HEICO (HEI) 10-K 21 Dec 17 2017 FY Annual report Financial data

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - USD ($)	12 Months Ended
	Oct. 31, 2017	Dec. 19, 2017	Apr. 30, 2017
Document Entity Information [Abstract]
Document Fiscal Period Focus	FY
Document Period End Date	Oct. 31, 2017
Document Fiscal Year Focus	2,017
Amendment Flag	false
Entity Well-Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 5,092,102,000
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
City Area Code	954
Local Phone Number	987-4000
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
Common Class A [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		50,728,853
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		33,776,523
Trading Symbol	hei
Entity Listing, Par Value Per Share	$ 0.01

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016
Current assets:
Cash and cash equivalents	$ 52,066	$ 42,955
Accounts receivable, net	222,456	202,227
Inventories, net	343,628	286,302
Prepaid expenses and other current assets	13,742	11,674
Total current assets	631,892	543,158
Property, plant and equipment, net	129,883	121,611
Goodwill	1,081,306	865,717
Intangible assets, net	538,081	366,863
Deferred income taxes	0	407
Other assets	131,269	100,656
Total assets	2,512,431	1,998,412
Current liabilities:
Current maturities of long-term debt	451	411
Trade accounts payable	89,724	73,335
Accrued expenses and other current liabilities	147,612	136,053
Income taxes payable	11,650	4,622
Total current liabilities	249,437	214,421
Long-term debt, net of current maturities	673,528	457,814
Deferred income taxes	59,026	64,899
Other long-term liabilities	151,025	114,061
Total liabilities	1,133,016	851,195
Commitments and contingencies
Redeemable noncontrolling interests	131,123	99,512
Shareholders' equity:
Common Stock	338	270
Capital in excess of par value	326,544	306,328
Deferred compensation obligation	3,118	2,460
HEICO stock held by irrevocable trust	(3,118)	(2,460)
Accumulated other comprehensive (loss) income	(10,556)	(25,326)
Retained earnings	844,247	681,704
Total HEICO shareholders' equity	1,161,080	963,379
Noncontrolling interests	87,212	84,326
Total shareholders' equity	1,248,292	1,047,705
Total liabilities and equity	2,512,431	1,998,412
Common Class A [Member]
Shareholders' equity:
Common Stock	$ 507	$ 403

CONSOLIDATED BALANCE SHEETS _PA

CONSOLIDATED BALANCE SHEETS [PARENTHETICAL] - $ / shares shares in Thousands	Oct. 31, 2017	Oct. 31, 2016
Common stock, par value (in dollar per share)	$ 0.01	$ 0.01
Common stock, shares authorized	75,000	75,000
Common stock, shares issued	33,777	33,715
Common stock, shares outstanding	33,777	33,715
Common Class A [Member]
Common stock, par value (in dollar per share)	$ 0.01	$ 0.01
Common stock, shares authorized	75,000	75,000
Common stock, shares issued	50,705	50,396
Common stock, shares outstanding	50,705	50,396

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Net sales	$ 1,524,813	$ 1,376,258	$ 1,188,648
Operating costs and expenses:
Cost of sales	950,088	860,766	754,469
Selling, general and administrative expenses	268,067	250,147	204,523
Total operating costs and expenses	1,218,155	1,110,913	958,992
Operating income	306,658	265,345	229,656
Interest expense	(9,790)	(8,272)	(4,626)
Other income	1,092	(23)	(66)
Income before taxes and noncontrolling interests	297,960	257,050	224,964
Income tax expense	90,300	80,900	71,400
Net income from consolidated operations	207,660	176,150	153,564
Less: Net income attributable to noncontrolling interests	21,675	19,958	20,200
Net income attributable to HEICO	$ 185,985	$ 156,192	$ 133,364
Net income per share attributable to HEICO shareholders:
Basic (in dollars per share)	$ 2.21	$ 1.86	$ 1.60
Diluted (in dollars per share)	$ 2.14	$ 1.83	$ 1.57
Weighted average number of common shares outstanding:
Basic (in shares)	84,290	83,807	83,425
Diluted (in shares)	86,776	85,213	84,764

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Net income from consolidated operations	$ 207,660	$ 176,150	$ 153,564
Other comprehensive (loss) income:
Foreign currency translation adjustments	15,346	353	(16,880)
Unrealized (loss) gain on defined benefit pension plan, net of tax	321	(661)	(771)
Amortization of unrealized loss on defined benefit pension plan, net of tax	(29)	0	0
Total other comprehensive (loss) income	15,696	(308)	(17,651)
Comprehensive income from consolidated operations	223,356	175,842	135,913
Less: Net income attributable to noncontrolling interests	21,675	19,958	20,200
Less: Foreign currency translation adjustments attributable to noncontrolling interests	926	(62)	(860)
Comprehensive income attributable to noncontrolling interests	22,601	19,896	19,340
Comprehensive income attributable to HEICO	$ 200,755	$ 155,946	$ 116,573

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, 2014			$ 268	$ 397	$ 269,351	$ 1,138	$ (1,138)	$ (8,289)	$ 437,757	$ 75,135	$ 774,619
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 116,573							(16,791)	133,364
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	19,340	$ 6,534								12,806
Comprehensive Income (Loss)	135,913										129,379
Cash dividends									(9,343)		(9,343)
Issuance of common stock to HEICO Savings and Investment Plan			1	1	5,752						5,754
Share-based compensation expense					6,048						6,048
Proceeds from stock option exercises				2	3,671						3,673
Tax benefit from stock option exercises					1,402						1,402
Distributions to noncontrolling interests		(5,166)								(4,533)	(4,533)
Adjustments to redemption amount of redeemable noncontrolling interests		13,724							(13,724)		(13,724)
Deferred Compensation Obligation						645
Stock Held During Period Value Deferred Compensation Obligation							(645)
Adjustments to Additional Paid in Capital, Other					(4)
Stockholders' Equity, Other											(4)
Balances at Oct. 31, 2015			269	400	286,220	1,783	(1,783)	(25,080)	548,054	83,408	893,271
Redeemable noncontrolling interests at Oct. 31, 2014		39,966
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Redeemable Noncontrolling Interest	19,340	6,534								12,806
Distributions to noncontrolling interests		(5,166)								(4,533)	(4,533)
Adjustments to redemption amount of redeemable noncontrolling interests		13,724							(13,724)		(13,724)
Noncontrolling interests assumed related to acquisition		36,224
Redeemable noncontrolling interests at Oct. 31, 2015		91,282
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 Savings and Investment Plan			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)
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	1,047,705		270	403	306,328	2,460	(2,460)	(25,326)	681,704	84,326	1,047,705
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	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 Savings and Investment Plan					7,517						7,517
Share-based compensation expense					7,415						7,415
Proceeds from stock option exercises				3	5,656						5,659
Distributions to noncontrolling interests		(10,323)								(8,078)	(8,078)
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)
Adjustment from the Redemption of Noncontrolling Interests in a Partnership									194		194
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
Distributions to noncontrolling interests		(10,323)								$ (8,078)	(8,078)
Acquisitions of noncontrolling interests		(3,848)
Adjustments to redemption amount of redeemable noncontrolling interests		10,806							$ (10,806)		$ (10,806)
Noncontrolling interests assumed related to acquisition		23,339
Redeemable noncontrolling interests at Oct. 31, 2017	$ 131,123	$ 131,123

CONSOLIDATED STATEMENTS OF SHA7

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY [PARENTHETICAL] - $ / shares	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Cash dividends per share (in dollars per share)	$ 0.152	$ 0.128	$ 0.112

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Operating Activities:
Net income from consolidated operations	$ 207,660	$ 176,150	$ 153,564
Adjustments to reconcile net income from consolidated operations to net cash provided by operating activities:
Depreciation and amortization	64,823	60,277	47,907
Employer contributions to HEICO Savings and Investment Plan	7,768	7,020	6,125
Share-based compensation expense	7,415	6,434	6,048
Accrued contingent consideration	1,100	3,063	293
Foreign Currency Transaction Loss, before Tax	3,347	13	(3,704)
Deferred income tax benefit	(11,096)	(9,194)	(7,080)
Tax benefit from stock option exercises	0	868	1,402
Excess tax benefit from stock option exercises	0	(881)	(1,402)
Payment of contingent consideration		(631)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	2,846	(15,955)	(22,572)
Inventories	(21,204)	(14,421)	(10,187)
Prepaid expenses and other current assets	134	(2,356)	1,433
Trade accounts payable	6,386	4,074	3,169
Accrued expenses and other current liabilities	1,794	35,279	(883)
Income taxes payable	6,071	1,443	373
Other	(2,159)	(1,999)	(1,623)
Net cash provided by operating activities	274,885	249,184	172,863
Investing Activities:
Acquisitions, net of cash acquired	(418,265)	(263,811)	(166,784)
Capital expenditures	(25,998)	(30,863)	(18,249)
Other	(552)	(2,942)	(973)
Net cash used in investing activities	(444,815)	(297,616)	(186,006)
Financing Activities:
Borrowings on revolving credit facility	404,000	260,000	173,696
Payments on revolving credit facility	(190,877)	(170,000)	(132,000)
Distributions to noncontrolling interests	(18,401)	(19,017)	(9,699)
Cash dividends paid	(12,807)	(10,724)	(9,343)
Payment of contingent consideration	(7,039)	(6,329)
Acquisitions of noncontrolling interests	(3,848)	(3,599)	0
Proceeds from stock option exercises	5,659	5,924	3,673
Excess tax benefit from stock option exercises		881	1,402
Revolving credit facility issuance costs	(270)
Other	(545)	(364)	(393)
Net cash (used in) provided by financing activities	175,872	56,772	27,336
Effect of exchange rate changes on cash	3,169	1,012	(819)
Net increase (decrease) in cash and cash equivalents	9,111	9,352	13,374
Cash and cash equivalents at beginning of year	42,955	33,603	20,229
Cash and cash equivalents at end of year	$ 52,066	$ 42,955	$ 33,603

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Oct. 31, 2017
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, and a wholly owned subsidiary of HEICO Electronic consolidates a subsidiary which is 78% owned. See Note 11, Redeemable Noncontrolling Interests. All intercompany balances and transactions are eliminated. Stock Split In 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 split was effected as of April 19, 2017 in the form of a 25% stock dividend distributed to shareholders of record as of April 7, 2017. All applicable share and per share information has been adjusted retrospectively to give effect to the fiscal 2017 5-for-4 stock split. 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 market, 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 depreciated over the following estimated useful lives: Buildings and improvements 10 to 40 years Leasehold improvements 2 to 20 years Machinery and equipment 3 to 10 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 2017 or 2015 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 6 to 15 years Intellectual property 7 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 3% , 3% and 4% in fiscal 2017, 2016 and 2015, 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 2017, 2016 or 2015. 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. 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 Accounting Standards Update ("ASU") 2014-09, “Revenue from Contracts with Customers,” 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. Early adoption in the year preceding the effective date is permitted. ASU 2014-09 shall be applied either retrospectively to each prior reporting period presented or retrospectively with the cumulative effect of initially applying ASU 2014-09 recognized at the date of initial application. The Company is currently evaluating which transition method it will elect. In addition, the Company is currently identifying its various revenue streams and reviewing certain underlying customer contracts to determine the effect the adoption of this guidance will have on its consolidated results of operations, financial position and cash flows. 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. Under current guidance, inventories are measured at the lower of cost or market. ASU 2015-11 must be applied prospectively and is effective for fiscal years and interim reporting periods within those years beginning after December 15, 2016, or in fiscal 2018 for HEICO. The Company is currently evaluating the effect, if any, the adoption of this guidance will have on its consolidated results of operations, financial position and cash flows. In November 2015, the FASB issued ASU 2015-17, "Balance Sheet Classification of Deferred Taxes," which requires that all deferred tax assets and liabilities be classified as noncurrent in the balance sheet. The Company adopted ASU 2015-17 on a retrospective basis in the fourth quarter of fiscal 2017, resulting in a reclassification of $41.1 million in current deferred tax assets to noncurrent deferred tax liabilities in the Company's Consolidated Balance Sheet as of October 31, 2016. 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 requires a modified retrospective transition approach and provides certain optional transition relief. 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 March 2016, the FASB issued ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting," which simplifies several aspects related to accounting for share-based payment transactions. Under ASU 2016-09, all excess tax benefits and tax deficiencies are to be recognized in the statement of operations as a component of income tax expense rather than as capital in excess of par value. The Company adopted ASU 2016-09 in the first quarter of fiscal 2017 resulting in the recognition of a $3.1 million discrete income tax benefit, which, net of noncontrolling interests, increased net income attributable to HEICO by $2.6 million . Additionally, ASU 2016-09 requires excess tax benefits and deficiencies to be prospectively excluded from the assumed future proceeds in the calculation of diluted shares, which increased the Company's weighted average number of diluted common shares outstanding by 781,000 for fiscal 2017. Further, ASU 2016-09 requires excess tax benefits be presented within the statement of cash flows as an operating activity rather than as a financing activity. The Company adopted this change on a prospective basis, which resulted in a $3.1 million increase in cash provided by operating activities and a $3.1 million decrease in cash provided by financing activities in fiscal 2017. 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. ASU 2016-15 provides guidance on eight specific cash flow classification issues including contingent consideration payments made after a business combination, proceeds from corporate-owned life insurance policies and distributions received from equity method investees. ASU 2016-15 is effective for fiscal years and interim reporting periods within those years beginning after December 15, 2017, or in fiscal 2019 for HEICO. Early adoption is permitted. ASU 2016-15 requires a retrospective transition approach for all periods presented. The Company is currently evaluating the effect the adoption of this guidance will have on its consolidated statement of cash flows. In January 2017, the FASB issued ASU 2017-04, "Simplifying the Test for Goodwill Impairment," which is intended to simplify the current test for goodwill impairment by eliminating the second step in which the implied value of a reporting unit is calculated when the carrying value of the reporting unit exceeds its fair value. Under ASU 2017-04, goodwill impairment should be recognized for the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. ASU 2017-04 must be applied prospectively and is effective for any annual or interim goodwill impairment test in fiscal years beginning after December 15, 2019, or in fiscal 2021 for HEICO. Early adoption is permitted. The Company does not expect the adoption of this guidance to have a material impact on its consolidated results of operations, financial position and cash flows.

