporate-owned life insurance $— $123,255 $— $123,255 Money market funds 3,560 — — 3,560 Equity securities 3,179 — — 3,179 Mutual funds 1,437 — — 1,437 Other 1,306 — — 1,306 Total assets $9,482 $123,255 $— $132,737 Liabilities: Contingent consideration $— $— $20,875 $20,875 As of October 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: Deferred compensation plans: Corporate-owned life insurance $— $113,220 $— $113,220 Money market funds 3,972 — — 3,972 Equity securities 2,895 — — 2,895 Mutual funds 1,541 — — 1,541 Other 1,246 — — 1,246 Total assets $9,654 $113,220 $— $122,874 Liabilities: Contingent consideration $— $— $27,573 $27,573
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]	The Level 3 inputs used to derive the estimated fair value of the Company's contingent consideration liability as of October 31, 2018 are as follows: Fiscal 2017 Acquisition Fiscal 2016 Acquisition Fiscal 2015 Acquisition Compound annual revenue growth rate range (4%) - 7% 4 % - 13% 10 % - 13% Weighted average discount rate 6.3% 4.8% .8%
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	Changes in the Company’s contingent consideration liability measured at fair value on a recurring basis using unobservable inputs (Level 3) during fiscal 2018 and 2017 are as follows (in thousands): Liabilities Balance as of October 31, 2016 $18,881 Contingent consideration related to acquisition 13,797 Increase in accrued contingent consideration, net 1,100 Payment of contingent consideration (7,039 ) Foreign currency transaction adjustments 834 Balance as of October 31, 2017 27,573 Payment of contingent consideration (5,425 ) Decrease in accrued contingent consideration, net (1,365 ) Foreign currency transaction adjustments 92 Balance as of October 31, 2018 $20,875 Included in the accompanying Consolidated Balance Sheet under the following captions: Accrued expenses and other current liabilities $6,107 Other long-term liabilities 14,768 $20,875

SHARE-BASED COMPENSATION (Table

SHARE-BASED COMPENSATION (Tables)	12 Months Ended
	Oct. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule Of Share Based Compensation Stock Options Activity And Shares Available For Grants [Table Text Block]	Information concerning share-based activity for each of the last three fiscal years ended October 31 is as follows (in thousands, except per share data): Shares Under Option Shares Available For Grant Shares Weighted Average Exercise Price Outstanding as of October 31, 2015 2,590 6,514 $13.07 Granted (586 ) 586 $23.58 Exercised — (568 ) $10.45 Cancelled 12 (12 ) $18.62 Outstanding as of October 31, 2016 2,016 6,520 $14.23 Granted (1,186 ) 1,186 $41.37 Exercised — (409 ) $15.27 Outstanding as of October 31, 2017 830 7,297 $18.58 Shares approved by the Company's shareholders for the 2018 Incentive Compensation Plan 5,000 — $— Cancelled unissued shares under the 2012 Incentive Compensation Plan (830 ) — $— Granted (412 ) 412 $65.64 Exercised — (1,285 ) $10.54 Cancelled 24 (24 ) $28.85 Outstanding as of October 31, 2018 4,612 6,400 $23.19
Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block]	Information concerning stock options outstanding (all of which are vested or expected to vest) and stock options exercisable by class of common stock as of October 31, 2018 is as follows (in thousands, except per share and contractual life data): Options Outstanding Number Outstanding Weighted Average Exercise Price Weighted Average Remaining Contractual Life (Years) Aggregate Intrinsic Value Common Stock 2,955 $23.48 4.4 $178,327 Class A Common Stock 3,445 $22.94 5.5 150,649 6,400 $23.19 5.0 $328,976 Options Exercisable Number Outstanding Weighted Average Exercise Price Weighted Average Remaining Contractual Life (Years) Aggregate Intrinsic Value Common Stock 2,197 $14.75 3.0 $151,756 Class A Common Stock 2,160 $15.59 4.1 110,297 4,357 $15.17 3.5 $262,053
Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block] (Deprecated 2017-01-31)	Information concerning stock options exercised is as follows (in thousands): Year ended October 31, 2018 2017 2016 Cash proceeds from stock option exercises $4,031 $5,659 $5,924 Tax benefit realized from stock option exercises 2,162 3,087 868 Intrinsic value of stock option exercises 75,152 10,376 9,751
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	The fair value of each stock option grant in fiscal 2018, 2017 and 2016 was estimated on the date of grant using the Black-Scholes option-pricing model based on the following weighted average assumptions: Year ended October 31, 2018 2017 2016 Common Stock Class A Common Stock Common Stock Class A Common Stock Common Stock Class A Common Stock Expected stock price volatility 31.00 % 27.69 % 37.89 % 28.18 % 39.63 % 32.52 % Risk-free interest rate 2.83 % 2.81 % 2.44 % 2.06 % 2.16 % 1.82 % Dividend yield .24 % .29 % .26 % .31 % .24 % .32 % Forfeiture rate .00 % .00 % .00 % .00 % .00 % .00 % Expected option life (years) 9 8 9 7 9 6 Weighted average fair value $30.00 $20.93 $21.36 $12.47 $12.10 $7.92

EMPLOYEE RETIREMENT PLANS EMPLO

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS (Tables)	12 Months Ended
	Oct. 31, 2018
Retirement Benefits [Abstract]
Schedule of Other Share-based Compensation, Activity [Table Text Block]	Information concerning share-based activity pertaining to the 401(k) Plan for each of the last three fiscal years ended October 31 is as follows (in thousands): Common Stock Class A Common Stock Shares available for issuance as of October 31, 2015 28 28 Shares registered for issuance to the 401(k) Plan 586 586 Issuance of common stock to the 401(k) Plan (123 ) (123 ) Shares available for issuance as of October 31, 2016 491 491 Issuance of common stock to the 401(k) Plan (93 ) (93 ) Shares available for issuance as of October 31, 2017 398 398 Issuance of common stock to the 401(k) Plan (65 ) (65 ) Shares available for issuance as of October 31, 2018 333 333
Schedule of Changes in Projected Benefit Obligations [Table Text Block]	Changes in the Plan's projected benefit obligation and plan assets during fiscal 2018 and 2017 are as follows (in thousands): Change in projected benefit obligation: Projected benefit obligation as of October 31, 2016 $14,511 Actuarial gain (156 ) Interest cost 561 Benefits paid (916 ) Projected benefit obligation as of October 31, 2017 14,000 Actuarial gain (749 ) Interest cost 539 Benefits paid (900 ) Projected benefit obligation as of October 31, 2018 $12,890 Change in plan assets: Fair value of plan assets as of October 31, 2016 $10,510 Actual return on plan assets 1,048 Employer contributions 428 Benefits paid (916 ) Fair value of plan assets as of October 31, 2017 11,070 Actual return on plan assets (151 ) Employer contributions 360 Benefits paid (900 ) Fair value of plan assets as of October 31, 2018 $10,379 Funded status as of October 31, 2017 ($2,930 ) Funded status as of October 31, 2018 ($2,511 )
Schedule of Assumptions Used [Table Text Block]	Weighted average assumptions used to determine the projected benefit obligation are as follows: As of October 31, 2018 2017 Discount rate 4.49 % 3.98 % Weighted average assumptions used to determine net pension income are as follows: Year ended October 31, 2018 2017 2016 Discount rate 3.98 % 3.99 % 4.47 % Expected return on plan assets 6.75 % 6.75 % 6.75 %
Schedule of Net Benefit Costs [Table Text Block]	Components of net pension income that were recorded within the Company's Consolidated Statements of Operations are as follows (in thousands): Year ended October 31, 2018 2017 2016 Expected return on plan assets $728 $688 $702 Less: Interest cost (539 ) (561 ) (613 ) Less: Amortization of unrealized loss (17 ) (46 ) — Net pension income $172 $81 $89
Schedule of Expected Benefit Payments [Table Text Block]	Estimated future benefit payments to be made during each of the next five fiscal years and in aggregate during the succeeding five fiscal years are as follows (in thousands): Year ending October 31, 2019 $930 2020 929 2021 897 2022 877 2023 869 2024-2028 4,329
Schedule of Allocation of Plan Assets [Table Text Block]	The fair value of the Plan's assets are set forth by level within the fair value hierarchy in the following tables (in thousands): As of October 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fixed income securities $5,276 $— $— $5,276 Equity securities 5,006 — — 5,006 Money market funds and cash 97 — — 97 $10,379 $— $— $10,379 As of October 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fixed income securities $5,382 $— $— $5,382 Equity securities 5,593 — — 5,593 Money market funds and cash 95 — — 95 $11,070 $— $— $11,070 Fixed income securities consist of investments in mutual funds. Equity securities consist of investments in common stocks, mutual funds and exchange traded funds. The Plan's actual and targeted asset allocations by investment category are as follows: As of October 31, 2018 2017 Actual Target Actual Target Fixed income securities 51 % 50 % 49 % 50 % Equity securities 48 % 50 % 50 % 50 % Money market funds and cash 1 % — % 1 % — % 100 % 100 % 100 % 100 %

REDEEMABLE NONCONTROLLING INT_2

REDEEMABLE NONCONTROLLING INTERESTS REDEEMABLE NONCONTROLLING INTERESTS (Tables)	12 Months Ended
	Oct. 31, 2018
Redeemable Noncontrolling Interests [Abstract]
Schedule of Put Rights [Table Text Block]	A summary of the Put Rights associated with the redeemable noncontrolling interests in certain of the Company’s subsidiaries as of October 31, 2018 is as follows: Subsidiary Operating Company Earliest Purchase 2005 ETG 95.9% 2019 (1) 4 (2) 2006 FSG 80.1% 2019 (1) 4 2008 FSG 82.3% 2019 (1) 5 2009 ETG 82.5% 2019 (1) 1 2012 ETG 78.0% 2019 (1) 2 2012 FSG 84.0% 2019 (1) 4 2012 FSG 80.1% 2019 (1) 4 2015 FSG 80.0% 2019 4 2015 FSG 80.1% 2020 4 2015 ETG 80.1% 2020 2 2015 FSG 80.1% 2022 4 2017 FSG 80.1% 2022 2 (3) 2018 ETG 85.0% 2021 1 (1) Currently puttable (2) A portion is to be purchased in a lump sum (3) The second purchase is to be made two years after the first Put Right Year