ACQUISITIONS

ACQUISITIONS	12 Months Ended
	Oct. 31, 2017
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 220 Total consideration $330,649 As noted in the table above, the total consideration includes an accrual of $13.8 million 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 $160,903 Customer relationships 100,000 Intellectual property 39,000 Trade name 20,000 Accounts receivable 6,115 Inventories 5,923 Property, plant and equipment 1,246 Other assets 208 Total assets acquired, excluding cash 333,395 Liabilities assumed: Accounts payable 1,290 Accrued expenses 1,456 Total liabilities assumed 2,746 Net assets acquired, excluding cash $330,649 The allocation of the total consideration to the tangible and identifiable intangible assets acquired and liabilities 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 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 Year ended October 31, 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 $2.36 $1.97 Diluted $2.29 $1.94 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. The following table presents unaudited pro forma financial information for fiscal 2015 as if the acquisition of Robertson had occurred as of November 1, 2014 (in thousands, except per share data): Year ended October 31, 2015 Net sales $1,275,926 Net income from consolidated operations $162,645 Net income attributable to HEICO $142,445 Net income per share attributable to HEICO shareholders: Basic $1.71 Diluted $1.68 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, 2014. 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, the reclassification of acquisition costs associated with the purchase of Robertson from fiscal 2016 to fiscal 2015, and inventory purchase accounting adjustments charged to cost of sales as the inventory is sold. 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 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 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. In August 2015 , the Company, through HEICO Flight Support Corp., acquired all of the stock of Astroseal Products Mfg. Corporation (“Astroseal”). Astroseal manufactures expanded foil mesh, which is integrated into composite aerospace structures for lightning strike protection in fixed and rotary wing aircraft. In August 2015 , the Company, through HEICO Electronic, acquired 80.1% of the equity of Midwest Microwave Solutions, Inc. (“MMS”). MMS designs, manufactures and sells unique Size, Weight, Power and Cost (SWAP-C) optimized Communications and Electronic Intercept Receivers and Tuners for military and intelligence applications. The remaining 19.9% continues to be owned by certain members of MMS’ management team (see Note 11, Redeemable Noncontrolling Interests, for additional information). In August 2015 , the Company, through HEICO Flight Support Corp., acquired 80.1% of the assets and assumed certain liabilities of Aerospace & Commercial Technologies, LLC (“ACT”). ACT is a provider of products and services necessary to maintain up-to-date F-16 fighter aircraft operational capabilities. The remaining 19.9% continues to be owned by certain members of ACT’s management team (see Note 11, Redeemable Noncontrolling Interests, for additional information). In May 2015 , the Company, through a subsidiary of HEICO Flight Support Corp., acquired all of the stock of Thermal Energy Products, Inc. (“TEP”). TEP engineers, designs and manufactures removable/reusable insulation systems for industrial, commercial, aerospace and defense applications. In January 2015 , the Company, through HEICO Flight Support Corp., acquired 80.1% of the equity of Harter Aerospace, LLC ("Harter"). Harter is a globally recognized component and accessory maintenance, repair, and overhaul (MRO) station specializing in commercial aircraft accessories, including thrust reverse actuation systems and pneumatics, and electromechanical components. The remaining 19.9% interest continues to be owned by certain members of Harter's management team (see Note 11, Redeemable Noncontrolling Interests, for additional information). In January 2015 , the Company, through HEICO Flight Support Corp., acquired 80% of the equity of Aeroworks International Holding B.V. (“Aeroworks”). Aeroworks, which is headquartered in the Netherlands and maintains a significant portion of its production facilities in Thailand and Laos, is a manufacturer of both composite and metal parts used primarily in aircraft interior applications, including seating, galleys, lavatories, doors, and overhead bins. The remaining 20% interest continues to be owned by a certain member of Aeroworks' management team (see Note 11, Redeemable Noncontrolling Interests, for additional information). The total consideration includes an accrual representing the estimated fair value of contingent consideration that the Company may be obligated to pay should Aeroworks meet certain earnings objectives during each of the first four years following the acquisition. See Note 7, Fair Value Measurements, for additional information regarding the Company’s contingent consideration obligation. 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, 2017 2016 2015 Cash paid $109,345 $11,000 $171,829 Less: cash acquired (7,712 ) — (5,062 ) Cash paid, net 101,633 11,000 166,767 Contingent consideration — 1,225 21,355 Additional purchase consideration — — (211 ) Total consideration $101,633 $12,225 $187,911 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, 2017 2016 2015 Assets acquired: Goodwill $48,960 $6,876 $88,602 Customer relationships 29,500 2,800 58,410 Trade names 16,750 300 14,094 Intellectual property 1,950 2,000 29,177 Licenses — — 1,300 Inventories 27,271 249 18,055 Accounts receivable 15,169 — 10,719 Property, plant and equipment 4,503 — 16,031 Other assets 976 — 2,547 Total assets acquired, excluding cash 145,079 12,225 238,935 Liabilities assumed: Accounts payable 7,696 — 4,845 Accrued expenses 6,016 — 2,570 Deferred income taxes 4,984 — 6,764 Other liabilities 1,411 — 621 Total liabilities assumed 20,107 — 14,800 Noncontrolling interests in consolidated subsidiaries 23,339 — 36,224 Net assets acquired, excluding cash $101,633 $12,225 $187,911 The following table summarizes the weighted average amortization period of the definite-lived intangible assets acquired in connection with the Company's other fiscal 2017, 2016 and 2015 acquisitions (in years): Year ended October 31, 2017 2016 2015 Customer relationships 12 11 10 Trade names — 15 — Intellectual property 13 15 12 Licenses — — 11 The allocation of the total consideration of the Company's other fiscal 2017 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 A2C, MMS, ACT, Harter and Aeroworks benefit both the Company and the noncontrolling interest holders. The fair value of the noncontrolling interests in A2C, MMS, ACT, Harter and Aeroworks 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 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 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. The operating results of the Company's other fiscal 2016 acquisition were included in the Company's results of operations from the effective acquisition date. The amount of net sales and earnings of the Company's other fiscal 2016 acquisition included in the Consolidated Statement of Operations is not material. Had the other fiscal 2016 acquisition occurred 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 and 2015 would not have been materially different than the reported amounts. The operating results of the Company’s fiscal 2015 acquisitions were included in the Company’s results of operations from each of the effective acquisition dates. The Company’s consolidated net sales and net income attributable to HEICO for fiscal 2015 includes approximately $62.9 million and $7.9 million , respectively, from the fiscal 2015 acquisitions. The following table presents unaudited pro forma financial information for fiscal 2015 as if the Company's fiscal 2015 acquisitions had occurred as of November 1, 2013 (in thousands, except per share data): Year ended October 31, 2015 Net sales $1,244,911 Net income from consolidated operations $163,012 Net income attributable to HEICO $140,771 Net income per share attributable to HEICO shareholders: Basic $1.69 Diluted $1.66 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 fiscal 2015 acquisitions had taken place as of November 1, 2013. 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 acquisitions and inventory purchase accounting adjustments charged to cost of sales as the inventory is sold.

SELECTED FINANCIAL STATEMENT IN

SELECTED FINANCIAL STATEMENT INFORMATION	12 Months Ended
	Oct. 31, 2017
Selected Financial Statement Information [Abstract]
Additional Financial Information Disclosure [Text Block]	SELECTED FINANCIAL STATEMENT INFORMATION Accounts Receivable As of October 31, (in thousands) 2017 2016 Accounts receivable $225,462 $205,386 Less: Allowance for doubtful accounts (3,006 ) (3,159 ) Accounts receivable, net $222,456 $202,227 Costs and Estimated Earnings on Uncompleted Percentage-of-Completion Contracts As of October 31, (in thousands) 2017 2016 Costs incurred on uncompleted contracts $29,491 $19,086 Estimated earnings 19,902 13,887 49,393 32,973 Less: Billings to date (41,262 ) (39,142 ) $8,131 ($6,169 ) Included in the accompanying Consolidated Balance Sheets under the following captions: Accounts receivable, net (costs and estimated earnings in excess of billings) $9,377 $4,839 Accrued expenses and other current liabilities (billings in excess of costs and estimated earnings) (1,246 ) (11,008 ) $8,131 ($6,169 ) Changes in estimates pertaining to percentage-of-completion contracts did not have a material effect on net income from consolidated operations in fiscal 2017, 2016 or 2015. Inventories As of October 31, (in thousands) 2017 2016 Finished products $173,559 $131,008 Work in process 39,986 36,076 Materials, parts, assemblies and supplies 128,031 117,153 Contracts in process 2,415 3,253 Less: Billings to date (363 ) (1,188 ) Inventories, net of valuation reserves $343,628 $286,302 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) 2017 2016 Land $5,435 $5,090 Buildings and improvements 91,916 79,205 Machinery, equipment and tooling 191,298 171,717 Construction in progress 5,553 10,453 294,202 266,465 Less: Accumulated depreciation and amortization (164,319 ) (144,854 ) Property, plant and equipment, net $129,883 $121,611 The amounts set forth above include tooling costs having a net book value of $7.6 million and $7.7 million as of October 31, 2017 and 2016, respectively. Amortization expense on capitalized tooling was $2.7 million , $2.9 million and $2.4 million in fiscal 2017, 2016 and 2015, respectively. The amounts set forth above also include $4.8 million of assets under capital leases as of both October 31, 2017 and October 31, 2016. Accumulated depreciation associated with assets under capital leases was $1.0 million and $.9 million as of October 31, 2017 and October 31, 2016, 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 $21.9 million , $20.4 million and $17.8 million in fiscal 2017, 2016 and 2015, respectively. Accrued Expenses and Other Current Liabilities As of October 31, (in thousands) 2017 2016 Accrued employee compensation and related payroll taxes $78,058 $67,660 Deferred revenue 29,247 32,135 Accrued customer rebates and credits 12,866 11,881 Contingent consideration and other accrued purchase consideration 7,588 6,918 Other 19,853 17,459 Accrued expenses and other current liabilities $147,612 $136,053 The increase in accrued employee compensation and related payroll taxes principally reflects a higher level of accrued performance-based compensation based on the improved consolidated operating results and the impact from our fiscal 2017 acquisitions. The total customer rebates and credits deducted within net sales in fiscal 2017, 2016 and 2015 was $11.0 million , $10.8 million and $4.7 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 2017, 2016 and 2015 totaled $4.6 million , $6.8 million and $5.7 million , respectively. The aggregate liabilities of the LCP were $116.0 million and $87.9 million as of October 31, 2017 and 2016, respectively, and are classified within other long-term liabilities in the Company’s Consolidated Balance Sheets. The assets of the LCP, totaling $117.2 million and $88.5 million as of October 31, 2017 and 2016, 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 $5.7 million and $4.7 million as of October 31, 2017 and 2016, 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, 2017 and 2016, 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, 2017 2016 2015 R&D expenses $46,473 $44,726 $38,747 Accumulated Other Comprehensive Loss Changes in the components of accumulated other comprehensive loss during fiscal 2017 and 2016 are as follows (in thousands): Foreign Currency Translation Pension Benefit Obligation Accumulated Other Comprehensive Loss Balances as of October 31, 2015 ($24,368 ) ($712 ) ($25,080 ) Unrealized gain (loss) 415 (661 ) (246 ) 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 )

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	12 Months Ended
	Oct. 31, 2017
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 2017 and 2016 by operating segment are as follows (in thousands): Segment Consolidated FSG ETG Totals Balances as of October 31, 2015 $337,507 $429,132 $766,639 Goodwill acquired — 100,301 100,301 Foreign currency translation adjustments (256 ) (425 ) (681 ) Adjustments to goodwill (570 ) 28 (542 ) 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 The goodwill acquired during fiscal 2017 and 2016 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 2015 acquisitions. The Company estimates that the majority of the goodwill acquired in fiscal 2017 and all of the goodwill acquired in fiscal 2016 is deductible for income tax purposes. Based on the annual test for goodwill impairment as of October 31, 2017, 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, 2017 As of October 31, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortizing Assets: Customer relationships $379,966 ($117,069 ) $262,897 $248,271 ($88,829 ) $159,442 Intellectual property 181,811 (44,861 ) 136,950 139,817 (33,291 ) 106,526 Licenses 6,559 (2,928 ) 3,631 6,559 (2,325 ) 4,234 Patents 870 (551 ) 319 779 (480 ) 299 Non-compete agreements 817 (817 ) — 811 (811 ) — Trade names 466 (118 ) 348 466 (77 ) 389 570,489 (166,344 ) 404,145 396,703 (125,813 ) 270,890 Non-Amortizing Assets: Trade names 133,936 — 133,936 95,973 — 95,973 $704,425 ($166,344 ) $538,081 $492,676 ($125,813 ) $366,863 The increase in the gross carrying amount of customer relationships, intellectual property and non-amortizing trade names as of October 31, 2017 compared to October 31, 2016 principally relates to such intangible assets recognized in connection with the fiscal 2017 acquisitions (see Note 2, Acquisitions). Amortization expense related to intangible assets was $39.5 million , $36.4 million and $27.0 million in fiscal 2017, 2016 and 2015, respectively. Amortization expense for each of the next five fiscal years and thereafter is estimated to be $48.3 million in fiscal 2018, $46.0 million in fiscal 2019, $43.2 million in fiscal 2020, $40.5 million in fiscal 2021, $35.1 million in fiscal 2022 and $191.0 million thereafter.

LONG-TERM DEBT

LONG-TERM DEBT	12 Months Ended
	Oct. 31, 2017
Debt Disclosure [Abstract]
Long-term Debt [Text Block]	LONG-TERM DEBT Long-term debt consists of the following (in thousands): As of October 31, 2017 2016 Borrowings under revolving credit facility $671,000 $455,083 Capital leases and note payable 2,979 3,142 673,979 458,225 Less: Current maturities of long-term debt (451 ) (411 ) $673,528 $457,814 As of October 31, 2017 and 2016, the weighted average interest rate on borrowings under the Company's revolving credit facility was 2.4% and 1.6% , respectively. The revolving credit facility contains both financial and non-financial covenants. As of October 31, 2017, the Company was in compliance with all such covenants. As of October 31, 2017, the Company's borrowings under its revolving credit facility were to mature in fiscal 2019. In November 2017, the Company entered into a new $1.3 billion Revolving Credit Agreement with a bank syndicate, which matures in November 2022 and replaced the prior revolving credit facility (see Revolving Credit Facility below). During fiscal 2015, the Company elected to borrow €32 million under its revolving credit facility to facilitate a fiscal 2015 acquisition. During fiscal 2017, the Company repaid the full amount of the Euro borrowing. 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 $670 million 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. Borrowings under the Company's revolving credit facility as of October 31, 2017 were made under the Company's $670 million Revolving Credit Agreement (“Prior Credit Facility”) with a bank syndicate, which was amended in November 2013 to become an $800 million facility and again in April 2017 to become a $1.0 billion facility. The Prior Credit Facility was available to finance acquisitions and for working capital and other general corporate purposes of the Company, including capital expenditures. Advances under the Prior Credit Facility accrued interest at the Company’s choice of the “Base Rate” or the London Interbank Offered Rate (“LIBOR”) plus the applicable margin (based on the Company’s ratio of total funded debt to earnings before interest, taxes, depreciation and amortization, noncontrolling interests and non-cash charges, or “leverage ratio”). The Base Rate was the highest of (i) the Prime Rate; (ii) the Federal Funds rate plus .50% per annum; and (iii) the Adjusted LIBO Rate determined on a daily basis for an Interest Period of one month plus 1.00% per annum, as such capitalized terms were defined in the Prior Credit Facility. The applicable margin for a LIBOR-based borrowing ranged from .75% to 2.25% . The applicable margin for a Base Rate borrowing ranged from 0% to 1.25% . A fee was charged on the amount of the unused commitment ranging from .125% to .35% (depending on the Company’s leverage ratio). The Prior Credit Facility also included a $50 million sublimit for borrowings made in foreign currencies, letters of credit and swingline borrowings. Outstanding principal, accrued and unpaid interest and other amounts payable under the Prior Credit Facility may have been accelerated upon an event of default, as such events were described in the Prior Credit Facility. The Prior Credit Facility was unsecured and contained covenants that restricted the amount of certain payments, including dividends, and required, among other things, the maintenance of a total leverage ratio, a senior leverage ratio and a fixed charge coverage ratio. In the event the Company’s leverage ratio exceeded a specified level, the Prior Credit Facility would have become secured by the capital stock owned in substantially all of the Company’s subsidiaries. Capital Lease Obligations A subsidiary of HEICO Electronic is a party to a capital lease for a manufacturing facility and related property in France. The lease contains a bargain purchase option and has a twelve-year term, which began in fiscal 2011. Additionally, the subsidiary is a party to certain capital leases, principally for office equipment, with lease terms of approximately five years. Furthermore, a subsidiary of HEICO Flight Support Corp. entered into a ten-year capital lease for a manufacturing facility during fiscal 2016. 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, 2018 575 2019 575 2020 525 2021 519 2022 509 Thereafter 622 Total minimum lease payments 3,325 Less: amount representing interest (461 ) Present value of minimum lease payments $2,864