NET INCOME PER SHARE ATTRIBUT_2

NET INCOME PER SHARE ATTRIBUTABLE TO HEICO SHAREHOLDERS (Tables)	12 Months Ended
	Oct. 31, 2018
Earnings Per Share [Abstract]
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]	The computation of basic and diluted net income per share attributable to HEICO shareholders is as follows (in thousands, except per share data): Year ended October 31, 2018 2017 2016 Numerator: Net income attributable to HEICO $259,233 $185,985 $156,192 Denominator: Weighted average common shares outstanding - basic 132,543 131,703 130,948 Effect of dilutive stock options 4,153 3,885 2,197 Weighted average common shares outstanding - diluted 136,696 135,588 133,145 Net income per share attributable to HEICO shareholders: Basic $1.96 $1.41 $1.19 Diluted $1.90 $1.37 $1.17 Anti-dilutive stock options excluded 512 799 1,133

QUARTERLY FINANCIAL INFORMATI_2

QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Tables)	12 Months Ended
	Oct. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]	QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (in thousands, except per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Net sales: 2018 $404,410 $430,602 $465,825 $476,884 2017 $343,432 $368,657 $391,500 $421,224 Gross profit: 2018 $154,791 $167,857 $181,609 $186,458 2017 $125,417 $140,382 $148,897 $160,029 Net income from consolidated operations: 2018 $71,695 $66,011 $73,899 $74,081 2017 $46,265 $50,833 $51,475 $59,087 Net income attributable to HEICO: 2018 $65,152 $59,618 $67,086 $67,377 2017 $40,927 $45,686 $45,698 $53,674 Net income per share attributable to HEICO: Basic: 2018 $.49 $.45 $.51 $.51 2017 $.31 $.35 $.35 $.41 Diluted: 2018 $.48 $.44 $.49 $.49 2017 $.30 $.34 $.34 $.39

OPERATING SEGMENTS (Tables)

OPERATING SEGMENTS (Tables)	12 Months Ended
	Oct. 31, 2018
Segment Reporting [Abstract]
Schedule of Segment Reporting Information by Segment [Table Text Block]	Information on the Company’s two operating segments, the FSG and the ETG, for each of the last three fiscal years ended October 31 is as follows (in thousands): Segment Other, Primarily Corporate and Intersegment (1) Consolidated Totals FSG ETG Year ended October 31, 2018: Net sales $1,097,937 $701,827 ($22,043 ) $1,777,721 Depreciation 13,322 9,225 692 23,239 Amortization 19,530 33,339 1,083 53,952 Operating income 206,623 204,508 (34,886 ) 376,245 Capital expenditures 13,074 9,531 19,266 41,871 Total assets 1,093,858 1,391,997 167,541 2,653,396 Year ended October 31, 2017: Net sales $967,540 $574,261 ($16,988 ) $1,524,813 Depreciation 13,042 8,609 227 21,878 Amortization 18,026 24,167 752 42,945 Operating income 179,278 157,451 (30,071 ) 306,658 Capital expenditures 15,665 10,100 233 25,998 Total assets 1,042,925 1,339,363 130,143 2,512,431 Year ended October 31, 2016: Net sales $875,870 $511,272 ($10,884 ) $1,376,258 Depreciation 12,113 8,030 218 20,361 Amortization 16,590 22,664 662 39,916 Operating income 163,427 126,031 (24,113 ) 265,345 Capital expenditures 18,434 11,962 467 30,863 Total assets 877,672 1,015,696 105,044 1,998,412 (1) Intersegment activity principally consists of net sales from the ETG to the FSG.
Schedule of Product Information [Table Text Block]	The following table summarizes the Company’s net sales to external customers by product lines included in each operating segment (in thousands): Year ended October 31, 2018 2017 2016 Flight Support Group: Aftermarket replacement parts (1) $582,562 $489,644 $405,108 Repair and overhaul parts and services (2) 286,454 270,482 251,357 Specialty products (3) 228,921 207,414 219,405 Total net sales 1,097,937 967,540 875,870 Electronic Technologies Group: Electronic component parts for defense, space and aerospace equipment (4) 547,088 420,991 371,297 Electronic component parts for equipment in various other industries (5) 154,739 153,270 139,975 Total net sales 701,827 574,261 511,272 Other, primarily corporate and intersegment (22,043 ) (16,988 ) (10,884 ) Total consolidated net sales $1,777,721 $1,524,813 $1,376,258 (1) Includes various jet engine and aircraft component replacement parts. (2) Includes primarily the sale of parts consumed in various repair and overhaul services on selected jet engine and aircraft components, avionics, instruments, composites and flight surfaces of commercial and military aircraft. (3) Includes primarily the sale of specialty components such as thermal insulation blankets, renewable/reusable insulation systems, advanced niche components, complex composite assemblies, and expanded foil mesh. (4) Includes various component parts such as electro-optical infrared simulation and test equipment, electro-optical laser products, electro-optical, microwave and other power equipment, high-speed interface products, power conversion products, underwater locator beacons, emergency locator transmission beacons, traveling wave tube amplifiers, microwave power modules, three-dimensional microelectronic and stacked memory products, crashworthy and ballistically self-sealing auxiliary fuel systems, radio frequency (RF) and microwave amplifiers, transmitters and receivers, high performance communications and electronic intercept receivers and tuners and high performance active antenna systems. (5)
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	The following table also summarizes the Company’s long-lived assets held within and outside of the United States as of October 31 of the last three fiscal years (in thousands). Long-lived assets consist of net property, plant and equipment. 2018 2017 2016 Net Sales: United States of America $1,127,998 $1,007,491 $904,670 Other countries 649,723 517,322 471,588 Total net sales $1,777,721 $1,524,813 $1,376,258 Long-lived assets: United States of America $124,225 $97,367 $94,889 Other countries 30,514 32,516 26,722 Total long-lived assets $154,739 $129,883 $121,611

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Oct. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Future minimum payments under non-cancelable operating leases for the next five fiscal years and thereafter are estimated to be as follows (in thousands): Year ending October 31, 2019 $14,961 2020 14,991 2021 14,147 2022 12,546 2023 7,334 Thereafter 18,007 Total minimum lease commitments $81,986
Schedule of Product Warranty Liability [Table Text Block]	Changes in the Company’s product warranty liability in fiscal 2018 and 2017 are as follows (in thousands): Year ended October 31, 2018 2017 Balances as of beginning of year $2,921 $3,351 Accruals for warranties 2,720 2,254 Acquired warranty liabilities 320 — Warranty claims settled (2,655 ) (2,684 ) Balances as of end of year $3,306 $2,921

SUPPLEMENTAL DISCLOSURES OF C_2

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION (Tables)	12 Months Ended
	Oct. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	The following table presents supplemental disclosures of cash flow information and non-cash investing activities for fiscal 2018, 2017 and 2016 (in thousands): Year ended October 31, 2018 2017 2016 Cash paid for income taxes $90,488 $95,851 $87,486 Cash received from income tax refunds (1,510 ) (2,953 ) (1,906 ) Cash paid for interest 19,233 9,631 8,288 Contingent consideration — 13,797 1,225 Additional purchase consideration (407 ) 220 — Property, plant and equipment acquired through capital lease obligations 7,166 37 1,111

SUMMARY OF SIGNIFICANT ACCOUN_4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Oct. 31, 2018
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Other Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Other Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Tooling [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Tooling [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years

SUMMARY OF SIGNIFICANT ACCOUN_5

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2)	12 Months Ended
	Oct. 31, 2018
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Intellectual Property [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Intellectual Property [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	22 years
Licensing Agreements [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Licensing Agreements [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	17 years
Patents [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Patents [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Trade Names [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	8 years
Trade Names [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years

SUMMARY OF SIGNIFICANT ACCOUN_6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textuals) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016	Jul. 31, 2018	Jan. 31, 2018	Apr. 30, 2017
Summary Of Significant Accounting Policies (Details) [Abstract]
Common Stock Dividend Percentage Rate				25.00%	25.00%	25.00%
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Depreciation Methods	Depreciation and amortization is generally provided on the straight-line method over the estimated useful lives of the various assets.
Business Combination, Description [Abstract]
Business Acquisition, Transaction Costs			$ 3,200
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Method	The Company’s intangible assets subject to amortization are amortized on the straight-line method (except for certain customer relationships amortized on an accelerated method) over the following estimated useful lives
Revenue Recognition [Abstract]
Percent of Revenue from Services Renderred	10.00%
Net Sales Recognized from Percentage-Of-Completion Method	2.00%	3.00%	3.00%
Proceeds from Life Insurance Policy			$ 100
Net Investment Related to Deferred Compensation Plan	$ 11,500	$ 13,400	$ 10,529
Subsidiary Seven [Member] | HEICO Electronic [Member] | Subsidiary Seven [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	53.10%
Subsidiary Six [Member] | HEICO Electronic [Member] | Subsidiary Six [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	85.00%
Subsidiary Four [Member] | HEICO Electronic [Member] | Subsidiary Four [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	95.90%
Subsidiary Three [Member] | HEICO Electronic [Member] | Subsidiary Three [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	82.50%
Joint Venture [Member] | Heico Aerospace [Member] | Joint Venture [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	84.00%
Subsidiary Two [Member] | Heico Flight Support Corp [Member] | Subsidiary Two [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	84.00%
Subsidiary Two [Member] | HEICO Electronic [Member] | Subsidiary Two [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	80.10%
Subsidiary Two [Member] | Heico Aerospace [Member] | Subsidiary Two [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	82.30%
Certain Subsidiaries [Member] | Heico Flight Support Corp [Member] | Subsidiaries [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	80.10%
Heico Aerospace [Member] | Lufthansa Technik AG [Member] | Heico Aerospace [Member] | Heico Aerospace [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percentage of interest owned by noncontrolling shareholders	20.00%
Subsidiary One [Member] | Heico Flight Support Corp [Member] | Subsidiary One [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	80.00%
Subsidiary One [Member] | HEICO Electronic [Member] | Subsidiary One [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	80.10%
Subsidiary One [Member] | Heico Aerospace [Member] | Subsidiary One [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	80.10%
Subsidiary Five [Member] | HEICO Electronic [Member] | Subsidiary Five [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	78.00%

ACQUISITIONS ACQUISITIONS (Deta

ACQUISITIONS ACQUISITIONS (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Business Acquisition [Line Items]
Cash paid, net	$ 59,775	$ 418,265	$ 263,811
Electronic Technologies Group [Member] | AAT [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	317,500
Cash Acquired from Acquisition	(868)
Cash paid, net	316,632
Contingent purchase consideration	13,797
Additional purchase consideration	(544)
Total purchase consideration	$ 330,973

ACQUISITIONS ACQUISITIONS (De_2

ACQUISITIONS ACQUISITIONS (Details 2) - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Assets acquired:
Goodwill	$ 1,114,832	$ 1,081,306	$ 865,717
Inventories	8,306
Electronic Technologies Group [Member]
Assets acquired:
Goodwill	716,138	$ 692,700	$ 529,036
Electronic Technologies Group [Member] | AAT [Member]
Assets acquired:
Goodwill	157,901
Accounts receivable	6,115
Property, plant and equipment	1,893
Other assets	208
Total assets acquired, excluding cash	333,423
Liabilities assumed:
Accounts payable	1,299
Accrued expenses	1,151
Total liabilities assumed	2,450
Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	330,973
Electronic Technologies Group [Member] | AAT [Member] | Trade Names [Member]
Assets acquired:
Identifiable intangible assets, indefinite-lived	20,000
Electronic Technologies Group [Member] | AAT [Member] | Customer Relationships [Member]
Assets acquired:
Identifiable intangible assets, finite-lived	100,000
Electronic Technologies Group [Member] | AAT [Member] | Intellectual Property [Member]
Assets acquired:
Identifiable intangible assets, finite-lived	$ 39,000

ACQUISITIONS ACQUISITIONS (De_3

ACQUISITIONS ACQUISITIONS (Details 3) - Electronic Technologies Group [Member] - AAT [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Business Acquisition [Line Items]
Pro Forma Revenue	$ 1,582,653	$ 1,428,336
Pro Forma Net Income (Loss) Attributable to HEICO	220,419	185,070
Pro Forma Net Income Attributable to Parent	$ 198,744	$ 165,112
Pro Forma Net Income (Loss) Per Share Attributable To Common Shareholders [Abstract]
Pro Forma Earnings Per Share, Basic	$ 1.51	$ 1.26
Pro Forma Earnings Per Share, Diluted	$ 1.47	$ 1.24

ACQUISITIONS ACQUISITIONS (De_4

ACQUISITIONS ACQUISITIONS (Details 4) - Electronic Technologies Group [Member] - Robertson [Member] $ in Thousands	12 Months Ended
	Oct. 31, 2018USD ($)
Business Acquisition [Line Items]
Cash paid	$ 256,293
Less: cash acquired	(3,271)
Total purchase consideration	$ 253,022

ACQUISITIONS (Details 5)

ACQUISITIONS (Details 5) - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Assets acquired:
Goodwill	$ 1,114,832	$ 1,081,306	$ 865,717
Inventories	8,306
Electronic Technologies Group [Member]
Assets acquired:
Goodwill	716,138	$ 692,700	$ 529,036
Electronic Technologies Group [Member] | Robertson [Member]
Assets acquired:
Goodwill	93,425
Inventories	27,417
Property, plant and equipment	7,476
Accounts receivable	4,973
Other assets	1,884
Total assets acquired, excluding cash	258,275
Liabilities assumed:
Accounts payable	4,606
Accrued expenses	647
Total liabilities assumed	5,253
Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	253,022
Electronic Technologies Group [Member] | Robertson [Member] | Trade Names [Member]
Assets acquired:
Identifiable intangible assets, indefinite-lived	28,400
Electronic Technologies Group [Member] | Robertson [Member] | Customer Relationships [Member]
Assets acquired:
Identifiable intangible assets, finite-lived	55,100
Electronic Technologies Group [Member] | Robertson [Member] | Intellectual Property [Member]
Assets acquired:
Identifiable intangible assets, finite-lived	$ 39,600

ACQUISITIONS ACQUISITIONS (De_5

ACQUISITIONS ACQUISITIONS (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Business Acquisition [Line Items]
Cash paid, net	$ 59,775	$ 418,265	$ 263,811
Other Acquisitions [Member]
Business Acquisition [Line Items]
Cash paid	61,931	109,346	11,000
Less: cash acquired	(4,000)	(7,713)	0
Cash paid, net	57,931	101,633	11,000
Contingent purchase consideration	0	0	1,225
Additional purchase consideration	(407)	1,300	0
Total purchase consideration	$ 57,524	$ 102,933	$ 12,225

ACQUISITIONS ACQUISITIONS (De_6

ACQUISITIONS ACQUISITIONS (Details 7) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Assets acquired:
Goodwill	$ 1,114,832	$ 1,081,306	$ 865,717
Inventories	8,306
Other Acquisitions [Member]
Assets acquired:
Goodwill	38,320	49,932	6,876
Inventories	6,219	28,410	249
Accounts receivable	1,488	15,165	0
Property, plant and equipment	1,807	4,522	0
Other assets	51	982	0
Total assets acquired, excluding cash	67,235	147,211	12,225
Liabilities assumed:
Accounts payable	671	7,696	0
Accrued expenses	1,522	6,054	0
Deferred income taxes	0	5,432	0
Other liabilities	0	1,434	0
Total liabilities assumed	2,193	20,616	0
Noncontrolling interests in consolidated subsidiaries	7,518	23,662	0
Net assets acquired, excluding cash	57,524	102,933	12,225
Other Acquisitions [Member] | Customer Relationships [Member]
Assets acquired:
Identifiable intangible assets	11,620	29,500	2,800
Other Acquisitions [Member] | Trade Names [Member]
Assets acquired:
Identifiable intangible assets	760	16,750	300
Other Acquisitions [Member] | Intellectual Property [Member]
Assets acquired:
Identifiable intangible assets	$ 6,970	$ 1,950	$ 2,000

ACQUISITIONS ACQUISITIONS (De_7

ACQUISITIONS ACQUISITIONS (Details 8)	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years	12 years	11 years
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			15 years
Intellectual Property [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years	13 years	15 years

ACQUISITIONS (Details Textuals)

ACQUISITIONS (Details Textuals) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Business Acquisition [Line Items]
Net sales	$ 476,884	$ 465,825	$ 430,602	$ 404,410	$ 421,224	$ 391,500	$ 368,657	$ 343,432	$ 1,777,721	$ 1,524,813	$ 1,376,258
Net income	67,377	$ 67,086	$ 59,618	$ 65,152	53,674	$ 45,698	$ 45,686	$ 40,927	259,233	185,985	156,192
Acquisition Costs											3,200
Payments to Acquire Businesses, Net of Cash Acquired									59,775	418,265	$ 263,811
Contingent consideration, liability	$ 20,875				$ 27,573				$ 20,875	$ 27,573
Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									7 years	12 years	11 years
Intellectual Property [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									10 years	13 years	15 years
FY 2017 Acquisition [Member]
Business Acquisition [Line Items]
Net sales									$ 49,000
Pro Forma Revenue											$ 1,464,500
CBD [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition									Jun. 30, 2017
Name of Acquired Entity									Carbon by Design
Description of Acquired Entity									CBD is a manufacturer of composite components for UAVs, rockets, spacecraft and other specialized applications.
A2C [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition									Apr. 30, 2017
Name of Acquired Entity									Air Cost Control
Description of Acquired Entity									A2C is a leading aviation electrical interconnect product distributor of items such as connectors, wire, cable, protection and fastening systems, in addition to distributing a wide range of electromechanical parts.
Percentage of interest acquired in the subsidiary	80.10%								80.10%
Electronic Technologies Group [Member]
Business Acquisition [Line Items]
Net sales									$ 701,827	$ 574,261	511,272
Electronic Technologies Group [Member] | FY 2017 Acquisition [Member]
Business Acquisition [Line Items]
Amount of contingent purchase consideration, the company could be required to pay	$ 20,000								20,000
Contingent consideration, liability	13,900								$ 13,900
Electronic Technologies Group [Member] | AAT [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition									Sep. 15, 2017
Name of Acquired Entity									AeroAntenna Technology, Inc.
Description of Acquired Entity									AAT designs and produces high performance active antenna systems for commercial aircraft, precision guided munitions, other defense applications and commercial uses.
Amount of contingent purchase consideration, the company could be required to pay	$ 13,800								$ 13,800
Net sales										10,200
Net income										2,500
Payments to Acquire Businesses, Net of Cash Acquired									316,632
Cash Acquired from Acquisition									$ 868
Pro Forma Revenue										1,582,653	1,428,336
Electronic Technologies Group [Member] | AAT [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									15 years
Electronic Technologies Group [Member] | AAT [Member] | Intellectual Property [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									15 years
Electronic Technologies Group [Member] | Robertson [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition									Jan. 11, 2016
Name of Acquired Entity									Robertson Fuel Systems, LLC
Description of Acquired Entity									Robertson designs and produces mission-extending, crashworthy and ballistically self-sealing auxiliary fuel systems for military rotorcraft.
Net sales											84,100
Net income											12,300
Acquisition Costs											3,100
Cash Acquired from Acquisition									$ 3,271
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] | SST [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition									Sep. 30, 2018
Name of Acquired Entity									SST Components, Inc. (“SST”)
Description of Acquired Entity									SST manufactures discrete semiconductor components, tests electronic components, and custom assembles a wide variety of prototype and off the shelf components into desired package styles for military, space and commercial uses.
Percentage of interest acquired in the subsidiary	53.10%								53.10%
Electronic Technologies Group [Member] | ELT [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition									Apr. 30, 2018
Description of Acquired Entity									The ELT Product Line designs and manufactures Emergency Locator Transmitter Beacons for the commercial aviation and defense markets, that upon activation, transmit a distress signal to alert search and rescue operations of the aircraft's location.
Electronic Technologies Group [Member] | STE [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition									Feb. 28, 2018
Name of Acquired Entity									Sensor Technology Engineering, Inc. ("Sensor Technology")
Description of Acquired Entity									Sensor Technology designs and manufactures sophisticated nuclear radiation detectors for law enforcement, homeland security and military applications.
Percentage of interest acquired in the subsidiary	85.00%								85.00%
Electronic Technologies Group [Member] | IDC [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition									Nov. 30, 2017
Name of Acquired Entity									Interface Displays & Controls, Inc. ("IDC")
Description of Acquired Entity									IDC designs and manufactures electronic products for aviation, marine, military fighting vehicles, and embedded computing markets.
Electronic Technologies Group [Member] | Certain Assets [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition									Dec. 31, 2015
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
Flight Support Group [Member]
Business Acquisition [Line Items]
Net sales									$ 1,097,937	$ 967,540	$ 875,870
Flight Support Group [Member] | ODE [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition									Aug. 31, 2018
Name of Acquired Entity									Optical Display Engineering ("ODE")
Description of Acquired Entity									ODE is a Federal Aviation Administration ("FAA")-authorized Part 145 Repair Station focusing on the repair of LCD screens and display modules for aviation displays used in civilian and military aircraft. ODE also holds FAA-Parts Manufacturer Approval authority to supply products that it repairs.
A2C [Member] | A2C [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders	19.90%								19.90%
STE [Member] | Electronic Technologies Group [Member] | STE [Member]
Business Acquisition [Line Items]
Percentage of interest owned by noncontrolling shareholders	15.00%								15.00%