INCOME TAXES

INCOME TAXES	12 Months Ended
	Oct. 31, 2017
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, 2017 2016 2015 Domestic $264,420 $227,927 $206,612 Foreign 33,540 29,123 18,352 Income before taxes and noncontrolling interests $297,960 $257,050 $224,964 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, 2017 2016 2015 Current: Federal $85,047 $75,261 $65,857 State 6,820 7,463 8,559 Foreign 9,529 7,370 4,064 101,396 90,094 78,480 Deferred: Federal (9,661 ) (5,979 ) (4,459 ) State (499 ) (2,587 ) (1,907 ) Foreign (936 ) (628 ) (714 ) (11,096 ) (9,194 ) (7,080 ) Total income tax expense $90,300 $80,900 $71,400 A reconciliation of the federal statutory income tax rate to the Company’s effective tax rate is as follows: Year ended October 31, 2017 2016 2015 Federal statutory income tax rate 35.0 % 35.0 % 35.0 % State taxes, net of federal income tax benefit 1.9 % 1.7 % 2.4 % Research and development tax credits (1.8 %) (2.7 %) (1.9 %) Tax-exempt (gains) losses on corporate-owned life insurance policies (1.8 %) (.1 %) .1 % Domestic production activities tax deduction (1.1 %) (1.3 %) (1.2 %) Tax benefit related to stock option exercises (ASU 2016-09 adoption) (1.0 %) — % — % Noncontrolling interests’ share of income (.7 %) (.7 %) (1.3 %) Foreign tax differential, where permanently reinvested outside of the U.S. (.4 %) (.8 %) (.8 %) Other, net .2 % .4 % (.6 %) Effective tax rate 30.3 % 31.5 % 31.7 % 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 LCP and a $3.1 million discrete income tax benefit related to stock option exercises resulting from the adoption of ASU 2016-09 in the first quarter of fiscal 2017 (see Note 1, Summary of Significant Accounting Policies - New Accounting Pronouncements). 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's effective tax rate in fiscal 2016 decreased to 31.5% from 31.7% in fiscal 2015. The decrease principally reflects the benefits recognized in fiscal 2016 of a larger income tax credit for qualified R&D activities resulting from the retroactive and permanent extension of the U.S. federal R&D tax credit in December 2015 and a lower effective state tax rate driven by certain apportionment updates recognized upon the amendment of certain prior year tax returns in fiscal 2016. These decreases were partially offset by the benefits recognized in fiscal 2015 from a prior year tax return amendment for additional foreign tax credits related to R&D activities at one of our foreign subsidiaries and higher net income attributable to noncontrolling interests in subsidiaries structured as partnerships. 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 2013. 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, 2017 2016 Deferred tax assets: Deferred compensation liability $47,093 $36,134 Inventories 31,797 27,969 Share-based compensation 12,984 11,338 Bonus accrual 4,956 4,744 Vacation accrual 2,112 2,127 Customer rebates accrual 1,864 1,917 Deferred revenue 730 1,365 R&D related carryforward 645 2,057 Other 8,585 8,489 Total deferred tax assets 110,766 96,140 Deferred tax liabilities: Goodwill and other intangible assets (160,158 ) (150,185 ) Property, plant and equipment (7,887 ) (8,291 ) Other (1,747 ) (2,156 ) Total deferred tax liabilities (169,792 ) (160,632 ) Net deferred tax liability ($59,026 ) ($64,492 ) The net deferred tax liability is classified in the Company’s Consolidated Balance Sheets as follows (in thousands) in accordance with ASU 2015-17, which the Company adopted in the fourth quarter of fiscal 2017 on a retrospective basis (see Note 1, Summary of Significant Accounting Policies - New Accounting Pronouncements): As of October 31, 2017 2016 Long-term liability ($59,026 ) ($64,899 ) Long-term asset — 407 Net deferred tax liability ($59,026 ) ($64,492 ) As of October 31, 2017 and 2016, the Company’s liability for gross unrecognized tax benefits related to uncertain tax positions was $2.0 million and $1.6 million , respectively, of which $1.3 million and $1.0 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 2017 and 2016 is as follows (in thousands): Year ended October 31, 2017 2016 Balances as of beginning of year $1,602 $787 Increases related to current year tax positions 596 524 Increases related to prior year tax positions — 521 Decreases related to prior year tax positions (24 ) (14 ) Lapses of statutes of limitations (134 ) (216 ) Balances as of end of year $2,040 $1,602

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
	Oct. 31, 2017
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, 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 As of October 31, 2016 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 $— $86,004 $— $86,004 Money market funds 2,515 — — 2,515 Equity securities 1,832 — — 1,832 Mutual funds 1,758 — — 1,758 Other 1,043 50 — 1,093 Total assets $7,148 $86,054 $— $93,202 Liabilities: Contingent consideration $— $— $18,881 $18,881 The Company maintains two non-qualified deferred compensation plans. The assets of the 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 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 certain assets of a company by the ETG in fiscal 2016, the Company may be obligated to pay contingent consideration of up to $2.0 million in aggregate during the five year period following the acquisition. During fiscal 2017, the Company paid $.3 million of contingent consideration based on the actual financial performance of the acquired entity during the first year following the acquisition. As of October 31, 2017, the estimated fair value of the remaining contingent consideration was $1.4 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, or €18.3 million in aggregate, should the acquired entity meet certain earnings objectives during each of the first three years following the first anniversary of the acquisition. During fiscal 2017, the Company paid €6.1 million , or $6.8 million , of contingent consideration based on the actual earnings of the acquired entity during the second year following the acquisition. As of October 31, 2017, the estimated fair value of the remaining contingent consideration was €10.8 million , or $12.6 million . 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, 2017, the estimated fair value of the contingent consideration was $13.6 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, 2017 are as follows: Fiscal 2017 Acquisition Fiscal 2016 Acquisition Fiscal 2015 Acquisition Compound annual revenue growth rate range (8%) - 4% 4 % - 12% 8 % - 13% Weighted average discount rate 4.7% 3.4% .8% Changes in the Company’s contingent consideration liability measured at fair value on a recurring basis using unobservable inputs (Level 3) during fiscal 2017 and 2016 are as follows (in thousands): Liabilities Balance as of October 31, 2015 $21,405 Increase in accrued contingent consideration 3,063 Contingent consideration related to acquisition 1,225 Payment of contingent consideration (6,960 ) Foreign currency transaction adjustments 148 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 Included in the accompanying Consolidated Balance Sheet under the following captions: Accrued expenses and other current liabilities $7,368 Other long-term liabilities 20,205 $27,573 The Company recorded the increase 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 2017 and 2016. The carrying amounts of the Company’s cash and cash equivalents, accounts receivable, trade accounts payable and accrued expenses and other current liabilities approximate fair value as of October 31, 2017 due to the relatively short maturity of the respective instruments. The carrying amount of long-term debt approximates fair value due to its variable interest rates.

SHAREHOLDERS' EQUITY

SHAREHOLDERS' EQUITY	12 Months Ended
	Oct. 31, 2017
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, 2017, the maximum number of shares that may yet be purchased under this program was 3,127,266 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 2017, 2016 and 2015, the Company did not repurchase any shares of Company common stock under this program. Stock Split In 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 split was effected as of April 19, 2017 in the form of a 25% stock dividend distributed to shareholders of record as of April 7, 2017. All applicable share and per share information has been adjusted retrospectively to give effect to the fiscal 2017 5-for-4 stock split.

SHARE-BASED COMPENSATION

SHARE-BASED COMPENSATION	12 Months Ended
	Oct. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	SHARE-BASED COMPENSATION The Company may grant various forms of share-based compensation awards including stock options, restricted stock, restricted stock awards and stock appreciation rights through the HEICO Corporation 2012 Incentive Compensation Plan (“2012 Plan”). The 2012 Plan became effective in fiscal 2012, the same time the Company's 2002 Stock Option Plan (“2002 Plan”) expired. Also, in fiscal 2012, the Company made a decision to no longer issue options under its Non-Qualified Stock Option Plan (“NQSOP”). Options outstanding under the 2002 Plan and NQSOP may be exercised pursuant to their terms. The total number of shares approved by the shareholders of the Company for the 2012 Plan is 3.3 million plus any options outstanding under the 2002 Plan and NQSOP as of the 2012 Plan's effective date that are subsequently forfeited or expire. A total of approximately 5.2 million shares of the Company's common stock are reserved for issuance to employees, directors, officers and consultants as of October 31, 2017, including 4.7 million shares currently under option and 0.5 million shares available for future grants. Stock options granted pursuant to the 2012 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 2012 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 2012 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, 2017. The 2012 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, 2014 2,021 4,080 $18.08 Granted (363 ) 363 $41.48 Exercised — (274 ) $13.48 Outstanding as of October 31, 2015 1,658 4,169 $20.42 Granted (375 ) 375 $36.84 Exercised — (364 ) $16.33 Cancelled 7 (7 ) $29.10 Outstanding as of October 31, 2016 1,290 4,173 $22.23 Granted (759 ) 759 $64.63 Exercised — (262 ) $23.85 Outstanding as of October 31, 2017 531 4,670 $29.04 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, 2017 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 2,343 $25.44 4.0 $152,858 Class A Common Stock 2,327 $32.66 6.1 101,081 4,670 $29.04 5.1 $253,939 Options Exercisable Number Outstanding Weighted Average Exercise Price Weighted Average Remaining Contractual Life (Years) Aggregate Intrinsic Value Common Stock 1,887 $17.82 2.9 $137,469 Class A Common Stock 1,226 $20.30 4.3 68,432 3,113 $18.80 3.5 $205,901 Information concerning stock options exercised is as follows (in thousands): Year ended October 31, 2017 2016 2015 Cash proceeds from stock option exercises $5,659 $5,924 $3,673 Tax benefit realized from stock option exercises 3,087 868 1,402 Intrinsic value of stock option exercises 10,376 9,751 6,958 Net income attributable to HEICO for the fiscal years ended October 31, 2017, 2016 and 2015 includes compensation expense of $7.4 million , $6.4 million and $5.8 million , respectively, and an income tax benefit of $2.6 million , $2.4 million and $2.2 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, 2017, there was $25.5 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 3.7 years. The total fair value of stock options that vested in fiscal 2017, 2016 and 2015 was $5.3 million , $5.8 million and $5.5 million , respectively. If there were a change in control of the Company, all of the unvested options outstanding as of October 31, 2017 would become immediately exercisable. As previously mentioned in Note 1, Summary of Significant Accounting Policies - New Accounting Pronouncements, the Company adopted ASU 2016-09 in fiscal 2017, resulting in the recognition of a $3.1 million discrete income tax benefit from stock option exercises in the Company's Consolidated Statement of Operations as a component of income tax expense. For the fiscal years ended October 31, 2016 and 2015, the excess tax benefit resulting from tax deductions in excess of the cumulative compensation cost recognized for stock options exercised was $.9 million and $1.4 million , respectively, and is presented as a financing activity in the Company’s Consolidated Statements of Cash Flows. The fair value of each stock option grant in fiscal 2017, 2016 and 2015 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, 2017 2016 2015 Common Stock Class A Common Stock Common Stock Class A Common Stock Common Stock Class A Common Stock Expected stock price volatility 37.89 % 28.18 % 39.63 % 32.52 % 39.96 % 36.51 % Risk-free interest rate 2.44 % 2.06 % 2.16 % 1.82 % 2.30 % 2.12 % Dividend yield .26 % .31 % .24 % .32 % .24 % .32 % Forfeiture rate .00 % .00 % .00 % .00 % .00 % .00 % Expected option life (years) 9 7 9 6 9 7 Weighted average fair value $33.38 $19.49 $18.90 $12.38 $22.77 $15.67

EMPLOYEE RETIREMENT PLANS

EMPLOYEE RETIREMENT PLANS	12 Months Ended
	Oct. 31, 2017
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 2017, 2016 and 2015 totaled $7.8 million , $7.0 million and $6.1 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, 2014 85 85 Issuance of common stock to 401(k) Plan (67 ) (67 ) Shares available for issuance as of October 31, 2015 18 18 Shares registered for issuance to the 401(k) Plan 375 375 Issuance of common stock to 401(k) Plan (78 ) (78 ) Shares available for issuance as of October 31, 2016 315 315 Issuance of common stock to 401(k) Plan (60 ) (60 ) Shares available for issuance as of October 31, 2017 255 255 As previously mentioned in Note 1, Summary of Significant Accounting Policies, the Company acquired a frozen qualified defined benefit pension plan in connection with a prior year acquisition. Changes in the Plan's projected benefit obligation and plan assets during fiscal 2017 and 2016 are as follows (in thousands): Change in projected benefit obligation: Projected benefit obligation as of October 31, 2015 $14,168 Actuarial loss 655 Interest cost 613 Benefits paid (925 ) 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 Change in plan assets: Fair value of plan assets as of October 31, 2015 $10,767 Actual return on plan assets 263 Employer contributions 405 Benefits paid (925 ) 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 Funded status as of October 31, 2016 ($4,001 ) Funded status as of October 31, 2017 ($2,930 ) The $2.9 million and $4.0 million difference between the projected benefit obligation and fair value of plan assets as of October 31, 2017 and October 31, 2016, respectively, is included in other long-term liabilities within the Company's Consolidated Balance Sheets. Additionally, the Plan experienced a $.5 million unrealized gain and a $1.1 million unrealized loss during fiscal 2017 and 2016, respectively, that were recognized in other comprehensive income (loss) and reported net of $.2 million and ($.4) million of tax in fiscal 2017 and 2016, 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, 2017 is $1.7 million (pre-tax), of which the Company expects to recognize less than $.1 million during fiscal 2018. Weighted average assumptions used to determine the projected benefit obligation are as follows: As of October 31, 2017 2016 Discount rate 3.98 % 3.99 % Weighted average assumptions used to determine net pension income are as follows: Year ended October 31, 2017 2016 2015 Discount rate 3.99 % 4.47 % 4.20 % 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, 2017 2016 2015 Expected return on plan assets $688 $702 $738 Less: Interest cost (561 ) (613 ) (561 ) Less: Amortization of unrealized loss (46 ) — — Net pension income $81 $89 $177 The Company anticipates making contributions of $.5 million to the Plan during fiscal 2018. 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, 2018 $895 2019 926 2020 928 2021 898 2022 878 2023-2027 4,378 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, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Equity securities $5,593 $— $— $5,593 Fixed income securities 5,382 — — 5,382 Money market funds and cash 95 — — 95 $11,070 $— $— $11,070 As of October 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Equity securities $5,149 $— $— $5,149 Fixed income securities 5,219 — — 5,219 Money market funds and cash 142 — — 142 $10,510 $— $— $10,510 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, 2017 2016 Actual Target Actual Target Equity securities 50 % 50 % 49 % 50 % Fixed income securities 49 % 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, 2017
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, 2017, management’s estimate of the aggregate Redemption Amount of all Put Rights that the Company could be required to pay is approximately $131.1 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, 2017 redeemable at fair value is approximately $82.1 million and the portion redeemable based solely on a multiple of future earnings is approximately $49.0 million . A summary of the Put Rights associated with the redeemable noncontrolling interests in certain of the Company’s subsidiaries as of October 31, 2017 is as follows: Subsidiary Operating Company Earliest Purchase 2005 ETG 95.9% 2018 (1) 4 (2) 2006 FSG 80.1% 2018 (1) 4 2008 FSG 82.3% 2018 (1) 5 2009 ETG 82.5% 2018 (1) 1 2012 ETG 78.0% 2018 (1) 2 2012 FSG 84.0% 2018 4 2012 FSG 80.1% 2019 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) (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 2018 is approximately $40.4 million , of which approximately $21.0 million would be payable in fiscal 2018 should all of the eligible associated noncontrolling interest holders elect to exercise their Put Rights during fiscal 2018. 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 Redemption Amount for the redeemable noncontrolling interests acquired in fiscal 2017 and 2016, respectively, were paid using cash provided by operating activities.

NET INCOME PER SHARE ATTRIBUTAB

NET INCOME PER SHARE ATTRIBUTABLE TO HEICO SHAREHOLDERS	12 Months Ended
	Oct. 31, 2017
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, 2017 2016 2015 Numerator: Net income attributable to HEICO $185,985 $156,192 $133,364 Denominator: Weighted average common shares outstanding - basic 84,290 83,807 83,425 Effect of dilutive stock options 2,486 1,406 1,339 Weighted average common shares outstanding - diluted 86,776 85,213 84,764 Net income per share attributable to HEICO shareholders: Basic $2.21 $1.86 $1.60 Diluted $2.14 $1.83 $1.57 Anti-dilutive stock options excluded 511 725 515

QUARTERLY FINANCIAL INFORMATION

QUARTERLY FINANCIAL INFORMATION (UNAUDITED)	12 Months Ended
	Oct. 31, 2017
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: 2017 $343,432 $368,657 $391,500 $421,224 2016 $306,227 $350,648 $356,084 $363,299 Gross profit: 2017 $125,417 $140,382 $148,897 $160,029 2016 $112,196 $134,029 $133,583 $135,684 Net income from consolidated operations: 2017 $46,265 $50,833 $51,475 $59,087 2016 $35,924 $43,729 $46,976 $49,521 Net income attributable to HEICO: 2017 $40,927 $45,686 $45,698 $53,674 2016 $31,271 $38,657 $42,002 $44,262 Net income per share attributable to HEICO: Basic: 2017 $.49 $.54 $.54 $.64 2016 $.37 $.46 $.50 $.53 Diluted: 2017 $.47 $.53 $.53 $.62 2016 $.37 $.45 $.49 $.52 During the first quarter of fiscal 2017, the Company adopted ASU 2016-09 (see Note 1, Summary of Significant Accounting Policies - New Accounting Pronouncements), resulting in the recognition of a $3.1 million discrete income tax benefit and a 679,000 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 $.03 per basic and diluted share. During the first quarter of fiscal 2016, the Company incurred $3.1 million of acquisition costs in connection with a fiscal 2016 acquisition. These expenses, net of tax, decreased net income attributable to HEICO by $2.0 million , or $.02 per basic and diluted share. During the first quarter of fiscal 2016, the Company recognized additional income tax credits for qualified R&D activities related to the last ten months of fiscal 2015 upon the retroactive and permanent extension of the U.S. federal R&D tax credit in December 2015, which, net of expenses, increased net income attributable to HEICO by $1.7 million , or $.02 per basic and per diluted share. Due to changes in the average number of common shares outstanding, net income per share attributable to HEICO for the full fiscal year may not equal the sum of the four individual quarters.

OPERATING SEGMENTS

OPERATING SEGMENTS	12 Months Ended
	Oct. 31, 2017
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, 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, 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 Year ended October 31, 2015: Net sales $809,700 $390,982 ($12,034 ) $1,188,648 Depreciation 10,859 6,803 168 17,830 Amortization 13,470 15,945 662 30,077 Operating income 149,798 98,833 (18,975 ) 229,656 Capital expenditures 11,737 6,201 311 18,249 Total assets 867,213 743,873 89,771 1,700,857 (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, 2017 2016 2015 Flight Support Group: Aftermarket replacement parts (1) $489,644 $405,108 $356,070 Repair and overhaul parts and services (2) 270,482 251,357 258,952 Specialty products (3) 207,414 219,405 194,678 Total net sales 967,540 875,870 809,700 Electronic Technologies Group: Electronic component parts for defense, space and aerospace equipment (4) 420,991 371,297 255,095 Electronic component parts for equipment in various other industries (5) 153,270 139,975 135,887 Total net sales 574,261 511,272 390,982 Other, primarily corporate and intersegment (16,988 ) (10,884 ) (12,034 ) Total consolidated net sales $1,524,813 $1,376,258 $1,188,648 (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, 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 110 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. 2017 2016 2015 Net Sales: United States of America $1,007,491 $904,670 $785,567 Other countries 517,322 471,588 403,081 Total net sales $1,524,813 $1,376,258 $1,188,648 Long-lived assets: United States of America $97,367 $94,889 $85,253 Other countries 32,516 26,722 20,417 Total long-lived assets $129,883 $121,611 $105,670

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Oct. 31, 2017
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, 2018 $13,402 2019 12,249 2020 11,748 2021 10,904 2022 9,759 Thereafter 16,065 Total minimum lease commitments $74,127 Total rent expense charged to operations for operating leases in fiscal 2017, 2016 and 2015 amounted to $15.6 million , $14.7 million and $11.9 million , respectively. Guarantees As of October 31, 2017, the Company has arranged for standby letters of credit aggregating $4.2 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 2017 and 2016 are as follows (in thousands): Year ended October 31, 2017 2016 Balances as of beginning of year $3,351 $3,203 Accruals for warranties 2,254 3,025 Warranty claims settled (2,684 ) (2,877 ) Balances as of end of year $2,921 $3,351 Litigation The Company is involved in various legal actions arising in the normal course of business. Based upon the Company’s and its legal counsel’s evaluations of any claims or assessments, management is of the opinion that the outcome of these matters will not have a material adverse effect on the Company’s results of operations, financial position or cash flows.

SUPPLEMENTAL DISCLOSURES OF CAS

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION	12 Months Ended
	Oct. 31, 2017
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 2017, 2016 and 2015 (in thousands): Year ended October 31, 2017 2016 2015 Cash paid for income taxes $95,851 $87,486 $76,021 Cash received from income tax refunds (2,953 ) (1,906 ) (1,211 ) Cash paid for interest 9,631 8,288 4,598 Contingent consideration 13,797 1,225 21,355 Additional purchase consideration 220 — (204 ) Property, plant and equipment acquired through capital lease obligations 37 1,111 59

SUBSEQUENT EVENT SUBSEQUENT EVE

SUBSEQUENT EVENT SUBSEQUENT EVENT (Notes)	12 Months Ended
	Oct. 31, 2017
Subsequent Events [Abstract]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS In November 2017 , the Company, through a subsidiary of HEICO Electronic, acquired all 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 and the total consideration for the acquisition is not material or significant to the Company’s consolidated financial statements. On December 15, 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 split is payable to shareholders of record as of January 3, 2018 and the Company expects to distribute the additional shares to shareholders on January 17, 2018. Accordingly, the prices of both the Company's Class A Common Stock and Common Stock are anticipated to begin trading on a post-split basis on January 18, 2018. None of the applicable share and per share information in these consolidated financial statements on Form 10-K has been adjusted retrospectively to give effect to the pending 5-for-4 stock split. Pro forma unaudited net income per share attributable to HEICO shareholders and the weighted average number of common shares outstanding for fiscal 2017, 2016 and 2015 giving retrospective effect to the pending fiscal 2018 stock split is as follows (in thousands, except per share data): Year ended October 31, 2017 2016 2015 Net income per share attributable to HEICO shareholders: Basic $1.77 $1.49 $1.28 Diluted $1.71 $1.47 $1.26 Weighted average number of common shares outstanding: Basic 105,363 104,758 104,281 Diluted 108,470 106,516 105,955

VALUATION AND QUALIFYING ACCOUN

VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Oct. 31, 2017
Valuation and Qualifying Accounts [Abstract]
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS Year ended October 31, 2017 2016 2015 Allowance for doubtful accounts (in thousands): Allowance as of beginning of year $3,159 $2,038 $2,143 Additions charged to costs and expenses 7 390 248 Additions charged to other accounts (a) 298 973 55 Deductions (b) (458 ) (242 ) (408 ) Allowance as of end of year $3,006 $3,159 $2,038 (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, 2017 2016 2015 Inventory valuation reserves (in thousands): Reserves as of beginning of year $81,449 $69,654 $60,608 Additions charged to costs and expenses 6,284 10,270 7,779 Additions charged to other accounts (a) 6,264 6,268 4,598 Deductions (b) (1,849 ) (4,743 ) (3,331 ) Reserves as of end of year $92,148 $81,449 $69,654 (a) Principally additions from acquisitions and foreign currency translation adjustments. (b) Principally write-offs of slow-moving, obsolete or damaged inventory.

SUMMARY OF SIGNIFICANT ACCOUN27

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Oct. 31, 2017
Summary Of Significant Accounting Policies (Policies) [Abstract]
Nature Of Business, Policy [Policy Text Block]	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, 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, and a wholly owned subsidiary of HEICO Electronic consolidates a subsidiary which is 78% owned. See Note 11, Redeemable Noncontrolling Interests. All intercompany balances and transactions are eliminated.
Stock Split [Policy Text Block]	Stock Split In 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 split was effected as of April 19, 2017 in the form of a 25% stock dividend distributed to shareholders of record as of April 7, 2017. All applicable share and per share information has been adjusted retrospectively to give effect to the fiscal 2017 5-for-4 stock split.
Use of Estimates and Assumptions, Policy [Policy Text Block]	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, 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 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, 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 market, 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 [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 depreciated over the following estimated useful lives: Buildings and improvements 10 to 40 years Leasehold improvements 2 to 20 years Machinery and equipment 3 to 10 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 2017 or 2015 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, 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 6 to 15 years Intellectual property 7 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 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, Policy [Policy Text Block]	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, Policy [Policy Text Block]	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, 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 comprehensive income or (loss), net of tax. See Note 10, Employee Retirement Plans, for additional information and disclosures about the Plan.
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 3% , 3% and 4% in fiscal 2017, 2016 and 2015, 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 2017, 2016 or 2015. 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.
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 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, 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 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, Policy [Policy Text Block]	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 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 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, Policy [Policy Text Block]	New Accounting Pronouncements In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, “Revenue from Contracts with Customers,” 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. Early adoption in the year preceding the effective date is permitted. ASU 2014-09 shall be applied either retrospectively to each prior reporting period presented or retrospectively with the cumulative effect of initially applying ASU 2014-09 recognized at the date of initial application. The Company is currently evaluating which transition method it will elect. In addition, the Company is currently identifying its various revenue streams and reviewing certain underlying customer contracts to determine the effect the adoption of this guidance will have on its consolidated results of operations, financial position and cash flows. 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. Under current guidance, inventories are measured at the lower of cost or market. ASU 2015-11 must be applied prospectively and is effective for fiscal years and interim reporting periods within those years beginning after December 15, 2016, or in fiscal 2018 for HEICO. The Company is currently evaluating the effect, if any, the adoption of this guidance will have on its consolidated results of operations, financial position and cash flows. In November 2015, the FASB issued ASU 2015-17, "Balance Sheet Classification of Deferred Taxes," which requires that all deferred tax assets and liabilities be classified as noncurrent in the balance sheet. The Company adopted ASU 2015-17 on a retrospective basis in the fourth quarter of fiscal 2017, resulting in a reclassification of $41.1 million in current deferred tax assets to noncurrent deferred tax liabilities in the Company's Consolidated Balance Sheet as of October 31, 2016. 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 requires a modified retrospective transition approach and provides certain optional transition relief. 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 March 2016, the FASB issued ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting," which simplifies several aspects related to accounting for share-based payment transactions. Under ASU 2016-09, all excess tax benefits and tax deficiencies are to be recognized in the statement of operations as a component of income tax expense rather than as capital in excess of par value. The Company adopted ASU 2016-09 in the first quarter of fiscal 2017 resulting in the recognition of a $3.1 million discrete income tax benefit, which, net of noncontrolling interests, increased net income attributable to HEICO by $2.6 million . Additionally, ASU 2016-09 requires excess tax benefits and deficiencies to be prospectively excluded from the assumed future proceeds in the calculation of diluted shares, which increased the Company's weighted average number of diluted common shares outstanding by 781,000 for fiscal 2017. Further, ASU 2016-09 requires excess tax benefits be presented within the statement of cash flows as an operating activity rather than as a financing activity. The Company adopted this change on a prospective basis, which resulted in a $3.1 million increase in cash provided by operating activities and a $3.1 million decrease in cash provided by financing activities in fiscal 2017. 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. ASU 2016-15 provides guidance on eight specific cash flow classification issues including contingent consideration payments made after a business combination, proceeds from corporate-owned life insurance policies and distributions received from equity method investees. ASU 2016-15 is effective for fiscal years and interim reporting periods within those years beginning after December 15, 2017, or in fiscal 2019 for HEICO. Early adoption is permitted. ASU 2016-15 requires a retrospective transition approach for all periods presented. The Company is currently evaluating the effect the adoption of this guidance will have on its consolidated statement of cash flows. In January 2017, the FASB issued ASU 2017-04, "Simplifying the Test for Goodwill Impairment," which is intended to simplify the current test for goodwill impairment by eliminating the second step in which the implied value of a reporting unit is calculated when the carrying value of the reporting unit exceeds its fair value. Under ASU 2017-04, goodwill impairment should be recognized for the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. ASU 2017-04 must be applied prospectively and is effective for any annual or interim goodwill impairment test in fiscal years beginning after December 15, 2019, or in fiscal 2021 for HEICO. Early adoption is permitted. The Company does not expect the adoption of this guidance to have a material impact on its consolidated results of operations, financial position and cash flows.
Assets Held under Capital Leases [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Policy [Policy Text Block]	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.

SUMMARY OF SIGNIFICANT ACCOUN28

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Oct. 31, 2017
Summary Of Significant Accounting Policies (Details) [Abstract]
Property, Plant and Equipment [Table Text Block]	The Company’s property, plant and equipment is depreciated over the following estimated useful lives: Buildings and improvements 10 to 40 years Leasehold improvements 2 to 20 years Machinery and equipment 3 to 10 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 6 to 15 years Intellectual property 7 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, 2017
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 2017, 2016 and 2015 acquisitions (in years): Year ended October 31, 2017 2016 2015 Customer relationships 12 11 10 Trade names — 15 — Intellectual property 13 15 12 Licenses — — 11
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, 2017 2016 2015 Cash paid $109,345 $11,000 $171,829 Less: cash acquired (7,712 ) — (5,062 ) Cash paid, net 101,633 11,000 166,767 Contingent consideration — 1,225 21,355 Additional purchase consideration — — (211 ) Total consideration $101,633 $12,225 $187,911
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, 2017 2016 2015 Assets acquired: Goodwill $48,960 $6,876 $88,602 Customer relationships 29,500 2,800 58,410 Trade names 16,750 300 14,094 Intellectual property 1,950 2,000 29,177 Licenses — — 1,300 Inventories 27,271 249 18,055 Accounts receivable 15,169 — 10,719 Property, plant and equipment 4,503 — 16,031 Other assets 976 — 2,547 Total assets acquired, excluding cash 145,079 12,225 238,935 Liabilities assumed: Accounts payable 7,696 — 4,845 Accrued expenses 6,016 — 2,570 Deferred income taxes 4,984 — 6,764 Other liabilities 1,411 — 621 Total liabilities assumed 20,107 — 14,800 Noncontrolling interests in consolidated subsidiaries 23,339 — 36,224 Net assets acquired, excluding cash $101,633 $12,225 $187,911
FY 2015 Acquisition [Member]
Business Acquisition [Line Items]
Schedule of Pro Forma Information [Table Text Block]	The following table presents unaudited pro forma financial information for fiscal 2015 as if the Company's fiscal 2015 acquisitions had occurred as of November 1, 2013 (in thousands, except per share data): Year ended October 31, 2015 Net sales $1,244,911 Net income from consolidated operations $163,012 Net income attributable to HEICO $140,771 Net income per share attributable to HEICO shareholders: Basic $1.69 Diluted $1.66
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 220 Total consideration $330,649
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 $160,903 Customer relationships 100,000 Intellectual property 39,000 Trade name 20,000 Accounts receivable 6,115 Inventories 5,923 Property, plant and equipment 1,246 Other assets 208 Total assets acquired, excluding cash 333,395 Liabilities assumed: Accounts payable 1,290 Accrued expenses 1,456 Total liabilities assumed 2,746 Net assets acquired, excluding cash $330,649
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 Year ended October 31, 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 $2.36 $1.97 Diluted $2.29 $1.94
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
Schedule of Pro Forma Information [Table Text Block]	The following table presents unaudited pro forma financial information for fiscal 2015 as if the acquisition of Robertson had occurred as of November 1, 2014 (in thousands, except per share data): Year ended October 31, 2015 Net sales $1,275,926 Net income from consolidated operations $162,645 Net income attributable to HEICO $142,445 Net income per share attributable to HEICO shareholders: Basic $1.71 Diluted $1.68

SELECTED FINANCIAL STATEMENT 30

SELECTED FINANCIAL STATEMENT INFORMATION (Tables)	12 Months Ended
	Oct. 31, 2017
Selected Financial Statement Information [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	Accounts Receivable As of October 31, (in thousands) 2017 2016 Accounts receivable $225,462 $205,386 Less: Allowance for doubtful accounts (3,006 ) (3,159 ) Accounts receivable, net $222,456 $202,227
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) 2017 2016 Costs incurred on uncompleted contracts $29,491 $19,086 Estimated earnings 19,902 13,887 49,393 32,973 Less: Billings to date (41,262 ) (39,142 ) $8,131 ($6,169 ) Included in the accompanying Consolidated Balance Sheets under the following captions: Accounts receivable, net (costs and estimated earnings in excess of billings) $9,377 $4,839 Accrued expenses and other current liabilities (billings in excess of costs and estimated earnings) (1,246 ) (11,008 ) $8,131 ($6,169 )
Schedule of Inventory, Current [Table Text Block]	Inventories As of October 31, (in thousands) 2017 2016 Finished products $173,559 $131,008 Work in process 39,986 36,076 Materials, parts, assemblies and supplies 128,031 117,153 Contracts in process 2,415 3,253 Less: Billings to date (363 ) (1,188 ) Inventories, net of valuation reserves $343,628 $286,302
Property, Plant and Equipment [Table Text Block]	Property, Plant and Equipment As of October 31, (in thousands) 2017 2016 Land $5,435 $5,090 Buildings and improvements 91,916 79,205 Machinery, equipment and tooling 191,298 171,717 Construction in progress 5,553 10,453 294,202 266,465 Less: Accumulated depreciation and amortization (164,319 ) (144,854 ) Property, plant and equipment, net $129,883 $121,611
Schedule Of Accrued Expenses and Other Current Liabilities [Table Text Block]	Accrued Expenses and Other Current Liabilities As of October 31, (in thousands) 2017 2016 Accrued employee compensation and related payroll taxes $78,058 $67,660 Deferred revenue 29,247 32,135 Accrued customer rebates and credits 12,866 11,881 Contingent consideration and other accrued purchase consideration 7,588 6,918 Other 19,853 17,459 Accrued expenses and other current liabilities $147,612 $136,053
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, 2017 2016 2015 R&D expenses $46,473 $44,726 $38,747
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Changes in the components of accumulated other comprehensive loss during fiscal 2017 and 2016 are as follows (in thousands): Foreign Currency Translation Pension Benefit Obligation Accumulated Other Comprehensive Loss Balances as of October 31, 2015 ($24,368 ) ($712 ) ($25,080 ) Unrealized gain (loss) 415 (661 ) (246 ) 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 )