SELECTED FINANCIAL STATEMENT _3

SELECTED FINANCIAL STATEMENT INFORMATION, Accounts Receivable (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017
Accounts receivable	$ 254,727	$ 225,462
Less: Allowance for doubtful accounts	(3,258)	(3,006)
Accounts receivable, net	$ 251,469	$ 222,456

SELECTED FINANCIAL STATEMENT _4

SELECTED FINANCIAL STATEMENT INFORMATION, Costs and Estimated Earnings on Uncompleted Percentage-of-Completion Contracts (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Costs incurred on uncompleted contracts	$ 39,350	$ 29,491
Estimated earnings	19,708	19,902
Total cost incurred and estimated earnings on uncompleted percentage-of completed contracts	59,058	49,393
Less: Billings to date	(45,731)	(41,262)
Unbilled Contracts Receivable	13,327	8,131
Included in the accompanying Consolidated Balance Sheets under the following captions:
Accounts receivable, net (costs and estimated earnings in excess of billings)	14,183	9,377
Accrued expenses and other current liabilities (billings in excess of costs and estimated earnings)	(856)	(1,246)
Unbilled Contracts Receivable	$ 13,327	$ 8,131

SELECTED FINANCIAL STATEMENT _5

SELECTED FINANCIAL STATEMENT INFORMATION, Inventories (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017
Finished products	$ 192,758	$ 173,559
Work in process	49,315	39,986
Materials, parts, assemblies and supplies	158,039	128,031
Contracts-in-process	1,649	2,415
Less: Billings to date	(208)	(363)
Inventories, net of valuation reserves	$ 401,553	$ 343,628

SELECTED FINANCIAL STATEMENT _6

SELECTED FINANCIAL STATEMENT INFORMATION, Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Property, Plant and Equipment [Line Items]
Land	$ 5,864	$ 5,435
Buildings and improvements	101,424	91,916
Machinery, equipment and tooling	230,108	191,298
Construction in progress	5,044	5,553
Property, Plant and Equipment, Gross	342,440	294,202
Less: Accumulated depreciation and amortization	(187,701)	(164,319)
Property, plant and equipment, net	$ 154,739	$ 129,883	$ 121,611

SELECTED FINANCIAL STATEMENT _7

SELECTED FINANCIAL STATEMENT INFORMATION, Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017
Accrued employee compensation and related payroll taxes	$ 97,048	$ 78,058
Deferred revenue	28,262	29,247
Accrued customer rebates and credits	16,861	12,866
Accrued additional purchase consideration	6,138	7,588
Other Liabilities, Current	23,205	19,853
Accrued expenses and other current liabilities	$ 171,514	$ 147,612

SELECTED FINANCIAL STATEMENT _8

SELECTED FINANCIAL STATEMENT INFORMATION SELECTED FINANCIAL STATEMENT INFORMATION, Research and Development Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
R&D expenses	$ 57,450	$ 46,473	$ 44,726

SELECTED FINANCIAL STATEMENT _9

SELECTED FINANCIAL STATEMENT INFORMATION SELECTED FINANCIAL STATEMENT INFORMATION, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Balance Start	$ (10,556)
Unrealized gain/(loss)	(5,327)	$ 15,696	$ (308)
Amortization of unrealized loss	(17)	(46)	0
Accumulated Other Comprehensive Income (Loss), Balance End	(15,256)	(10,556)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Balance Start	(9,533)	(23,953)
Unrealized gain/(loss)	(4,837)	14,420
Amortization of unrealized loss	0	0
Accumulated Other Comprehensive Income (Loss), Balance End	(14,370)	(9,533)	(23,953)
Pension Benefit Obligation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Balance Start	(1,023)	(1,373)
Unrealized gain/(loss)	124	321
Amortization of unrealized loss	13	29
Accumulated Other Comprehensive Income (Loss), Balance End	(886)	(1,023)	(1,373)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Balance Start	(10,556)	(25,326)
Unrealized gain/(loss)	(4,713)	14,741
Amortization of unrealized loss	13	29
Accumulated Other Comprehensive Income (Loss), Balance End	$ (15,256)	$ (10,556)	$ (25,326)

SELECTED FINANCIAL STATEMENT_10

SELECTED FINANCIAL STATEMENT INFORMATION (Details Textuals) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Property, Plant and Equipment [Abstract]
Property, plant and equipment, net	$ 154,739	$ 129,883	$ 121,611
Amortization	53,952	42,945	39,916
Assets under capital lease	11,900	4,800
Assets under capital lease, accumulated depreciation	1,500	1,000
Depreciation and amortization	77,191	64,823	60,277
Total customer rebates and credits deducted within net sales	$ 9,900	11,000	10,800
Other Assets and Liabilities, Noncurrent [Abstract]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Contributions to the plan charged	$ 5,900	4,600	6,800
Deferred compensation plans	132,737	122,874
Other Deferred Compensation Plan [Member]
Other Assets and Liabilities, Noncurrent [Abstract]
Employee related deferred compensation plans, specified as other long-term liabilities	5,900	5,700
Leadership Compensation Plan [Member]
Other Assets and Liabilities, Noncurrent [Abstract]
Employee related deferred compensation plans, specified as other long-term liabilities	125,800	116,000
Tooling [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment, net	8,200	7,600
Amortization	2,800	2,700	2,900
Property, Plant and Equipment, Exclusive of Tooling [Member]
Property, Plant and Equipment [Abstract]
Depreciation and amortization	23,200	21,900	$ 20,400
Leadership Compensation Plan [Member]
Other Assets and Liabilities, Noncurrent [Abstract]
Deferred compensation plans	$ 126,800	$ 117,200

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS, Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Goodwill [Roll Forward]
Opening Balances	$ 1,081,306	$ 865,717
Goodwill acquired	38,320	209,863
Foreign currency translation adjustments	2,763	(5,726)
Adjustments to goodwill	(2,031)
Ending Balances	1,114,832	1,081,306
Flight Support Group [Member]
Goodwill [Roll Forward]
Opening Balances	388,606	336,681
Goodwill acquired	10,586	48,960
Foreign currency translation adjustments	1,470	(2,965)
Adjustments to goodwill	972
Ending Balances	398,694	388,606
Electronic Technologies Group [Member]
Goodwill [Roll Forward]
Opening Balances	692,700	529,036
Goodwill acquired	27,734	160,903
Foreign currency translation adjustments	1,293	(2,761)
Adjustments to goodwill	(3,003)
Ending Balances	$ 716,138	$ 692,700

GOODWILL AND OTHER INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017
Amortizing Assets:
Customer Relationships, Gross	$ 373,946	$ 379,966
Intellectual Property, Gross	185,983	181,811
License, Gross	6,559	6,559
Patents, Gross	927	870
Noncompete Agreements, Gross	814	817
Trade Names, Gross	466	466
Gross Carrying Amount	568,695	570,489
Accumulated Amortization	(196,516)	(166,344)
Amortizing Net Carrying Amount	372,179	404,145
Non-Amortizing Assets:
Indefinite-Lived Trade Names	134,181	133,936
Total Gross Carrying Amount	702,876	704,425
Total Net Carrying Amount	506,360	538,081
Customer Relationships [Member]
Amortizing Assets:
Accumulated Amortization	(135,359)	(117,069)
Amortizing Net Carrying Amount	238,587	262,897
Intellectual Property [Member]
Amortizing Assets:
Accumulated Amortization	(56,055)	(44,861)
Amortizing Net Carrying Amount	129,928	136,950
Licensing Agreements [Member]
Amortizing Assets:
Accumulated Amortization	(3,522)	(2,928)
Amortizing Net Carrying Amount	3,037	3,631
Patents [Member]
Amortizing Assets:
Accumulated Amortization	(609)	(551)
Amortizing Net Carrying Amount	318	319
Noncompete Agreements [Member]
Amortizing Assets:
Accumulated Amortization	(814)	(817)
Amortizing Net Carrying Amount	0	0
Trade Names [Member]
Amortizing Assets:
Accumulated Amortization	(157)	(118)
Amortizing Net Carrying Amount	$ 309	$ 348

GOODWILL AND OTHER INTANGIBLE_5

GOODWILL AND OTHER INTANGIBLE ASSETS (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense related to intangible assets	$ 50.1	$ 39.5	$ 36.4
Estimated Amortization expense related to intangible assets, year one	49
Estimated Amortization expense related to intangible assets, year two	46.1
Estimated Amortization expense related to intangible assets, year three	43.4
Estimated Amortization expense related to intangible assets, year four	37
Estimated Amortization expense related to intangible assets, year five	32
Estimated Amortization expense related to intangible assets, year, there after	$ 164.7

LONG-TERM DEBT (Details)

LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017
Borrowings under revolving credit facility	$ 523,000	$ 671,000
Capital leases and notes payable	9,470	2,979
Total debt and capital leases	532,470	673,979
Less: Current maturities of long-term debt	(859)	(451)
Long-term debt, net of current maturities	$ 531,611	$ 673,528

LONG-TERM DEBT, Future Lease Pa

LONG-TERM DEBT, Future Lease Payments (Details) $ in Thousands	Oct. 31, 2018USD ($)
Lease payments in year one	$ 1,240
Lease payments in year two	1,191
Lease payments in year three	1,184
Lease payments in year four	1,175
Lease payments in year five	873
Thereafter	6,412
Total minimum lease payments	12,075
Less: amount representing interest	(2,718)
Present value of minimum lease payments	$ 9,357

LONG-TERM DEBT (Details Textual

LONG-TERM DEBT (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Debt Disclosure [Abstract]
Interest Rate	3.40%	2.40%
Credit Facility [Abstract]
Credit Facility, Current Borrowing Capacity	$ 1,300
Credit Facility, Expiration Date	Nov. 30, 2022
Line of Credit Facility Change in Borrowing Capacity	$ 350
Credit Facility, Maximum Borrowing Capacity	$ 1,650
Credit facility, interest rate description	Borrowings under the New Credit Facility accrue interest at the Company’s election of the Base Rate or the Eurocurrency Rate, plus in each case, the Applicable Rate (based on the Company’s Total Leverage Ratio). The Base Rate for any day is a fluctuating rate per annum equal to the highest of (i) the Prime Rate; (ii) the Federal Funds Rate plus .50%; and (iii) the Eurocurrency Rate for an Interest Period of one month plus 100 basis points. The Eurocurrency Rate is the rate per annum obtained by dividing LIBOR for the applicable Interest Period by a percentage equal to 1.00 minus the daily average Eurocurrency Reserve Rate for such Interest Period, as such capitalized terms are defined in the New Credit Facility.
Minimum [Member]
Credit Facility [Abstract]
Credit facility unused capacity, commitment fee percentage	0.125%
Maximum [Member]
Credit Facility [Abstract]
Credit facility unused capacity, commitment fee percentage	0.30%
Eurodollar [Member] | Minimum [Member]
Credit Facility [Abstract]
Credit Facility, Interest Rate, Increase (Decrease)	1.00%
Eurodollar [Member] | Maximum [Member]
Credit Facility [Abstract]
Credit Facility, Interest Rate, Increase (Decrease)	2.00%
Base Rate [Member] | Minimum [Member]
Credit Facility [Abstract]
Credit Facility, Interest Rate, Increase (Decrease)	0.00%
Base Rate [Member] | Maximum [Member]
Credit Facility [Abstract]
Credit Facility, Interest Rate, Increase (Decrease)	1.00%
Prior Credit Facility [Member]
Credit Facility [Abstract]
Credit Facility, Current Borrowing Capacity	$ 1,000
Foreign Line of Credit [Member]
Credit Facility [Abstract]
Credit Facility, Current Borrowing Capacity	100
Letter of Credit [Member]
Credit Facility [Abstract]
Credit Facility, Current Borrowing Capacity	$ 50

INCOME TAXES INCOME TAXES, Dome

INCOME TAXES INCOME TAXES, Domestic and Foreign Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Income Tax Disclosure [Abstract]
Domestic	$ 309,123	$ 264,420	$ 227,927
Foreign	47,163	33,540	29,123
Income before taxes and noncontrolling interests	$ 356,286	$ 297,960	$ 257,050

INCOME TAXES, Current and Defer

INCOME TAXES, Current and Deferred Expense Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Current:
Federal	$ 61,548	$ 85,047	$ 75,261
State	9,420	6,820	7,463
Foreign	12,608	9,529	7,370
Current income tax expense	83,576	101,396	90,094
Deferred:
Federal	(13,115)	(9,661)	(5,979)
State	1,578	(499)	(2,587)
Foreign	(1,439)	(936)	(628)
Deferred Income Tax Expense (Benefit)	(12,976)	(11,096)	(9,194)
Income tax expense	$ 70,600	$ 90,300	$ 80,900

INCOME TAXES, Rate Reconciliati

INCOME TAXES, Rate Reconciliation (Details)	1 Months Ended	2 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 21, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Federal statutory income tax rate	21.00%	35.00%	23.30%	35.00%	35.00%
State taxes, less applicable federal income tax reduction			2.90%	1.90%	1.70%
Discrete net tax benefit related to Tax Act			(3.40%)	0.00%	0.00%
Research and development tax credits			(2.00%)	(1.80%)	(2.70%)
Domestic production activities tax deduction			(0.80%)	(1.10%)	(1.30%)
Tax benefit related to stock option exercises (ASU 2016-09 adoption)			(0.50%)	(1.00%)	0.00%
Noncontrolling interests' share of income			0.30%	0.70%	0.70%
Tax-exempt (gains) losses on corporate-owned life insurance policies			(0.10%)	1.80%	0.10%
Other, net			0.50%	(0.20%)	(0.40%)
Effective tax rate			19.80%	30.30%	31.50%

INCOME TAXES, Deferred Tax Asse

INCOME TAXES, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017
Deferred tax assets:
Deferred compensation liability	$ 31,152	$ 47,093
Inventories	22,204	31,797
Share-based compensation	9,811	12,984
Bonus accrual	4,474	4,956
Customer rebates accrual	1,526	1,864
Vacation accrual	1,456	2,112
Deferred revenue	68	730
Other	7,084	9,230
Deferred Tax Assets, Gross	77,775	110,766
Deferred tax liabilities:
Goodwill and other intangible assets	(112,533)	(160,158)
Property, plant and equipment	(11,615)	(7,887)
Other	(271)	(1,747)
Total deferred tax liabilities	(124,419)	(169,792)
Net deferred tax liabilities	$ (46,644)	$ (59,026)

INCOME TAXES, Unrecognized Tax

INCOME TAXES, Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balances as of beginning of year	$ 2,040	$ 1,602
Increases related to current year tax positions	591	596
Increases related to prior year tax positions	20	0
Decreases related to prior year tax positions	0	(24)
Settlements	(394)	0
Lapse of statutes of limitations	(157)	(134)
Balances as of end of year	$ 2,100	$ 2,040

INCOME TAXES (Details Textuals)

INCOME TAXES (Details Textuals) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 21, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Income Tax Disclosure [Abstract]
Federal Statutory Income Tax Rate, Percent	21.00%	35.00%		23.30%	35.00%	35.00%
Remeasurement of Deferred Tax Liabilities for Change in Tax Rate				$ 16,500
Transition Tax Expense from Unremitted Earnings from Foreign Subsidiaries				$ 4,400
Effective Income Tax Rate, Continuing Operations				19.80%	30.30%	31.50%
Gross unrecognized tax benefits related to uncertain tax positions				$ 2,100	$ 2,040	$ 1,602
Unrecognized tax benefits that would impact effective tax rate				$ 1,700	$ 1,300
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense			$ 3,100

FAIR VALUE MEASUREMENTS, Assets

FAIR VALUE MEASUREMENTS, Assets and Liabilities, Measured on Recurring Basis (Details) - USD ($)	Oct. 31, 2018	Oct. 31, 2017
Assets [Abstract]
Deferred Compensation Plan Assets	$ 132,737,000	$ 122,874,000
Liabilities [Abstract]
Contingent consideration, liability	20,875,000	27,573,000
Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	9,482,000	9,654,000
Liabilities [Abstract]
Contingent consideration, liability	0	0
Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	123,255,000	113,220,000
Liabilities [Abstract]
Contingent consideration, liability	0	0
Fair Value, Inputs, Level 3 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	0	0
Liabilities [Abstract]
Contingent consideration, liability	20,875,000	27,573,000
Corporate Owned Life Insurance [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	123,255,000	113,220,000
Corporate Owned Life Insurance [Member] | Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	0	0
Corporate Owned Life Insurance [Member] | Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	123,255,000	113,220,000
Corporate Owned Life Insurance [Member] | Fair Value, Inputs, Level 3 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	0	0
Money Market Funds [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	3,560,000	3,972,000
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	3,560,000	3,972,000
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	0	0
Equity Securities [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	3,179,000	2,895,000
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	3,179,000	2,895,000
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	0	0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	0	0
Equity Funds [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	1,437,000	1,541,000
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	1,437,000	1,541,000
Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	0	0
Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	0	0
Other Defined Deferred Compensation Plan [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	1,306,000	1,246,000
Other Defined Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	1,306,000	1,246,000
Other Defined Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	0	0
Other Defined Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	$ 0	$ 0

FAIR VALUE MEASUREMENTS FAIR VA

FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS, Contingent Consideration Level 3 Valuation Inputs (Details) - Fair Value, Inputs, Level 3 [Member]	Oct. 31, 2018
Measurement Input, Long-term Revenue Growth Rate [Member] | FY 2017 Acquisition [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	(0.04)
Measurement Input, Long-term Revenue Growth Rate [Member] | FY 2017 Acquisition [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.07
Measurement Input, Long-term Revenue Growth Rate [Member] | FY 2016 Acquisition [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.04
Measurement Input, Long-term Revenue Growth Rate [Member] | FY 2016 Acquisition [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.13
Measurement Input, Long-term Revenue Growth Rate [Member] | FY 2015 Acquisition [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.10
Measurement Input, Long-term Revenue Growth Rate [Member] | FY 2015 Acquisition [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.13
Measurement Input, Discount Rate [Member] | FY 2017 Acquisition [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.063
Measurement Input, Discount Rate [Member] | FY 2016 Acquisition [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.048
Measurement Input, Discount Rate [Member] | FY 2015 Acquisition [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.008