GOODWILL AND OTHER INTANGIBLE31

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	12 Months Ended
	Oct. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	Changes in the carrying amount of goodwill during fiscal 2017 and 2016 by operating segment are as follows (in thousands): Segment Consolidated FSG ETG Totals Balances as of October 31, 2015 $337,507 $429,132 $766,639 Goodwill acquired — 100,301 100,301 Foreign currency translation adjustments (256 ) (425 ) (681 ) Adjustments to goodwill (570 ) 28 (542 ) 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
Schedule Of Identifiable Intangible Assets [Table Text Block]	Identifiable intangible assets consist of the following (in thousands): As of October 31, 2017 As of October 31, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortizing Assets: Customer relationships $379,966 ($117,069 ) $262,897 $248,271 ($88,829 ) $159,442 Intellectual property 181,811 (44,861 ) 136,950 139,817 (33,291 ) 106,526 Licenses 6,559 (2,928 ) 3,631 6,559 (2,325 ) 4,234 Patents 870 (551 ) 319 779 (480 ) 299 Non-compete agreements 817 (817 ) — 811 (811 ) — Trade names 466 (118 ) 348 466 (77 ) 389 570,489 (166,344 ) 404,145 396,703 (125,813 ) 270,890 Non-Amortizing Assets: Trade names 133,936 — 133,936 95,973 — 95,973 $704,425 ($166,344 ) $538,081 $492,676 ($125,813 ) $366,863

LONG-TERM DEBT (Tables)

LONG-TERM DEBT (Tables)	12 Months Ended
	Oct. 31, 2017
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, 2017 2016 Borrowings under revolving credit facility $671,000 $455,083 Capital leases and note payable 2,979 3,142 673,979 458,225 Less: Current maturities of long-term debt (451 ) (411 ) $673,528 $457,814
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, 2018 575 2019 575 2020 525 2021 519 2022 509 Thereafter 622 Total minimum lease payments 3,325 Less: amount representing interest (461 ) Present value of minimum lease payments $2,864

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Oct. 31, 2017
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, 2017 2016 2015 Domestic $264,420 $227,927 $206,612 Foreign 33,540 29,123 18,352 Income before taxes and noncontrolling interests $297,960 $257,050 $224,964
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, 2017 2016 2015 Current: Federal $85,047 $75,261 $65,857 State 6,820 7,463 8,559 Foreign 9,529 7,370 4,064 101,396 90,094 78,480 Deferred: Federal (9,661 ) (5,979 ) (4,459 ) State (499 ) (2,587 ) (1,907 ) Foreign (936 ) (628 ) (714 ) (11,096 ) (9,194 ) (7,080 ) Total income tax expense $90,300 $80,900 $71,400
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, 2017 2016 2015 Federal statutory income tax rate 35.0 % 35.0 % 35.0 % State taxes, net of federal income tax benefit 1.9 % 1.7 % 2.4 % Research and development tax credits (1.8 %) (2.7 %) (1.9 %) Tax-exempt (gains) losses on corporate-owned life insurance policies (1.8 %) (.1 %) .1 % Domestic production activities tax deduction (1.1 %) (1.3 %) (1.2 %) Tax benefit related to stock option exercises (ASU 2016-09 adoption) (1.0 %) — % — % Noncontrolling interests’ share of income (.7 %) (.7 %) (1.3 %) Foreign tax differential, where permanently reinvested outside of the U.S. (.4 %) (.8 %) (.8 %) Other, net .2 % .4 % (.6 %) Effective tax rate 30.3 % 31.5 % 31.7 %
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, 2017 2016 Deferred tax assets: Deferred compensation liability $47,093 $36,134 Inventories 31,797 27,969 Share-based compensation 12,984 11,338 Bonus accrual 4,956 4,744 Vacation accrual 2,112 2,127 Customer rebates accrual 1,864 1,917 Deferred revenue 730 1,365 R&D related carryforward 645 2,057 Other 8,585 8,489 Total deferred tax assets 110,766 96,140 Deferred tax liabilities: Goodwill and other intangible assets (160,158 ) (150,185 ) Property, plant and equipment (7,887 ) (8,291 ) Other (1,747 ) (2,156 ) Total deferred tax liabilities (169,792 ) (160,632 ) Net deferred tax liability ($59,026 ) ($64,492 ) The net deferred tax liability is classified in the Company’s Consolidated Balance Sheets as follows (in thousands) in accordance with ASU 2015-17, which the Company adopted in the fourth quarter of fiscal 2017 on a retrospective basis (see Note 1, Summary of Significant Accounting Policies - New Accounting Pronouncements): As of October 31, 2017 2016 Long-term liability ($59,026 ) ($64,899 ) Long-term asset — 407 Net deferred tax liability ($59,026 ) ($64,492 )
Summary of Income Tax Contingencies [Table Text Block]	A reconciliation of the activity related to the liability for gross unrecognized tax benefits during fiscal 2017 and 2016 is as follows (in thousands): Year ended October 31, 2017 2016 Balances as of beginning of year $1,602 $787 Increases related to current year tax positions 596 524 Increases related to prior year tax positions — 521 Decreases related to prior year tax positions (24 ) (14 ) Lapses of statutes of limitations (134 ) (216 ) Balances as of end of year $2,040 $1,602

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Oct. 31, 2017
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, 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 As of October 31, 2016 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 $— $86,004 $— $86,004 Money market funds 2,515 — — 2,515 Equity securities 1,832 — — 1,832 Mutual funds 1,758 — — 1,758 Other 1,043 50 — 1,093 Total assets $7,148 $86,054 $— $93,202 Liabilities: Contingent consideration $— $— $18,881 $18,881
Fair Value Measurements, Recurring and Nonrecurring, 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, 2017 are as follows: Fiscal 2017 Acquisition Fiscal 2016 Acquisition Fiscal 2015 Acquisition Compound annual revenue growth rate range (8%) - 4% 4 % - 12% 8 % - 13% Weighted average discount rate 4.7% 3.4% .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 2017 and 2016 are as follows (in thousands): Liabilities Balance as of October 31, 2015 $21,405 Increase in accrued contingent consideration 3,063 Contingent consideration related to acquisition 1,225 Payment of contingent consideration (6,960 ) Foreign currency transaction adjustments 148 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 Included in the accompanying Consolidated Balance Sheet under the following captions: Accrued expenses and other current liabilities $7,368 Other long-term liabilities 20,205 $27,573

SHARE-BASED COMPENSATION (Table

SHARE-BASED COMPENSATION (Tables)	12 Months Ended
	Oct. 31, 2017
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, 2014 2,021 4,080 $18.08 Granted (363 ) 363 $41.48 Exercised — (274 ) $13.48 Outstanding as of October 31, 2015 1,658 4,169 $20.42 Granted (375 ) 375 $36.84 Exercised — (364 ) $16.33 Cancelled 7 (7 ) $29.10 Outstanding as of October 31, 2016 1,290 4,173 $22.23 Granted (759 ) 759 $64.63 Exercised — (262 ) $23.85 Outstanding as of October 31, 2017 531 4,670 $29.04
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, 2017 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 2,343 $25.44 4.0 $152,858 Class A Common Stock 2,327 $32.66 6.1 101,081 4,670 $29.04 5.1 $253,939 Options Exercisable Number Outstanding Weighted Average Exercise Price Weighted Average Remaining Contractual Life (Years) Aggregate Intrinsic Value Common Stock 1,887 $17.82 2.9 $137,469 Class A Common Stock 1,226 $20.30 4.3 68,432 3,113 $18.80 3.5 $205,901
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, 2017 2016 2015 Cash proceeds from stock option exercises $5,659 $5,924 $3,673 Tax benefit realized from stock option exercises 3,087 868 1,402 Intrinsic value of stock option exercises 10,376 9,751 6,958
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	The fair value of each stock option grant in fiscal 2017, 2016 and 2015 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, 2017 2016 2015 Common Stock Class A Common Stock Common Stock Class A Common Stock Common Stock Class A Common Stock Expected stock price volatility 37.89 % 28.18 % 39.63 % 32.52 % 39.96 % 36.51 % Risk-free interest rate 2.44 % 2.06 % 2.16 % 1.82 % 2.30 % 2.12 % Dividend yield .26 % .31 % .24 % .32 % .24 % .32 % Forfeiture rate .00 % .00 % .00 % .00 % .00 % .00 % Expected option life (years) 9 7 9 6 9 7 Weighted average fair value $33.38 $19.49 $18.90 $12.38 $22.77 $15.67

EMPLOYEE RETIREMENT PLANS EMPLO

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS (Tables)	12 Months Ended
	Oct. 31, 2017
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, 2014 85 85 Issuance of common stock to 401(k) Plan (67 ) (67 ) Shares available for issuance as of October 31, 2015 18 18 Shares registered for issuance to the 401(k) Plan 375 375 Issuance of common stock to 401(k) Plan (78 ) (78 ) Shares available for issuance as of October 31, 2016 315 315 Issuance of common stock to 401(k) Plan (60 ) (60 ) Shares available for issuance as of October 31, 2017 255 255
Schedule of Changes in Projected Benefit Obligations [Table Text Block]	Changes in the Plan's projected benefit obligation and plan assets during fiscal 2017 and 2016 are as follows (in thousands): Change in projected benefit obligation: Projected benefit obligation as of October 31, 2015 $14,168 Actuarial loss 655 Interest cost 613 Benefits paid (925 ) 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 Change in plan assets: Fair value of plan assets as of October 31, 2015 $10,767 Actual return on plan assets 263 Employer contributions 405 Benefits paid (925 ) 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 Funded status as of October 31, 2016 ($4,001 ) Funded status as of October 31, 2017 ($2,930 )
Schedule of Assumptions Used [Table Text Block]	Weighted average assumptions used to determine the projected benefit obligation are as follows: As of October 31, 2017 2016 Discount rate 3.98 % 3.99 % Weighted average assumptions used to determine net pension income are as follows: Year ended October 31, 2017 2016 2015 Discount rate 3.99 % 4.47 % 4.20 % 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, 2017 2016 2015 Expected return on plan assets $688 $702 $738 Less: Interest cost (561 ) (613 ) (561 ) Less: Amortization of unrealized loss (46 ) — — Net pension income $81 $89 $177
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, 2018 $895 2019 926 2020 928 2021 898 2022 878 2023-2027 4,378
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, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Equity securities $5,593 $— $— $5,593 Fixed income securities 5,382 — — 5,382 Money market funds and cash 95 — — 95 $11,070 $— $— $11,070 As of October 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Equity securities $5,149 $— $— $5,149 Fixed income securities 5,219 — — 5,219 Money market funds and cash 142 — — 142 $10,510 $— $— $10,510 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, 2017 2016 Actual Target Actual Target Equity securities 50 % 50 % 49 % 50 % Fixed income securities 49 % 50 % 50 % 50 % Money market funds and cash 1 % — % 1 % — % 100 % 100 % 100 % 100 %

REDEEMABLE NONCONTROLLING INT37

REDEEMABLE NONCONTROLLING INTERESTS REDEEMABLE NONCONTROLLING INTERESTS (Tables)	12 Months Ended
	Oct. 31, 2017
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, 2017 is as follows: Subsidiary Operating Company Earliest Purchase 2005 ETG 95.9% 2018 (1) 4 (2) 2006 FSG 80.1% 2018 (1) 4 2008 FSG 82.3% 2018 (1) 5 2009 ETG 82.5% 2018 (1) 1 2012 ETG 78.0% 2018 (1) 2 2012 FSG 84.0% 2018 4 2012 FSG 80.1% 2019 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) (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 ATTRIBUT38

NET INCOME PER SHARE ATTRIBUTABLE TO HEICO SHAREHOLDERS (Tables)	12 Months Ended
	Oct. 31, 2017
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, 2017 2016 2015 Numerator: Net income attributable to HEICO $185,985 $156,192 $133,364 Denominator: Weighted average common shares outstanding - basic 84,290 83,807 83,425 Effect of dilutive stock options 2,486 1,406 1,339 Weighted average common shares outstanding - diluted 86,776 85,213 84,764 Net income per share attributable to HEICO shareholders: Basic $2.21 $1.86 $1.60 Diluted $2.14 $1.83 $1.57 Anti-dilutive stock options excluded 511 725 515

QUARTERLY FINANCIAL INFORMATI39

QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Tables)	12 Months Ended
	Oct. 31, 2017
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: 2017 $343,432 $368,657 $391,500 $421,224 2016 $306,227 $350,648 $356,084 $363,299 Gross profit: 2017 $125,417 $140,382 $148,897 $160,029 2016 $112,196 $134,029 $133,583 $135,684 Net income from consolidated operations: 2017 $46,265 $50,833 $51,475 $59,087 2016 $35,924 $43,729 $46,976 $49,521 Net income attributable to HEICO: 2017 $40,927 $45,686 $45,698 $53,674 2016 $31,271 $38,657 $42,002 $44,262 Net income per share attributable to HEICO: Basic: 2017 $.49 $.54 $.54 $.64 2016 $.37 $.46 $.50 $.53 Diluted: 2017 $.47 $.53 $.53 $.62 2016 $.37 $.45 $.49 $.52

OPERATING SEGMENTS (Tables)

OPERATING SEGMENTS (Tables)	12 Months Ended
	Oct. 31, 2017
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, 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 Year ended October 31, 2015: Net sales $809,700 $390,982 ($12,034 ) $1,188,648 Depreciation 10,859 6,803 168 17,830 Amortization 13,470 15,945 662 30,077 Operating income 149,798 98,833 (18,975 ) 229,656 Capital expenditures 11,737 6,201 311 18,249 Total assets 867,213 743,873 89,771 1,700,857 (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, 2017 2016 2015 Flight Support Group: Aftermarket replacement parts (1) $489,644 $405,108 $356,070 Repair and overhaul parts and services (2) 270,482 251,357 258,952 Specialty products (3) 207,414 219,405 194,678 Total net sales 967,540 875,870 809,700 Electronic Technologies Group: Electronic component parts for defense, space and aerospace equipment (4) 420,991 371,297 255,095 Electronic component parts for equipment in various other industries (5) 153,270 139,975 135,887 Total net sales 574,261 511,272 390,982 Other, primarily corporate and intersegment (16,988 ) (10,884 ) (12,034 ) Total consolidated net sales $1,524,813 $1,376,258 $1,188,648 (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, 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.
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. 2017 2016 2015 Net Sales: United States of America $1,007,491 $904,670 $785,567 Other countries 517,322 471,588 403,081 Total net sales $1,524,813 $1,376,258 $1,188,648 Long-lived assets: United States of America $97,367 $94,889 $85,253 Other countries 32,516 26,722 20,417 Total long-lived assets $129,883 $121,611 $105,670

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Oct. 31, 2017
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, 2018 $13,402 2019 12,249 2020 11,748 2021 10,904 2022 9,759 Thereafter 16,065 Total minimum lease commitments $74,127
Schedule of Product Warranty Liability [Table Text Block]	Changes in the Company’s product warranty liability in fiscal 2017 and 2016 are as follows (in thousands): Year ended October 31, 2017 2016 Balances as of beginning of year $3,351 $3,203 Accruals for warranties 2,254 3,025 Warranty claims settled (2,684 ) (2,877 ) Balances as of end of year $2,921 $3,351