FAIR VALUE MEASUREMENTS, Asse_2

FAIR VALUE MEASUREMENTS, Assets and Liabilities, Measured at Fair Value Using Unobservable Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Change in value of contingent consideration		$ 1,100	$ 3,063
Liabilities, Ending Balance	$ 20,875
Liabilities [Abstract]
Total liabilities	1,018,342	1,133,016
Fair Value, Inputs, Level 3 [Member]
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Liabilities, Opening Balance	27,573	18,881
Contingent consideration related to acquisition	(1,365)	13,797
Increase in accrued contingent consideration		1,100
Change in value of contingent consideration	(5,425)	(7,039)
Liabilities, Ending Balance		27,573	$ 18,881
Liabilities [Abstract]
Accrued Liabilities, Current	6,107
Other Liabilities, Noncurrent	14,768
Total liabilities	20,875
Fair Value, Inputs, Level 3 [Member] | Foreign Currency Gain (Loss) [Member]
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Change in Unrealized Gain (Loss)	$ 92	$ 834

FAIR VALUE MEASUREMENTS (Detail

FAIR VALUE MEASUREMENTS (Details Textuals) $ in Thousands, € in Millions	12 Months Ended
	Oct. 31, 2018USD ($)	Oct. 31, 2018EUR (€)	Oct. 31, 2017USD ($)	Oct. 31, 2016USD ($)	Oct. 31, 2018EUR (€)	Oct. 31, 2017EUR (€)
Business Acquisition, Contingent Consideration [Line Items]
Change in value of contingent consideration			$ 1,100	$ 3,063
Contingent consideration, liability	$ 20,875		27,573
Flight Support Group [Member] | FY 2015 Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Change in value of contingent consideration	5,100
Contingent consideration related to acquisition	1,800
Contingent consideration, liability	5,800		$ 12,600
Electronic Technologies Group [Member] | FY 2017 Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Amount of contingent purchase consideration, the company could be required to pay	20,000
Contingent consideration, liability	13,900
Electronic Technologies Group [Member] | FY 2016 Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Amount of contingent purchase consideration, the company could be required to pay	1,700
Change in value of contingent consideration	300
Contingent consideration, liability	1,200
Euro Member Countries, Euro | Flight Support Group [Member] | FY 2015 Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent Consideration Arrangements, Per Year Amount | €					€ 6.1
Change in value of contingent consideration | €		€ 4.4
Contingent consideration related to acquisition	$ 1,300
Contingent consideration, liability | €					€ 5.1	€ 10.8

SHAREHOLDERS' EQUITY (Details T

SHAREHOLDERS' EQUITY (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Jan. 31, 2018	Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, number of shares authorized to be repurchased (in shares)	4,886,353
Common Stock Dividend Percentage Rate		25.00%	25.00%	25.00%
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Paid for Tax Withholding for Share Based Compensation	332,140
Adjustments Related to Tax Withholding for Share-based Compensation	$ 23.9
Common Class A [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Paid for Tax Withholding for Share Based Compensation	18,145
Adjustments Related to Tax Withholding for Share-based Compensation	$ 1.1

SHARE-BASED COMPENSATION, Share

SHARE-BASED COMPENSATION, Share-based Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Shares Available for Grant [Roll Forward]
Opening Balance Outstanding Shares (Shares Available For Grant)	830	2,016	2,590
Shares approved by Shareholders (Shares Available for Grant)	5,000
Granted (Available for Grant)	(412)	(1,186)	(586)
Cancelled (Available for Grant)	24		12
Ending Balance Outstanding Shares (Shares Available For Grant)	4,612	830	2,016
Shares Outstanding [Roll Forward]
Outstanding (Shares Under Option)	7,297	6,520	6,514
Granted (Shares Under Option)	412	1,186	586
Exercised (Shares Under Option)	(1,285)	(409)	(568)
Cancelled (Shares Under Option)	(24)		(12)
Outstanding (Shares Under Option)	6,400	7,297	6,520
Weighted Average Exercise Price [Roll Forward]
Outstanding (in dollars per share)	$ 18.58	$ 14.23	$ 13.07
Granted (in dollars per share)	65.64	41.37	23.58
Exercised (in dollars per share)	10.54	15.27	10.45
Cancelled (in dollars per share)	28.85		18.62
Outstanding (in dollars per share)	$ 23.19	$ 18.58	$ 14.23
2012 Incentive Compensation Plan [Member]
Shares Available for Grant [Roll Forward]
Cancelled (Available for Grant)	(830)

SHARE-BASED COMPENSATION, Optio

SHARE-BASED COMPENSATION, Options Outstanding and Exercisable (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Number Outstanding (in shares)	6,400	7,297	6,520	6,514
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 23.19	$ 18.58	$ 14.23	$ 13.07
Outstanding Weighted Average Contractual Life (in years)	5 years
Outstanding Aggregated Intrinsic Value (in dollars)	$ 328,976
Number Exercisable (in shares)	4,357
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 15.17
Exercisable Weighted Average Contractual Life (in years)	3 years 6 months
Exercisable Aggregate Intrinsic Value (in dollars)	$ 262,053
Heico Common Stock [Member]
Number Outstanding (in shares)	2,955
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 23.48
Outstanding Weighted Average Contractual Life (in years)	4 years 4 months 24 days
Outstanding Aggregated Intrinsic Value (in dollars)	$ 178,327
Number Exercisable (in shares)	2,197
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 14.75
Exercisable Weighted Average Contractual Life (in years)	3 years
Exercisable Aggregate Intrinsic Value (in dollars)	$ 151,756
Common Class A [Member]
Number Outstanding (in shares)	3,445
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 22.94
Outstanding Weighted Average Contractual Life (in years)	5 years 6 months
Outstanding Aggregated Intrinsic Value (in dollars)	$ 150,649
Number Exercisable (in shares)	2,160
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 15.59
Exercisable Weighted Average Contractual Life (in years)	4 years 1 month 6 days
Exercisable Aggregate Intrinsic Value (in dollars)	$ 110,297

SHARE-BASED COMPENSATION, Infor

SHARE-BASED COMPENSATION, Information on Options Exercised (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Proceeds from stock option exercises	$ 4,031	$ 5,659	$ 5,924
Tax benefit from stock option exercises	2,162	3,087	868
Intrinsic value of stock option exercises	$ 75,152	$ 10,376	$ 9,751

SHARE-BASED COMPENSATION, Assum

SHARE-BASED COMPENSATION, Assumptions for Option Grants Fair Value Calculation (Details) - $ / shares	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Common Class A [Member]
Expected stock price volatility	27.69%	28.18%	32.52%
Risk-free interest rate	2.81%	2.06%	1.82%
Dividend yield	0.29%	0.31%	0.32%
Forfeiture rate	0.00%	0.00%	0.00%
Expected option life (years)	8 years	7 years	6 years
Weighted average fair value	$ 20.93	$ 12.47	$ 7.92
Heico Common Stock [Member]
Expected stock price volatility	31.00%	37.89%	39.63%
Risk-free interest rate	2.83%	2.44%	2.16%
Dividend yield	0.24%	0.26%	0.24%
Forfeiture rate	0.00%	0.00%	0.00%
Expected option life (years)	9 years	9 years	9 years
Weighted average fair value	$ 30	$ 21.36	$ 12.10

SHARE-BASED COMPENSATION (Detai

SHARE-BASED COMPENSATION (Details Textuals) - USD ($) shares in Thousands, $ in Millions	3 Months Ended	12 Months Ended
	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Shares approved by Shareholders (Shares Available for Grant)		5,000
Number Outstanding (in shares)		6,400	7,297	6,520	6,514
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		4,612	830	2,016	2,590
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		5 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
Pre-tax unrecognized compensation expense related to nonvested stock options		$ 26.9
Pre-tax unrecognized compensation expense related to nonvested stock options, expected to be recognized over a weighted average period (in years)		3 years 6 months
Fair value of stock options, Vested		$ 8.5	$ 5.3	$ 5.8
Common Class A [Member]
Number Outstanding (in shares)		3,445
Stock Option and Future Grants [Member]
Shares approved by Shareholders (Shares Available for Grant)		11,000
Number Outstanding (in shares)		6,400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		4,600
Employee Stock Option [Member]
Allocated Share-based Compensation Expense		$ 9.3	7.4	6.4
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense		$ 2.2	$ 2.8	$ 2.4
Accounting Standards Update 2016-09 [Member]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 3.1

EMPLOYEE RETIREMENT PLANS EMP_2

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Defined Contribution Plan Share-based Activity (Details) - shares shares in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Defined Contribution Plan Disclosure [Line Items]
Shares available for issuance, Opening Balance	398	491	28
Shares registered for issuance to the 401(k) Plan			586
Issuance of common stock to 401(k) Plan	(65)	(93)	(123)
Shares available for issuance, Ending Balance	333	398	491
Common Class A [Member]
Defined Contribution Plan Disclosure [Line Items]
Shares available for issuance, Opening Balance	398	491	28
Shares registered for issuance to the 401(k) Plan			586
Issuance of common stock to 401(k) Plan	(65)	(93)	(123)
Shares available for issuance, Ending Balance	333	398	491

EMPLOYEE RETIREMENT PLANS EMP_3

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Projected Benefit Obligation and Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Change in projected benefit obligation:
Projected benefit obligation, Opening balance	$ 14,000	$ 14,511
Actuarial gain	(749)	(156)
Interest cost	539	561	$ 613
Benefits paid	900	916
Projected benefit obligation, Ending balance	12,890	14,000	14,511
Change in plan assets:
Fair value of plan assets, Opening balance	11,070	10,510
Actual return on plan assets	(151)	1,048
Employer contributions	360	428
Benefits paid	(900)	(916)
Fair value of plan assets, Ending balance	10,379	11,070	$ 10,510
Funded status	$ 2,511	$ 2,930

EMPLOYEE RETIREMENT PLANS EMP_4

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Weighted Average Assumptions (Details)	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Weighted Average Discount Rate [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.49%	3.98%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.98%	3.99%	4.47%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.75%	6.75%	6.75%