SUPPLEMENTAL DISCLOSURES OF C42

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION (Tables)	12 Months Ended
	Oct. 31, 2017
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 2017, 2016 and 2015 (in thousands): Year ended October 31, 2017 2016 2015 Cash paid for income taxes $95,851 $87,486 $76,021 Cash received from income tax refunds (2,953 ) (1,906 ) (1,211 ) Cash paid for interest 9,631 8,288 4,598 Contingent consideration 13,797 1,225 21,355 Additional purchase consideration 220 — (204 ) Property, plant and equipment acquired through capital lease obligations 37 1,111 59

SUBSEQUENT EVENT SUBSEQUENT E43

SUBSEQUENT EVENT SUBSEQUENT EVENT (Tables)	12 Months Ended
	Oct. 31, 2017
Subsequent Events [Abstract]
Schedule of Subsequent Events [Table Text Block]	Pro forma unaudited net income per share attributable to HEICO shareholders and the weighted average number of common shares outstanding for fiscal 2017, 2016 and 2015 giving retrospective effect to the pending fiscal 2018 stock split is as follows (in thousands, except per share data): Year ended October 31, 2017 2016 2015 Net income per share attributable to HEICO shareholders: Basic $1.77 $1.49 $1.28 Diluted $1.71 $1.47 $1.26 Weighted average number of common shares outstanding: Basic 105,363 104,758 104,281 Diluted 108,470 106,516 105,955

SUMMARY OF SIGNIFICANT ACCOUN44

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Oct. 31, 2017
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
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
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
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 ACCOUN45

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2)	12 Months Ended
	Oct. 31, 2017
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 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	7 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 ACCOUN46

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textuals) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
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					$ 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									3.00%	3.00%	4.00%
Stockholders' Equity Note, Stock Split, Conversion Ratio									0.25
Net income attributable to HEICO	$ 53,674	$ 45,698	$ 45,686	$ 40,927	44,262	$ 42,002	$ 38,657	$ 31,271	$ 185,985	$ 156,192	$ 133,364
Weighted Average Number of Shares Outstanding, Diluted									86,776,000	85,213,000	84,764,000
Lufthansa Technik AG [Member] | Heico Aerospace [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percentage of interest owned by noncontrolling shareholders	20.00%								20.00%
Heico Flight Support Corp [Member] | Subsidiaries [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	80.10%								80.10%
Heico Flight Support Corp [Member] | Subsidiary One [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	80.00%								80.00%
Heico Flight Support Corp [Member] | Subsidiary Two [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	84.00%								84.00%
HEICO Electronic [Member] | Subsidiary One [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	80.10%								80.10%
HEICO Electronic [Member] | Subsidiary Two [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	80.10%								80.10%
HEICO Electronic [Member] | Subsidiary Three [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	82.50%								82.50%
HEICO Electronic [Member] | Subsidiary Four [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	95.90%								95.90%
HEICO Electronic [Member] | Subsidiary Five [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	78.00%								78.00%
Heico Aerospace [Member] | Subsidiary One [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	80.10%								80.10%
Heico Aerospace [Member] | Subsidiary Two [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	82.30%								82.30%
Heico Aerospace [Member] | Joint Venture [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	84.00%								84.00%
Accounting Standards Update 2015-17 [Member]
Revenue Recognition [Abstract]
Deferred Tax Assets, Net of Valuation Allowance, Current					$ 41,100					$ 41,100
Accounting Standards Update 2016-09 [Member]
Revenue Recognition [Abstract]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense				3,100
Net income attributable to HEICO				$ 2,600
Weighted Average Number of Shares Outstanding, Diluted				679,000					781,000
Share-based Compensation									$ 3,100
Proceeds and Excess Tax Benefit from Share-based Compensation									$ 3,100

ACQUISITIONS ACQUISITIONS (Deta

ACQUISITIONS ACQUISITIONS (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Business Acquisition [Line Items]
Cash paid, net	$ 418,265	$ 263,811	$ 166,784
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	(220)
Total purchase consideration	330,649
Other Acquisitions [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	109,345	11,000	171,829
Cash Acquired from Acquisition	(7,712)		(5,062)
Cash paid, net	101,633	11,000	166,767
Contingent purchase consideration		1,225	21,355
Additional purchase consideration			211
Total purchase consideration	$ 101,633	$ 12,225	$ 187,911

ACQUISITIONS ACQUISITIONS (De48

ACQUISITIONS ACQUISITIONS (Details 2) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Assets acquired:
Goodwill	$ 1,081,306	$ 865,717	$ 766,639
Electronic Technologies Group [Member]
Assets acquired:
Goodwill	692,700	$ 529,036	$ 429,132
Electronic Technologies Group [Member] | AAT [Member]
Assets acquired:
Goodwill	160,903
Accounts receivable	6,115
Inventories	5,923
Property, plant and equipment	1,246
Other assets	208
Total assets acquired, excluding cash	333,395
Liabilities assumed:
Accounts payable	1,290
Accrued expenses	1,456
Total liabilities assumed	2,746
Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	330,649
Customer Relationships [Member] | Electronic Technologies Group [Member] | AAT [Member]
Assets acquired:
Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	100,000
Intellectual Property [Member] | Electronic Technologies Group [Member] | AAT [Member]
Assets acquired:
Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	39,000
Trade Names [Member] | Electronic Technologies Group [Member] | AAT [Member]
Assets acquired:
Identifiable intangible assets	$ 20,000

ACQUISITIONS ACQUISITIONS (De49

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	$ 2.36	$ 1.97
Pro Forma Earnings Per Share, Diluted	$ 2.29	$ 1.94

ACQUISITIONS ACQUISITIONS (De50

ACQUISITIONS ACQUISITIONS (Details 4) - Electronic Technologies Group [Member] - Robertson [Member] $ in Thousands	12 Months Ended
	Oct. 31, 2017USD ($)
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, 2017	Oct. 31, 2016	Oct. 31, 2015
Assets acquired:
Goodwill	$ 1,081,306	$ 865,717	$ 766,639
Electronic Technologies Group [Member]
Assets acquired:
Goodwill	692,700	$ 529,036	$ 429,132
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
Customer Relationships [Member] | Electronic Technologies Group [Member] | Robertson [Member]
Assets acquired:
Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	55,100
Intellectual Property [Member] | Electronic Technologies Group [Member] | Robertson [Member]
Assets acquired:
Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	39,600
Trade Names [Member] | Electronic Technologies Group [Member] | Robertson [Member]
Assets acquired:
Identifiable intangible assets	$ 28,400

ACQUISITIONS ACQUISITIONS (De52

ACQUISITIONS ACQUISITIONS (Details 6) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2015
FY 2015 Acquisition [Member]
Business Acquisition [Line Items]
Pro Forma Revenue	$ 1,244,911
Pro Forma Net Income (Loss) Attributable to HEICO	$ 163,012
Pro Forma Net Income (Loss) Per Share Attributable To Common Shareholders [Abstract]
Pro Forma Earnings Per Share, Basic	$ 1.69
Pro Forma Earnings Per Share, Diluted	$ 1.66
Pro Forma Net Income Attributable to Parent	$ 140,771
Electronic Technologies Group [Member] | Robertson [Member]
Business Acquisition [Line Items]
Pro Forma Revenue		$ 1,275,926
Pro Forma Net Income (Loss) Attributable to HEICO		$ 162,645
Pro Forma Net Income (Loss) Per Share Attributable To Common Shareholders [Abstract]
Pro Forma Earnings Per Share, Basic		$ 1.71
Pro Forma Earnings Per Share, Diluted		$ 1.68
Pro Forma Net Income Attributable to Parent		$ 142,445

ACQUISITIONS ACQUISITIONS (De53

ACQUISITIONS ACQUISITIONS (Details 7) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Business Acquisition [Line Items]
Cash paid, net	$ 418,265	$ 263,811	$ 166,784
Other Acquisitions [Member]
Business Acquisition [Line Items]
Cash paid	109,345	11,000	171,829
Less: cash acquired	(7,712)		(5,062)
Cash paid, net	101,633	11,000	166,767
Contingent purchase consideration		1,225	21,355
Additional purchase consideration			(211)
Total purchase consideration	$ 101,633	$ 12,225	$ 187,911

ACQUISITIONS ACQUISITIONS (De54

ACQUISITIONS ACQUISITIONS (Details 8) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Assets acquired:
Goodwill	$ 1,081,306	$ 865,717	$ 766,639
Other Acquisitions [Member]
Assets acquired:
Goodwill	48,960	6,876	88,602
Inventories	27,271	249	18,055
Accounts receivable	15,169	0	10,719
Property, plant and equipment	4,503	0	16,031
Other assets	976	0	2,547
Total assets acquired, excluding cash	145,079	12,225	238,935
Liabilities assumed:
Accounts payable	7,696	0	4,845
Accrued expenses	6,016	0	2,570
Deferred income taxes	4,984	0	6,764
Other liabilities	1,411	0	621
Total liabilities assumed	20,107	0	14,800
Noncontrolling interests in consolidated subsidiaries	23,339	0	36,224
Net assets acquired, excluding cash	101,633	12,225	187,911
Customer Relationships [Member] | Other Acquisitions [Member]
Assets acquired:
Identifiable intangible assets	29,500	2,800	58,410
Trade Names [Member] | Other Acquisitions [Member]
Assets acquired:
Identifiable intangible assets	16,750	300	14,094
Intellectual Property [Member] | Other Acquisitions [Member]
Assets acquired:
Identifiable intangible assets	1,950	2,000	29,177
Licensing Agreements [Member] | Other Acquisitions [Member]
Assets acquired:
Identifiable intangible assets	$ 0	$ 0	$ 1,300

ACQUISITIONS ACQUISITIONS (De55

ACQUISITIONS ACQUISITIONS (Details 9)	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years	11 years	10 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	13 years	15 years	12 years
Licensing Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			11 years

ACQUISITIONS ACQUISITIONS (De56

ACQUISITIONS ACQUISITIONS (Details 10) - FY 2015 Acquisition [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Oct. 31, 2017USD ($)$ / shares
Business Acquisition [Line Items]
Pro Forma Revenue	$ 1,244,911
Net income from consolidated operations	163,012
Pro Forma Net Income Attributable to Parent	$ 140,771
Pro Forma Net Income (Loss) Per Share Attributable To Common Shareholders [Abstract]
Pro Forma Earnings Per Share, Basic | $ / shares	$ 1.69
Pro Forma Earnings Per Share, Diluted | $ / shares	$ 1.66

ACQUISITIONS (Details Textuals)

ACQUISITIONS (Details Textuals) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired									$ 418,265	$ 263,811	$ 166,784
Net sales	$ 421,224	$ 391,500	$ 368,657	$ 343,432	$ 363,299	$ 356,084	$ 350,648	$ 306,227	1,524,813	1,376,258	1,188,648
Net income attributable to HEICO	53,674	$ 45,698	$ 45,686	$ 40,927	44,262	$ 42,002	$ 38,657	$ 31,271	185,985	156,192	$ 133,364
Contingent consideration, liability	$ 27,573				18,881				$ 27,573	18,881
Business Acquisition, Transaction Costs					3,200					$ 3,200
Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									12 years	11 years	10 years
Intellectual Property [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									13 years	15 years	12 years
FY 2017 Acquisition [Member]
Business Acquisition [Line Items]
Net sales									$ 49,000
Pro Forma Revenue										$ 1,464,500
AAT [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired									316,632
Cash Acquired from Acquisition									$ 868
CBD [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Carbon by Design
Date on which the acquirer obtains control of the acquiree									Jun. 30, 2017
Description of the 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]
Name of the entity in which interest is owned									Air Cost Control
Date on which the acquirer obtains control of the acquiree									Apr. 30, 2017
Description of the 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%
Percentage of interest owned by noncontrolling shareholders	19.90%								19.90%
FY 2015 Acquisition [Member]
Business Acquisition [Line Items]
Net sales									$ 62,900
Pro Forma Revenue									1,244,911
Net income attributable to HEICO									$ 7,900
Astroseal Products Manufacturing Corp [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Astroseal Products Mfg. Corporation
Date on which the acquirer obtains control of the acquiree									Aug. 31, 2015
Description of the acquired entity									Astroseal manufactures expanded foil mesh, which is integrated into composite aerospace structures for lightning strike protection in fixed and rotary wing aircraft.
Midwest Microwave Solutions [Member] | HEICO Electronic [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Midwest Microwave Solutions, Inc.
Date on which the acquirer obtains control of the acquiree									Aug. 31, 2015
Description of the acquired entity									MMS designs, manufactures and sells unique Size, Weight, Power and Cost (SWAP-C) optimized Communications and Electronic Intercept Receivers and Tuners for military and intelligence applications.
Percentage of interest acquired in the subsidiary	80.10%								80.10%
Percentage of interest owned by noncontrolling shareholders	19.90%								19.90%
Aerospace & Commercial Technologies [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Aerospace & Commercial Technologies, LLC
Date on which the acquirer obtains control of the acquiree									Aug. 31, 2015
Description of the acquired entity									ACT is a provider of products and services necessary to maintain up-to-date F-16 fighter aircraft operational capabilities.
Percentage of interest acquired in the subsidiary	80.10%								80.10%
Percentage of interest owned by noncontrolling shareholders	19.90%								19.90%
TEP [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Thermal Energy Products, Inc.
Date on which the acquirer obtains control of the acquiree									May 31, 2015
Description of the acquired entity									TEP engineers, designs and manufactures removable/reusable insulation systems for industrial, commercial, aerospace and defense applications.
Harter [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Harter Aerospace, LLC
Date on which the acquirer obtains control of the acquiree									Jan. 31, 2015
Description of the acquired entity									Harter is a globally recognized component and accessory maintenance, repair, and overhaul (MRO) station specializing in commercial aircraft accessories, including thrust reverse actuation systems and pneumatics, and electromechanical components.
Percentage of interest acquired in the subsidiary	80.10%								80.10%
Percentage of interest owned by noncontrolling shareholders	19.90%								19.90%
Aeroworks [Member] | Heico Flight Support Corp [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									Aeroworks International Holding B.V.
Date on which the acquirer obtains control of the acquiree									Jan. 31, 2015
Description of the acquired entity									Aeroworks, which is headquartered in the Netherlands and maintains a significant portion of its production facilities in Thailand and Laos, is a manufacturer of both composite and metal parts used primarily in aircraft interior applications, including seating, galleys, lavatories, doors, and overhead bins.
Percentage of interest acquired in the subsidiary	80.00%								80.00%
Percentage of interest owned by noncontrolling shareholders	20.00%								20.00%
Electronic Technologies Group [Member]
Business Acquisition [Line Items]
Net sales									$ 574,261	511,272	$ 390,982
Electronic Technologies Group [Member] | FY 2017 Acquisition [Member]
Business Acquisition [Line Items]
Contingent consideration, liability	$ 13,600								13,600
Amount of contingent purchase consideration, the company could be required to pay	20,000								$ 20,000
Electronic Technologies Group [Member] | AAT [Member]
Business Acquisition [Line Items]
Name of the entity in which interest is owned									AeroAntenna Technology, Inc.
Date on which the acquirer obtains control of the acquiree									Sep. 15, 2017
Net sales										10,200
Pro Forma Revenue									$ 1,582,653	1,428,336
Net income attributable to HEICO										2,500
Description of the 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
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]
Name of the entity in which interest is owned									Robertson Fuel Systems, LLC
Cash Acquired from Acquisition									$ 3,271
Date on which the acquirer obtains control of the acquiree									Jan. 11, 2016
Net sales										84,100
Pro Forma Revenue											$ 1,275,926
Net income attributable to HEICO										12,300
Description of the acquired entity									Robertson designs and produces mission-extending, crashworthy and ballistically self-sealing auxiliary fuel systems for military rotorcraft.
Business Acquisition, Transaction Costs					$ 3,100					$ 3,100
Electronic Technologies Group [Member] | Robertson [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									15 years
Electronic Technologies Group [Member] | Robertson [Member] | Intellectual Property [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									22 years
Electronic Technologies Group [Member] | Certain Assets [Member]
Business Acquisition [Line Items]
Date on which the acquirer obtains control of the acquiree									Dec. 31, 2015
Description of the acquired entity									designs and manufactures underwater locator beacons used to locate aircraft cockpit voice recorders, flight data recorders, marine ship voyage recorders and other devices which have been submerged under water

SELECTED FINANCIAL STATEMENT 58

SELECTED FINANCIAL STATEMENT INFORMATION, Accounts Receivable (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016
Accounts receivable	$ 225,462	$ 205,386
Less: Allowance for doubtful accounts	(3,006)	(3,159)
Accounts receivable, net	$ 222,456	$ 202,227