EMPLOYEE RETIREMENT PLANS EMP_5

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Net Pension Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	$ 728	$ 688	$ 702
Interest cost	(539)	(561)	(613)
Amortization of unrealized loss	(17)	(46)	0
Net pension income	$ 172	$ 81	$ 89

EMPLOYEE RETIREMENT PLANS EMP_6

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Estimated Future Benefit Payments (Details) $ in Thousands	Oct. 31, 2018USD ($)
Year ending October 31,
Next Twelve Months	$ 930
Year Two	929
Year Three	897
Year Four	877
Year Five	869
Five Fiscal Years Thereafter	$ 4,329

EMPLOYEE RETIREMENT PLANS EMP_7

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Plan Assets Fair Value (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 10,379	$ 11,070	$ 10,510
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	10,379	11,070
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	5,276	5,382
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	5,276	5,382
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	5,006	5,593
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	5,006	5,593
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Money Market Funds and Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	97	95
Money Market Funds and Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	97	95
Money Market Funds and Cash [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Money Market Funds and Cash [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 0	$ 0

EMPLOYEE RETIREMENT PLANS EMP_8

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Actual and Targeted Asset Allocations (Details)	Oct. 31, 2018	Oct. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	100.00%	100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%	100.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	51.00%	49.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50.00%	50.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	48.00%	50.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50.00%	50.00%
Money Market Funds and Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	1.00%	1.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%	0.00%

EMPLOYEE RETIREMENT PLANS (Deta

EMPLOYEE RETIREMENT PLANS (Details Textuals) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Defined contribution plan partcipants employees range maximum	6.00%
Defined contribution plan, vesting of employee contribution and cash dividends, percent	100.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 8,000	$ 7,800	$ 7,000
Liability, Defined Benefit Plan, Noncurrent	(2,500)	(2,900)
Defined Benefit Plan, Actuarial Gain (Loss) before Tax	(100)	500
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax	100	$ 200
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	1,800
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 1,000
Maximum [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	50.00%

REDEEMABLE NONCONTROLLING INT_3

REDEEMABLE NONCONTROLLING INTERESTS REDEEMABLE NONCONTROLLING INTERESTS (Details)	12 Months Ended
	Oct. 31, 2018
Electronic Technologies Group [Member] | Subsidiary One [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Oct. 31, 2005
Percentage of interest acquired in the subsidiary	95.90%
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2019	[1]
Put Rights Purchase Period	4 years	[2]
Electronic Technologies Group [Member] | Subsidiary Four [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Oct. 31, 2009
Percentage of interest acquired in the subsidiary	82.50%
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2019	[1]
Put Rights Purchase Period	1 year
Electronic Technologies Group [Member] | Subsidiary Five [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Oct. 31, 2012
Percentage of interest acquired in the subsidiary	78.00%
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2019	[1]
Put Rights Purchase Period	2 years
Electronic Technologies Group [Member] | Subsidiary Ten [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Oct. 31, 2015
Percentage of interest acquired in the subsidiary	80.10%
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2020
Put Rights Purchase Period	2 years
Electronic Technologies Group [Member] | Subsidiary Thirteen [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Oct. 31, 2018
Percentage of interest acquired in the subsidiary	85.00%
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2021
Put Rights Purchase Period	1 year
Flight Support Group [Member] | Subsidiary Two [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Oct. 31, 2006
Percentage of interest acquired in the subsidiary	80.10%
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2019	[1]
Put Rights Purchase Period	4 years
Flight Support Group [Member] | Subsidiary Three [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Oct. 31, 2008
Percentage of interest acquired in the subsidiary	82.30%
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2019	[1]
Put Rights Purchase Period	5 years
Flight Support Group [Member] | Subsidiary Six [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Oct. 31, 2012
Percentage of interest acquired in the subsidiary	84.00%
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2019	[1]
Put Rights Purchase Period	4 years
Flight Support Group [Member] | Subsidiary Seven [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Oct. 31, 2012
Percentage of interest acquired in the subsidiary	80.10%
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2019	[1]
Put Rights Purchase Period	4 years
Flight Support Group [Member] | Subsidiary Eight [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Oct. 31, 2015
Percentage of interest acquired in the subsidiary	80.00%
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2019
Put Rights Purchase Period	4 years
Flight Support Group [Member] | Subsidiary Nine [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Oct. 31, 2015
Percentage of interest acquired in the subsidiary	80.10%
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2020
Put Rights Purchase Period	4 years
Flight Support Group [Member] | Subsidiary Eleven [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Oct. 31, 2015
Percentage of interest acquired in the subsidiary	80.10%
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2022
Put Rights Purchase Period	4 years
Flight Support Group [Member] | Subsidiary Twelve [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Oct. 31, 2017
Percentage of interest acquired in the subsidiary	80.10%
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2022
Put Rights Purchase Period	2 years	[3]
[1]	(1) Currently puttable
[2]	(2) A portion is to be purchased in a lump sum
[3]	(3)

REDEEMABLE NONCONTROLLING INT_4

REDEEMABLE NONCONTROLLING INTERESTS (Details Textuals) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Redeemable Noncontrolling Interests (Textuals) [Abstract]
Management's estimate of the aggregate redemption amount of all put rights	$ 132,046	$ 131,123
Estimated Redemption Amount of equity interest redeemable at fair value	83,500
Estimated Redemption Amount of equity interest redeemable based on a multiple of future earnings	48,500
Business Acquisition [Line Items]
Payments For Repurchase Of Redeemable Noncontrolling Interest	0	(3,848)	$ (3,599)
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Aggregate Redemption Amount Puttable	61,300
Potential Redemption Amount Payable	$ 27,700
FY 2011 Acquisition [Member] | Flight Support Group [Member]
Business Acquisition [Line Items]
Percentage of interest acquired in the subsidiary	19.90%
Payments For Repurchase Of Redeemable Noncontrolling Interest		$ (3,800)	$ (3,600)
Subsidiary One [Member] | Electronic Technologies Group [Member]
Business Acquisition [Line Items]
Percentage of interest acquired in the subsidiary	95.90%
Subsidiary Two [Member] | Flight Support Group [Member]
Business Acquisition [Line Items]
Percentage of interest acquired in the subsidiary	80.10%
Subsidiary Three [Member] | Flight Support Group [Member]
Business Acquisition [Line Items]
Percentage of interest acquired in the subsidiary	82.30%
Subsidiary Four [Member] | Electronic Technologies Group [Member]
Business Acquisition [Line Items]
Percentage of interest acquired in the subsidiary	82.50%
Subsidiary Five [Member] | Electronic Technologies Group [Member]
Business Acquisition [Line Items]
Percentage of interest acquired in the subsidiary	78.00%
Subsidiary Six [Member] | Flight Support Group [Member]
Business Acquisition [Line Items]
Percentage of interest acquired in the subsidiary	84.00%
FY 2011 Acquisition [Member] | FY 2011 Acquisition [Member] | Flight Support Group [Member]
Business Acquisition [Line Items]
Percentage of company total ownership interest	100.00%

NET INCOME PER SHARE ATTRIBUT_3

NET INCOME PER SHARE ATTRIBUTABLE TO HEICO SHAREHOLDERS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Numerator:
Net income attributable to HEICO	$ 67,377	$ 67,086	$ 59,618	$ 65,152	$ 53,674	$ 45,698	$ 45,686	$ 40,927	$ 259,233	$ 185,985	$ 156,192
Denominator:
Weighted average common shares outstanding - basic									132,543	131,703	130,948
Effect of dilutive stock options									4,153	3,885	2,197
Weighted Average Number of Shares Outstanding, Diluted									136,696	135,588	133,145
Earnings Per Share, Basic	$ 0.51	$ 0.51	$ 0.45	$ 0.49	$ 0.41	$ 0.35	$ 0.35	$ 0.31	$ 1.96	$ 1.41	$ 1.19
Earnings Per Share, Diluted	$ 0.49	$ 0.49	$ 0.44	$ 0.48	$ 0.39	$ 0.34	$ 0.34	$ 0.30	$ 1.90	$ 1.37	$ 1.17
Anti-dilutive stock options excluded									512	799	1,133

QUARTERLY FINANCIAL INFORMATI_3

QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Net sales:
Net sales	$ 476,884	$ 465,825	$ 430,602	$ 404,410	$ 421,224	$ 391,500	$ 368,657	$ 343,432	$ 1,777,721	$ 1,524,813	$ 1,376,258
Gross profit:
Gross profit	186,458	181,609	167,857	154,791	160,029	148,897	140,382	125,417
Net income from consolidated operations:
Net income from consolidated operations	74,081	73,899	66,011	71,695	59,087	51,475	50,833	46,265	285,686	207,660	176,150
Net income attributable to HEICO:
Net income attributable to HEICO	$ 67,377	$ 67,086	$ 59,618	$ 65,152	$ 53,674	$ 45,698	$ 45,686	$ 40,927	$ 259,233	$ 185,985	$ 156,192
Basic:
Basic (in dollars per share)	$ 0.51	$ 0.51	$ 0.45	$ 0.49	$ 0.41	$ 0.35	$ 0.35	$ 0.31	$ 1.96	$ 1.41	$ 1.19
Diluted:
Diluted (in dollars per share)	$ 0.49	$ 0.49	$ 0.44	$ 0.48	$ 0.39	$ 0.34	$ 0.34	$ 0.30	$ 1.90	$ 1.37	$ 1.17

QUARTERLY FINANCIAL INFORMATI_4

QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details Textuals) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Remeasurement of Deferred Tax Liabilities for Change in Tax Rate, Net	$ 11,900								$ 11,900
Remeasurement of Deferred Tax Liabilities for Change in Tax Rate, Net, Per Share	$ 0.09								$ 0.09
Weighted Average Number of Shares Outstanding, Diluted									136,696,000	135,588,000	133,145,000
Net income attributable to HEICO	$ 67,377	$ 67,086	$ 59,618	$ 65,152	$ 53,674	$ 45,698	$ 45,686	$ 40,927	$ 259,233	$ 185,985	$ 156,192
Earnings Per Share, Basic	$ 0.51	$ 0.51	$ 0.45	$ 0.49	$ 0.41	$ 0.35	$ 0.35	$ 0.31	$ 1.96	$ 1.41	$ 1.19
Earnings Per Share, Diluted	$ 0.49	$ 0.49	$ 0.44	$ 0.48	$ 0.39	$ 0.34	$ 0.34	$ 0.30	$ 1.90	$ 1.37	$ 1.17
Accounting Standards Update 2016-09 [Member]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense								$ 3,100
Weighted Average Number of Shares Outstanding, Diluted								1,220,000
Net income attributable to HEICO								$ 2,600
Earnings Per Share, Basic								$ 0.02
Earnings Per Share, Diluted								$ 0.01