SELECTED FINANCIAL STATEMENT 59

SELECTED FINANCIAL STATEMENT INFORMATION, Costs and Estimated Earnings on Uncompleted Percentage-of-Completion Contracts (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Costs incurred on uncompleted contracts	$ 29,491	$ 19,086
Estimated earnings	19,902	13,887
Total cost incurred and estimated earnings on uncompleted percentage-of completed contracts	49,393	32,973
Less: Billings to date	(41,262)	(39,142)
Unbilled Contracts Receivable	8,131
Billings in Excess of Cost and Estimated Earnings		(6,169)
Included in the accompanying Consolidated Balance Sheets under the following captions:
Accounts receivable, net (costs and estimated earnings in excess of billings)	9,377	4,839
Accrued expenses and other current liabilities (billings in excess of costs and estimated earnings)	(1,246)	(11,008)
Unbilled Contracts Receivable	$ 8,131
Billings in Excess of Cost and Estimated Earnings		$ (6,169)

SELECTED FINANCIAL STATEMENT 60

SELECTED FINANCIAL STATEMENT INFORMATION, Inventories (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016
Finished products	$ 173,559	$ 131,008
Work in process	39,986	36,076
Materials, parts, assemblies and supplies	128,031	117,153
Contracts-in-process	2,415	3,253
Less: Billings to date	(363)	(1,188)
Inventories, net of valuation reserves	$ 343,628	$ 286,302

SELECTED FINANCIAL STATEMENT 61

SELECTED FINANCIAL STATEMENT INFORMATION, Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Property, Plant and Equipment [Line Items]
Land	$ 5,435	$ 5,090
Buildings and improvements	91,916	79,205
Machinery, equipment and tooling	191,298	171,717
Construction in progress	5,553	10,453
Property, Plant and Equipment, Gross	294,202	266,465
Less: Accumulated depreciation and amortization	(164,319)	(144,854)
Property, plant and equipment, net	$ 129,883	$ 121,611	$ 105,670

SELECTED FINANCIAL STATEMENT 62

SELECTED FINANCIAL STATEMENT INFORMATION, Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016
Accrued employee compensation and related payroll taxes	$ 78,058	$ 67,660
Deferred revenue	29,247	32,135
Accrued customer rebates and credits	12,866	11,881
Accrued additional purchase consideration	7,588	6,918
Other Liabilities, Current	19,853	17,459
Accrued expenses and other current liabilities	$ 147,612	$ 136,053

SELECTED FINANCIAL STATEMENT 63

SELECTED FINANCIAL STATEMENT INFORMATION SELECTED FINANCIAL STATEMENT INFORMATION, Research and Development Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
R&D expenses	$ 46,473	$ 44,726	$ 38,747

SELECTED FINANCIAL STATEMENT 64

SELECTED FINANCIAL STATEMENT INFORMATION SELECTED FINANCIAL STATEMENT INFORMATION, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Balance Start	$ (25,326)
Unrealized gain/(loss)	15,696	$ (308)	$ (17,651)
Amortization of unrealized loss	(46)	0	0
Accumulated Other Comprehensive Income (Loss), Balance End	(10,556)	(25,326)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Balance Start	(23,953)	(24,368)
Unrealized gain/(loss)	14,420	415
Accumulated Other Comprehensive Income (Loss), Balance End	(9,533)	(23,953)	(24,368)
Pension Benefit Obligation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Balance Start	(1,373)	(712)
Unrealized gain/(loss)	321	(661)
Amortization of unrealized loss	29
Accumulated Other Comprehensive Income (Loss), Balance End	(1,023)	(1,373)	(712)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Balance Start	(25,326)	(25,080)
Unrealized gain/(loss)	14,741	(246)
Amortization of unrealized loss	29
Accumulated Other Comprehensive Income (Loss), Balance End	$ (10,556)	$ (25,326)	$ (25,080)

SELECTED FINANCIAL STATEMENT 65

SELECTED FINANCIAL STATEMENT INFORMATION (Details Textuals) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Property, plant and equipment, net	$ 129,883	$ 121,611	$ 105,670
Amortization	42,945	39,916	30,077
Depreciation and amortization	64,823	60,277	47,907
Assets under capital lease	4,800	4,800
Assets under capital lease, accumulated depreciation	1,000	900
Total customer rebates and credits deducted within net sales	$ 11,000	10,800	4,700
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	$ 4,600	6,800	5,700
Deferred compensation plans	122,874	93,202
Costs in Excess of Billings, Current	9,377	4,839
Billings in Excess of Cost, Current	1,246	11,008
Corporate Owned Life Insurance [Member]
Deferred compensation plans	117,200	88,500
Other Deferred Compensation Plan [Member]
Employee related deferred compensation plans, specified as other long-term liabilities	5,700	4,700
Leadership Compensation Plan [Member]
Employee related deferred compensation plans, specified as other long-term liabilities	116,000	87,900
Tooling [Member]
Property, plant and equipment, net	7,600	7,700
Amortization	2,700	2,900	2,400
Property, Plant and Equipment, Exclusive of Tooling [Member]
Depreciation and amortization	$ 21,900	$ 20,400	$ 17,800

GOODWILL AND OTHER INTANGIBLE66

GOODWILL AND OTHER INTANGIBLE ASSETS, Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Goodwill [Roll Forward]
Opening Balances	$ 865,717	$ 766,639
Goodwill acquired	209,863	100,301
Foreign currency translation adjustments	5,726	(681)
Adjustments to goodwill		(542)
Ending Balances	1,081,306	865,717
Flight Support Group [Member]
Goodwill [Roll Forward]
Opening Balances	336,681	337,507
Goodwill acquired	48,960	0
Foreign currency translation adjustments	2,965	(256)
Adjustments to goodwill		(570)
Ending Balances	388,606	336,681
Electronic Technologies Group [Member]
Goodwill [Roll Forward]
Opening Balances	529,036	429,132
Goodwill acquired	160,903	100,301
Foreign currency translation adjustments	2,761	(425)
Adjustments to goodwill		28
Ending Balances	$ 692,700	$ 529,036

GOODWILL AND OTHER INTANGIBLE67

GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016
Amortizing Assets:
Customer Relationships, Gross	$ 379,966	$ 248,271
Intellectual Property, Gross	181,811	139,817
License, Gross	6,559	6,559
Patents, Gross	870	779
Noncompete Agreements, Gross	817	811
Trade Names, Gross	466	466
Gross Carrying Amount	570,489	396,703
Accumulated Amortization	(166,344)	(125,813)
Amortizing Net Carrying Amount	404,145	270,890
Non-Amortizing Assets:
Indefinite-Lived Trade Names	133,936	95,973
Total Gross Carrying Amount	704,425	492,676
Total Net Carrying Amount	538,081	366,863
Customer Relationships [Member]
Amortizing Assets:
Accumulated Amortization	(117,069)	(88,829)
Amortizing Net Carrying Amount	262,897	159,442
Intellectual Property [Member]
Amortizing Assets:
Accumulated Amortization	(44,861)	(33,291)
Amortizing Net Carrying Amount	136,950	106,526
Licensing Agreements [Member]
Amortizing Assets:
Accumulated Amortization	(2,928)	(2,325)
Amortizing Net Carrying Amount	3,631	4,234
Patents [Member]
Amortizing Assets:
Accumulated Amortization	(551)	(480)
Amortizing Net Carrying Amount	319	299
Noncompete Agreements [Member]
Amortizing Assets:
Accumulated Amortization	(817)	(811)
Amortizing Net Carrying Amount	0	0
Trade Names [Member]
Amortizing Assets:
Accumulated Amortization	(118)	(77)
Amortizing Net Carrying Amount	$ 348	$ 389

GOODWILL AND OTHER INTANGIBLE68

GOODWILL AND OTHER INTANGIBLE ASSETS (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization expense related to intangible assets	$ 39.5	$ 36.4	$ 27
Estimated Amortization expense related to intangible assets, year one	48.3
Estimated Amortization expense related to intangible assets, year two	46
Estimated Amortization expense related to intangible assets, year three	43.2
Estimated Amortization expense related to intangible assets, year four	40.5
Estimated Amortization expense related to intangible assets, year five	35.1
Estimated Amortization expense related to intangible assets, year, there after	$ 191
Customer Relationships [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Weighted average amortization period (in years)	12 years	11 years	10 years
Intellectual Property [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Weighted average amortization period (in years)	13 years	15 years	12 years
Licensing Agreements [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Weighted average amortization period (in years)			11 years

LONG-TERM DEBT (Details)

LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016
Borrowings under revolving credit facility	$ 671,000	$ 455,083
Capital leases and notes payable	2,979	3,142
Total debt and capital leases	673,979	458,225
Less: Current maturities of long-term debt	(451)	(411)
Long-term debt, net of current maturities	$ 673,528	$ 457,814

LONG-TERM DEBT, Future Lease Pa

LONG-TERM DEBT, Future Lease Payments (Details) $ in Thousands	Oct. 31, 2017USD ($)
Lease payments in year one	$ 575
Lease payments in year two	575
Lease payments in year three	525
Lease payments in year four	519
Lease payments in year five	509
Thereafter	622
Total minimum lease payments	3,325
Less: amount representing interest	(461)
Present value of minimum lease payments	$ 2,864

LONG-TERM DEBT (Details Textual

LONG-TERM DEBT (Details Textuals) $ in Thousands, € in Millions	Dec. 15, 2017	Nov. 06, 2017USD ($)	Oct. 31, 2017USD ($)	Oct. 31, 2016USD ($)	Oct. 31, 2015EUR (€)
Debt Instrument [Line Items]
Long-term Line of Credit			$ 671,000	$ 455,083
Amended Revolving Credit Facility1 [Member]
Credit Facility [Abstract]
Credit Facility, Current Borrowing Capacity			800,000
Foreign Line of Credit [Member]
Credit Facility [Abstract]
Credit Facility, Maximum Borrowing Capacity			$ 50,000
Prior Credit Facility [Member]
Debt Instrument [Line Items]
Interest Rate			2.40%	1.60%
Credit Facility [Abstract]
Credit Facility, Current Borrowing Capacity			$ 670,000
Credit facility, interest rate description			Advances under the Prior Credit Facility accrued interest at the Company’s choice of the “Base Rate” or the London Interbank Offered Rate (“LIBOR”) plus the applicable margin (based on the Company’s ratio of total funded debt to earnings before interest, taxes, depreciation and amortization, noncontrolling interests and non-cash charges, or “leverage ratio”). The Base Rate was the highest of (i) the Prime Rate; (ii) the Federal Funds rate plus .50% per annum; and (iii) the Adjusted LIBO Rate determined on a daily basis for an Interest Period of one month plus 1.00% per annum, as such capitalized terms were defined in the Prior Credit Facility.
Prior Credit Facility [Member] | Minimum [Member]
Credit Facility [Abstract]
Credit facility unused capacity, commitment fee percentage			0.125%
Prior Credit Facility [Member] | Maximum [Member]
Credit Facility [Abstract]
Credit facility unused capacity, commitment fee percentage			0.35%
Prior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Credit Facility [Abstract]
Credit Facility, Interest Rate, Increase (Decrease)			0.75%
Prior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Credit Facility [Abstract]
Credit Facility, Interest Rate, Increase (Decrease)			2.25%
Prior Credit Facility [Member] | Base Rate [Member] | Minimum [Member]
Credit Facility [Abstract]
Credit Facility, Interest Rate, Increase (Decrease)			0.00%
Prior Credit Facility [Member] | Base Rate [Member] | Maximum [Member]
Credit Facility [Abstract]
Credit Facility, Interest Rate, Increase (Decrease)			1.25%
Amended Credit Revolving Facility2 [Member]
Credit Facility [Abstract]
Credit Facility, Current Borrowing Capacity			$ 1,000,000
Euro Member Countries, Euro | Prior Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt | €					€ 32
Subsequent Event [Member]
Debt Instrument [Line Items]
Subsequent Event, Date	Dec. 15, 2017
Subsequent Event [Member] | New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Subsequent Event, Date		Nov. 6, 2017
Credit Facility [Abstract]
Credit Facility, Expiration Date		Nov. 30, 2022
Credit Facility, Current Borrowing Capacity		$ 1,300,000
Line of Credit Facility Change in Borrowing Capacity		350,000
Credit Facility, Maximum Borrowing Capacity		$ 1,650,000
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.
Subsequent Event [Member] | New Revolving Credit Facility [Member] | Minimum [Member]
Credit Facility [Abstract]
Credit facility unused capacity, commitment fee percentage		0.125%
Subsequent Event [Member] | New Revolving Credit Facility [Member] | Maximum [Member]
Credit Facility [Abstract]
Credit facility unused capacity, commitment fee percentage		0.30%
Subsequent Event [Member] | New Revolving Credit Facility [Member] | Eurodollar [Member] | Minimum [Member]
Credit Facility [Abstract]
Credit Facility, Interest Rate, Increase (Decrease)		1.00%
Subsequent Event [Member] | New Revolving Credit Facility [Member] | Eurodollar [Member] | Maximum [Member]
Credit Facility [Abstract]
Credit Facility, Interest Rate, Increase (Decrease)		2.00%
Subsequent Event [Member] | New Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]
Credit Facility [Abstract]
Credit Facility, Interest Rate, Increase (Decrease)		0.00%
Subsequent Event [Member] | New Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]
Credit Facility [Abstract]
Credit Facility, Interest Rate, Increase (Decrease)		1.00%
Subsequent Event [Member] | Foreign Line of Credit [Member]
Credit Facility [Abstract]
Credit Facility, Maximum Borrowing Capacity		$ 100,000
Subsequent Event [Member] | Letter of Credit [Member]
Credit Facility [Abstract]
Credit Facility, Maximum Borrowing Capacity		$ 50,000

INCOME TAXES INCOME TAXES, Dome

INCOME TAXES INCOME TAXES, Domestic and Foreign Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Income Tax Disclosure [Abstract]
Domestic	$ 264,420	$ 227,927	$ 206,612
Foreign	33,540	29,123	18,352
Income before taxes and noncontrolling interests	$ 297,960	$ 257,050	$ 224,964

INCOME TAXES, Current and Defer

INCOME TAXES, Current and Deferred Expense Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Current:
Federal	$ 85,047	$ 75,261	$ 65,857
State	6,820	7,463	8,559
Foreign	9,529	7,370	4,064
Current income tax expense	101,396	90,094	78,480
Deferred:
Federal	(9,661)	(5,979)	(4,459)
State	(499)	(2,587)	(1,907)
Foreign	(936)	(628)	(714)
Deferred Income Tax Expense (Benefit)	(11,096)	(9,194)	(7,080)
Income tax expense	$ 90,300	$ 80,900	$ 71,400

INCOME TAXES, Rate Reconciliati

INCOME TAXES, Rate Reconciliation (Details)	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Federal statutory income tax rate	35.00%	35.00%	35.00%
State taxes, less applicable federal income tax reduction	1.90%	1.70%	2.40%
Research and development tax credits	(1.80%)	(2.70%)	(1.90%)
Tax-exempt (gains) losses on corporate-owned life insurance policies	(1.80%)	(0.10%)	0.10%
Domestic production activities tax deduction	(1.10%)	(1.30%)	(1.20%)
Tax benefit related to stock option exercises (ASU 2016-09 adoption)	(1.00%)	(0.00%)	(0.00%)
Noncontrolling interests' share of income	0.70%	0.70%	1.30%
Foreign taxes, where permanently reinvested outside of the U.S.	0.40%	0.80%	0.80%
Other, net	0.20%	0.40%	(0.60%)
Effective tax rate	30.30%	31.50%	31.70%

INCOME TAXES, Deferred Tax Asse

INCOME TAXES, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016
Deferred tax assets:
Deferred compensation liability	$ 47,093	$ 36,134
Inventories	31,797	27,969
Share-based compensation	12,984	11,338
Bonus accrual	4,956	4,744
Vacation accrual	2,112	2,127
Customer rebates accrual	1,864	1,917
Deferred revenue	730	1,365
R and D carryforward and credit	645	2,057
Other	8,585	8,489
Deferred Tax Assets, Gross	110,766	96,140
Deferred tax liabilities:
Goodwill and other intangible assets	(160,158)	(150,185)
Property, plant and equipment	(7,887)	(8,291)
Other	(1,747)	(2,156)
Total deferred tax liabilities	(169,792)	(160,632)
Net deferred tax liabilities	$ (59,026)	$ (64,492)