OPERATING SEGMENTS (Details)

OPERATING SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items]
Net sales	$ 476,884	$ 465,825	$ 430,602	$ 404,410	$ 421,224	$ 391,500	$ 368,657	$ 343,432	$ 1,777,721	$ 1,524,813	$ 1,376,258
Depreciation									23,239	21,878	20,361
Amortization									53,952	42,945	39,916
Operating income									376,245	306,658	265,345
Capital expenditures									41,871	25,998	30,863
Total assets	2,653,396				2,512,431				2,653,396	2,512,431	1,998,412
Flight Support Group [Member]
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items]
Net sales									1,097,937	967,540	875,870
Depreciation									13,322	13,042	12,113
Amortization									19,530	18,026	16,590
Operating income									206,623	179,278	163,427
Capital expenditures									13,074	15,665	18,434
Total assets	1,093,858				1,042,925				1,093,858	1,042,925	877,672
Electronic Technologies Group [Member]
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items]
Net sales									701,827	574,261	511,272
Depreciation									9,225	8,609	8,030
Amortization									33,339	24,167	22,664
Operating income									204,508	157,451	126,031
Capital expenditures									9,531	10,100	11,962
Total assets	1,391,997				1,339,363				1,391,997	1,339,363	1,015,696
Other Primarily Corporate and Inter Segment [Member]
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items]
Depreciation									692	227	218
Amortization									1,083	752	662
Operating income									(34,886)	(30,071)	(24,113)
Capital expenditures									19,266	233	467
Total assets	$ 167,541				$ 130,143				167,541	130,143	105,044
Consolidation, Eliminations [Member] | Other Primarily Corporate and Inter Segment [Member]
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items]
Net sales									$ (22,043)	$ (16,988)	$ (10,884)

OPERATING SEGMENTS OPERATING SE

OPERATING SEGMENTS OPERATING SEGMENTS, Information by Product Line (Details) - USD ($) $ in Thousands

3 Months Ended

12 Months Ended

Oct. 31, 2018

Jul. 31, 2018

Apr. 30, 2018

Jan. 31, 2018

Oct. 31, 2017

Jul. 31, 2017

Apr. 30, 2017

Jan. 31, 2017

Oct. 31, 2018

Oct. 31, 2017

Oct. 31, 2016

Product Information [Line Items]

Net sales

$ 476,884

$ 465,825

$ 430,602

$ 404,410

$ 421,224

$ 391,500

$ 368,657

$ 343,432

$ 1,777,721

$ 1,524,813

$ 1,376,258

Flight Support Group [Member]

Product Information [Line Items]

Net sales

1,097,937

967,540

875,870

Flight Support Group [Member] | Aftermarket Replacement Parts [Member]

Product Information [Line Items]

Net sales

[1]

582,562

489,644

405,108

Flight Support Group [Member] | Repair and Overhaul Parts and Services [Member]

Product Information [Line Items]

Net sales

[2]

286,454

270,482

251,357

Flight Support Group [Member] | Specialty Products [Member]

Product Information [Line Items]

Net sales

[3]

228,921

207,414

219,405

Electronic Technologies Group [Member]

Product Information [Line Items]

Net sales

701,827

574,261

511,272

Electronic Technologies Group [Member] | Electronic Components for Defense, Space and Aerospace [Member]

Product Information [Line Items]

Net sales

[4]

547,088

420,991

371,297

Electronic Technologies Group [Member] | Other Electronic Components [Member]

Product Information [Line Items]

Net sales

[5]

154,739

153,270

139,975

Consolidation, Eliminations [Member] | Other Primarily Corporate and Inter Segment [Member]

Product Information [Line Items]

Net sales

$ (22,043)

$ (16,988)

$ (10,884)

[1]

(1) Includes various jet engine and aircraft component replacement parts.

[2]

(2) Includes primarily the sale of parts consumed in various repair and overhaul services on selected jet engine and aircraft components, avionics, instruments, composites and flight surfaces of commercial and military aircraft.

[3]

(3) Includes primarily the sale of specialty components such as thermal insulation blankets, renewable/reusable insulation systems, advanced niche components, complex composite assemblies, and expanded foil mesh.

[4]

(4) Includes various component parts such as electro-optical infrared simulation and test equipment, electro-optical laser products, electro-optical, microwave and other power equipment, high-speed interface products, power conversion products, underwater locator beacons, emergency locator transmission beacons, traveling wave tube amplifiers, microwave power modules, three-dimensional microelectronic and stacked memory products, crashworthy and ballistically self-sealing auxiliary fuel systems, radio frequency (RF) and microwave amplifiers, transmitters and receivers, high performance communications and electronic intercept receivers and tuners and high performance active antenna systems.

[5]

(5) Includes various component parts such as electromagnetic and radio interference shielding, high voltage interconnection devices, high voltage advanced power electronics, harsh environment connectivity products and custom molded cable assemblies.

OPERATING SEGMENTS (Details 2)

OPERATING SEGMENTS (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 476,884	$ 465,825	$ 430,602	$ 404,410	$ 421,224	$ 391,500	$ 368,657	$ 343,432	$ 1,777,721	$ 1,524,813	$ 1,376,258
Property, Plant and Equipment, Net	154,739				129,883				154,739	129,883	121,611
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									1,127,998	1,007,491	904,670
Property, Plant and Equipment, Net	124,225				97,367				124,225	97,367	94,889
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									649,723	517,322	471,588
Property, Plant and Equipment, Net	$ 30,514				$ 32,516				$ 30,514	$ 32,516	$ 26,722

COMMITMENTS AND CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	Oct. 31, 2018USD ($)
Year One	$ 14,961
Year Two	14,991
Year Three	14,147
Year Four	12,546
Year Five	7,334
Thereafter	18,007
Total minimum lease commitments	$ 81,986

COMMITMENTS AND CONTINGENCIES_3

COMMITMENTS AND CONTINGENCIES (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balances as of beginning of year	$ 2,921	$ 3,351
Accruals for warranties	2,720	2,254
Acquired warranty liabilities	320	0
Warranty claims settled	(2,655)	(2,684)
Balances as of end of year	$ 3,306	$ 2,921

COMMITMENTS AND CONTINGENCIES_4

COMMITMENTS AND CONTINGENCIES (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Total rent expense charged to operations for operating leases	$ 17.5	$ 15.6	$ 14.7
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 4.3

SUPPLEMENTAL DISCLOSURES OF C_3

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Cash paid for income taxes	$ 90,488	$ 95,851	$ 87,486
Cash received from income tax refunds	(1,510)	(2,953)	(1,906)
Cash paid for interest	19,233	9,631	8,288
Additional purchase consideration		220
Additional purchase consideration	(407)		0
Property, plant and equipment acquired through capital lease obligations	7,166	37	1,111
Other Acquisitions [Member]
Contingent purchase consideration	$ 0	$ (13,797)	$ (1,225)

SUBSEQUENT EVENT SUBSEQUENT E_2

SUBSEQUENT EVENT SUBSEQUENT EVENT (Details Textual) - Subsequent Event [Member] - Electronic Technologies Group [Member]	1 Months Ended
	Nov. 30, 2018
SSP [Member]
Subsequent Event [Line Items]
Subsequent Event, Description	In November 2018, the Company, through HEICO Electronic, acquired all of the stock of Specialty Silicone Products, Inc. ("SSP"). SSP designs and manufactures silicone material for a variety of demanding applications, used in aerospace, defense, research, oil and gas, testing, pharmaceuticals and other markets. The purchase price of this acquisition was paid in cash principally using proceeds from the Company's revolving credit facility and the total consideration for the acquisition is not material or significant to the Company’s consolidated financial statements.
APEX [Member]
Subsequent Event [Line Items]
Subsequent Event, Description	In November 2018, the Company, through HEICO Electronic, acquired 93% of the stock of Apex Micotechnology, Inc. ("Apex"). Apex designs and manufactures precision power analog monolithic, hybrid and open frame components for a certain wide range of aerospace, defense, industrial, measurement, medical and test applications. The purchase price of this acquisition was paid in cash using proceeds from the Company's revolving credit facility and the total consideration for the acquisition is not material or significant to the Company’s consolidated financial statements.

VALUATION AND QUALIFYING ACCO_2

VALUATION AND QUALIFYING ACCOUNTS VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Opening Balance		$ 3,006	$ 3,159	$ 2,038
Valuation Allowances and Reserves, Charged to Cost and Expense		492	7	390
SEC Schedule, 12-09, Valuation Allowances and Reserves, Addition, Recovery	[1]	(13)
Valuation Allowances and Reserves, Charged to Other Accounts	[1]		298	973
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[2]	(227)	(458)	(242)
Valuation Allowances and Reserves, Ending Balance		3,258	3,006	3,159
SEC Schedule, 12-09, Reserve, Inventory [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Opening Balance		92,148	81,449	69,654
Valuation Allowances and Reserves, Charged to Cost and Expense		9,227	6,284	10,270
Valuation Allowances and Reserves, Charged to Other Accounts	[3]	1,270	6,264	6,268
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[4]	(7,254)	(1,849)	(4,743)
Valuation Allowances and Reserves, Ending Balance		$ 95,391	$ 92,148	$ 81,449
[1]	(a)Principally additions from acquisitions and foreign currency translation adjustments.
[2]	(b)Principally write-offs of uncollectible accounts receivable, net of recoveries.
[3]	(a)Principally additions from acquisitions and foreign currency translation adjustments
[4]	(b)Principally write-offs of slow-moving, obsolete or damaged inventory