INCOME TAXES, Deferred Tax Liab

INCOME TAXES, Deferred Tax Liability Balance Sheet Classifications (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016
Long-term liability	$ (59,026)	$ (64,899)
Long-term asset	0	407
Net deferred tax liabilities	$ (59,026)	$ (64,492)

INCOME TAXES, Unrecognized Tax

INCOME TAXES, Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balances as of beginning of year	$ 1,602	$ 787
Increases related to current year tax positions	596	524
Increases related to prior year tax positions	0	521
Decreases related to prior year tax positions	(24)	(14)
Lapse of statutes of limitations	(134)	(216)
Balances as of end of year	$ 2,040	$ 1,602

INCOME TAXES (Details Textuals)

INCOME TAXES (Details Textuals) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jan. 31, 2017	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective Income Tax Rate, Continuing Operations		30.30%	31.50%	31.70%
Net deferred tax liability		$ (59,026)	$ (64,492)
Deferred Income Tax Expense (Benefit)		(11,096)	(9,194)	$ (7,080)
Gross unrecognized tax benefits related to uncertain tax positions		2,040	1,602	$ 787
Unrecognized tax benefits that would impact effective tax rate		$ 1,300	$ 1,000
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, 2017	Oct. 31, 2016
Assets [Abstract]
Deferred Compensation Plan Assets	$ 122,874,000	$ 93,202,000
Liabilities [Abstract]
Contingent consideration, liability	27,573,000	18,881,000
Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	9,654,000	7,148,000
Liabilities [Abstract]
Contingent consideration, liability	0	0
Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	113,220,000	86,054,000
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	27,573,000	18,881,000
Corporate Owned Life Insurance [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	113,220,000	86,004,000
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	113,220,000	86,004,000
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	3,972,000	2,515,000
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	3,972,000	2,515,000
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	2,895,000	1,832,000
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	2,895,000	1,832,000
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	1,541,000	1,758,000
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	1,541,000	1,758,000
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	1,246,000	1,093,000
Other Defined Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	1,246,000	1,043,000
Other Defined Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Deferred Compensation Plan Assets	0	50,000
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]	12 Months Ended
	Oct. 31, 2017
FY 2016 Acquisition [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	3.40%
FY 2016 Acquisition [Member] | Minimum [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	4.00%
FY 2016 Acquisition [Member] | Maximum [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	12.00%
FY 2017 Acquisition [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	4.70%
FY 2017 Acquisition [Member] | Minimum [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Negative Long-term Revenue Growth Rate	(8.00%)
FY 2017 Acquisition [Member] | Maximum [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	4.00%
FY 2015 Acquisition [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	0.80%
FY 2015 Acquisition [Member] | Minimum [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	8.00%
FY 2015 Acquisition [Member] | Maximum [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	13.00%

FAIR VALUE MEASUREMENTS, Asse81

FAIR VALUE MEASUREMENTS, Assets and Liabilities, Measured at Fair Value Using Unobservable Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ (1,100)	$ (3,063)	$ (293)
Liabilities, Ending Balance	27,573
Liabilities [Abstract]
Total liabilities	1,133,016	851,195
Fair Value, Inputs, Level 3 [Member]
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Liabilities, Opening Balance	18,881	21,405
Contingent purchase consideration	13,797	1,225
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(7,039)	(6,960)
Contingent consideration related to acquisition	1,100	3,063
Liabilities, Ending Balance		18,881	$ 21,405
Liabilities [Abstract]
Accrued Liabilities, Current	7,368
Other Liabilities, Noncurrent	20,205
Total liabilities	27,573
Foreign Currency Gain (Loss) [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ 834	$ 148

FAIR VALUE MEASUREMENTS (Detail

FAIR VALUE MEASUREMENTS (Details Textuals) $ in Thousands, € in Millions	12 Months Ended
	Oct. 31, 2017USD ($)	Oct. 31, 2017EUR (€)	Oct. 31, 2016USD ($)	Oct. 31, 2015USD ($)	Oct. 31, 2017EUR (€)
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration, liability	$ 27,573		$ 18,881
Change in value of contingent consideration	1,100		3,063	$ 293
Fair Value, Inputs, Level 3 [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration, liability	27,573		18,881
Contingent consideration related to acquisition	1,100		3,063
Change in value of contingent consideration	$ 7,039		$ 6,960
Fair Value, Inputs, Level 3 [Member] | FY 2016 Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair Value Inputs, Discount Rate	3.40%	3.40%
Fair Value, Inputs, Level 3 [Member] | FY 2016 Acquisition [Member] | Minimum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	4.00%	4.00%
Fair Value, Inputs, Level 3 [Member] | FY 2016 Acquisition [Member] | Maximum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	12.00%	12.00%
Fair Value, Inputs, Level 3 [Member] | FY 2015 Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair Value Inputs, Discount Rate	0.80%	0.80%
Fair Value, Inputs, Level 3 [Member] | FY 2015 Acquisition [Member] | Minimum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	8.00%	8.00%
Fair Value, Inputs, Level 3 [Member] | FY 2015 Acquisition [Member] | Maximum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	13.00%	13.00%
Fair Value, Inputs, Level 3 [Member] | FY 2017 Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair Value Inputs, Discount Rate	4.70%	4.70%
Fair Value, Inputs, Level 3 [Member] | FY 2017 Acquisition [Member] | Maximum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	4.00%	4.00%
Flight Support Group [Member] | FY 2015 Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair Value Assumptions, Expected Term	3 years	3 years
Payment for Contingent Consideration Liability, Financing Activities	$ 6,800
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	$ 2,000
Fair Value Assumptions, Expected Term	5 years	5 years
Payment for Contingent Consideration Liability, Financing Activities	$ 300
Contingent consideration, liability	1,400
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
Fair Value Assumptions, Expected Term	6 years	6 years
Contingent consideration, liability	$ 13,600
Euro Member Countries, Euro | Flight Support Group [Member] | FY 2015 Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Amount of contingent purchase consideration, the company could be required to pay | €					€ 18.3
Payment for Contingent Consideration Liability, Financing Activities | €		€ 6.1
Contingent consideration, liability	$ 12,600				10.8
Contingent Consideration Arrangements, Per Year Amount | €					€ 6.1

SHAREHOLDERS' EQUITY (Details T

SHAREHOLDERS' EQUITY (Details Textuals)	12 Months Ended
	Oct. 31, 2017$ / sharesshares	Oct. 31, 2016$ / shares	Oct. 31, 2015$ / shares
Stock repurchase program, number of shares authorized to be repurchased (in shares) | shares	3,127,266
Cash dividends per share (in dollars per share) | $ / shares	$ 0.152	$ 0.128	$ 0.112
Stockholders' Equity Note, Stock Split, Conversion Ratio	0.25

SHARE-BASED COMPENSATION, Share

SHARE-BASED COMPENSATION, Share-based Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Shares Available for Grant [Roll Forward]
Opening Balance Outstanding Shares (Shares Available For Grant)	1,290	1,658	2,021
Shares approved by Shareholders (Shares Available for Grant)	3,300
Granted (Available for Grant)	(759)	(375)	(363)
Cancelled (Available for Grant)		7
Ending Balance Outstanding Shares (Shares Available For Grant)	531	1,290	1,658
Shares Outstanding [Roll Forward]
Outstanding (Shares Under Option)	4,173	4,169	4,080
Granted (Shares Under Option)	759	375	363
Exercised (Shares Under Option)	(262)	(364)	(274)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period		(7)
Outstanding (Shares Under Option)	4,670	4,173	4,169
Weighted Average Exercise Price [Roll Forward]
Outstanding (in dollars per share)	$ 22.23	$ 20.42	$ 18.08
Granted (in dollars per share)	64.63	36.84	41.48
Exercised (in dollars per share)	23.85	16.33	13.48
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price		29.10
Outstanding (in dollars per share)	$ 29.04	$ 22.23	$ 20.42

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, 2017	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Number Outstanding (in shares)	4,670	4,173	4,169	4,080
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 29.04	$ 22.23	$ 20.42	$ 18.08
Outstanding Weighted Average Contractual Life (in years)	5 years 1 month
Outstanding Aggregated Intrinsic Value (in dollars)	$ 253,939
Number Exercisable (in shares)	3,113
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 18.80
Exercisable Weighted Average Contractual Life (in years)	3 years 6 months
Exercisable Aggregate Intrinsic Value (in dollars)	$ 205,901
Heico Common Stock [Member]
Number Outstanding (in shares)	2,343
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 25.44
Outstanding Weighted Average Contractual Life (in years)	4 years
Outstanding Aggregated Intrinsic Value (in dollars)	$ 152,858
Number Exercisable (in shares)	1,887
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 17.82
Exercisable Weighted Average Contractual Life (in years)	2 years 11 months
Exercisable Aggregate Intrinsic Value (in dollars)	$ 137,469
Common Class A [Member]
Number Outstanding (in shares)	2,327
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 32.66
Outstanding Weighted Average Contractual Life (in years)	6 years 1 month
Outstanding Aggregated Intrinsic Value (in dollars)	$ 101,081
Number Exercisable (in shares)	1,226
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 20.30
Exercisable Weighted Average Contractual Life (in years)	4 years 3 months
Exercisable Aggregate Intrinsic Value (in dollars)	$ 68,432

SHARE-BASED COMPENSATION, Infor

SHARE-BASED COMPENSATION, Information on Options Exercised (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Proceeds from stock option exercises	$ 5,659	$ 5,924	$ 3,673
Tax benefit from stock option exercises	3,087	868	1,402
Intrinsic value of stock option exercises	$ 10,376	$ 9,751	$ 6,958

SHARE-BASED COMPENSATION, Assum

SHARE-BASED COMPENSATION, Assumptions for Option Grants Fair Value Calculation (Details) - $ / shares	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Common Class A [Member]
Expected stock price volatility	28.18%	32.52%	36.51%
Risk-free interest rate	2.06%	1.82%	2.12%
Dividend yield	0.31%	0.32%	0.32%
Forfeiture rate	0.00%	0.00%	0.00%
Expected option life (years)	7 years	6 years	7 years
Weighted average fair value	$ 19.49	$ 12.38	$ 15.67
Heico Common Stock [Member]
Expected stock price volatility	37.89%	39.63%	39.96%
Risk-free interest rate	2.44%	2.16%	2.30%
Dividend yield	0.26%	0.24%	0.24%
Forfeiture rate	0.00%	0.00%	0.00%
Expected option life (years)	9 years	9 years	9 years
Weighted average fair value	$ 33.38	$ 18.90	$ 22.77

SHARE-BASED COMPENSATION (Detai

SHARE-BASED COMPENSATION (Details Textuals) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Jan. 31, 2017	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Shares approved by Shareholders (Shares Available for Grant)		3,300
Number Outstanding (in shares)		4,670	4,173	4,169	4,080
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		531	1,290	1,658	2,021
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		5 years
Pre-tax unrecognized compensation expense related to nonvested stock options		$ 25,500
Pre-tax unrecognized compensation expense related to nonvested stock options, expected to be recognized over a weighted average period (in years)		3 years 8 months
Fair value of stock options, Vested		$ 5,300	$ 5,800	$ 5,500
Excess tax benefit from stock option exercises			881	1,402
Common Class A [Member]
Number Outstanding (in shares)		2,327
Stock Option and Future Grants [Member]
Shares approved by Shareholders (Shares Available for Grant)		5,200
Number Outstanding (in shares)		4,700
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		500
Employee Stock Option [Member]
Allocated Share-based Compensation Expense		$ 7,400	6,400	5,800
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense		$ 2,600	$ 2,400	$ 2,200
Accounting Standards Update 2016-09 [Member]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 3,100

EMPLOYEE RETIREMENT PLANS EMP89

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Defined Contribution Plan Share-based Activity (Details) - shares shares in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Shares available for issuance, Opening Balance	315	18	85
Shares registered for issuance to the 401(k) Plan		375
Issuance of common stock to 401(k) Plan	(60)	(78)	(67)
Shares available for issuance, Ending Balance	255	315	18
Common Class A [Member]
Defined Contribution Plan Disclosure [Line Items]
Shares available for issuance, Opening Balance	315	18	85
Shares registered for issuance to the 401(k) Plan		375
Issuance of common stock to 401(k) Plan	(60)	(78)	(67)
Shares available for issuance, Ending Balance	255	315	18

EMPLOYEE RETIREMENT PLANS EMP90

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Projected Benefit Obligation and Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Change in projected benefit obligation:
Projected benefit obligation, Opening balance	$ 14,511	$ 14,168
Actuarial gain	(156)	655
Interest cost	561	613	$ 561
Benefits paid	916	925
Projected benefit obligation, Ending balance	14,000	14,511	14,168
Change in plan assets:
Fair value of plan assets, Opening balance	10,510	10,767
Actual return on plan assets	1,048	263
Employer contributions	428	405
Benefits paid	(916)	(925)
Fair value of plan assets, Ending balance	11,070	10,510	$ 10,767
Funded status	$ 2,930	$ 4,001

EMPLOYEE RETIREMENT PLANS EMP91

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Weighted Average Assumptions (Details)	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Weighted Average Discount Rate [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.98%	3.99%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.99%	4.47%	4.20%
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 EMP92

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Net Pension Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	$ 688	$ 702	$ 738
Interest cost	(561)	(613)	(561)
Amortization of unrealized loss	(46)	0	0
Net pension income	$ 81	$ 89	$ 177

EMPLOYEE RETIREMENT PLANS EMP93

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Estimated Future Benefit Payments (Details) $ in Thousands	Oct. 31, 2017USD ($)
Year ending October 31,
Next Twelve Months	$ 895
Year Two	926
Year Three	928
Year Four	898
Year Five	878
Five Fiscal Years Thereafter	$ 4,378

EMPLOYEE RETIREMENT PLANS EMP94

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Plan Assets Fair Value (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 11,070	$ 10,510	$ 10,767
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	11,070	10,510
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	5,593	5,149
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	5,593	5,149
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	5,382	5,219
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	5,382	5,219
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Money Market Funds and Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	95	142
Money Market Funds and Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	95	142
Money Market Funds and Cash [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Money Market Funds and Cash [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0	$ 0

EMPLOYEE RETIREMENT PLANS EMP95

EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS, Actual and Targeted Asset Allocations (Details)	Oct. 31, 2017	Oct. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	50.00%	49.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50.00%	50.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	49.00%	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, Actual Plan Asset Allocations	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, 2017	Oct. 31, 2016	Oct. 31, 2015
Defined contribution plan partcipants range minimum	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	$ 7,800	$ 7,000	$ 6,100
Employer contributions	428	405
Defined Benefit Plan, Funded (Unfunded) Status of Plan	2,930	4,001
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	(1,700)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	156	(655)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax	200	(400)
Defined Benefit Plan, Actuarial Gain (Loss) before Tax	516	$ (1,100)
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	500
Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss), before Tax, Expected Next Fiscal Year	$ (100)
Maximum [Member]
Defined contribution plan partcipants range minimum	50.00%

REDEEMABLE NONCONTROLLING INT97

REDEEMABLE NONCONTROLLING INTERESTS REDEEMABLE NONCONTROLLING INTERESTS (Details)	12 Months Ended
	Oct. 31, 2017
Electronic Technologies Group [Member] | Subsidiary One [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2005
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2018	[1]
Put Rights Purchase Period	4 years	[2]
Electronic Technologies Group [Member] | Subsidiary Four [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2009
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2018	[1]
Put Rights Purchase Period	1 year
Electronic Technologies Group [Member] | Subsidiary Five [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2012
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2018	[1]
Put Rights Purchase Period	2 years
Electronic Technologies Group [Member] | Subsidiary Ten [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2015
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2020
Put Rights Purchase Period	2 years
Flight Support Group [Member] | Subsidiary Two [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2006
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2018	[1]
Put Rights Purchase Period	4 years
Flight Support Group [Member] | Subsidiary Three [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2008
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2018	[1]
Put Rights Purchase Period	5 years
Flight Support Group [Member] | Subsidiary Six [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2012
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Oct. 31, 2018
Put Rights Purchase Period	4 years
Flight Support Group [Member] | Subsidiary Seven [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2012
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 Eight [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2015
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]
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2015
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]
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2015
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]
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2017
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 INT98

REDEEMABLE NONCONTROLLING INTERESTS (Details Textuals) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Business Acquisition [Line Items]
Management's estimate of the aggregate redemption amount of all put rights	$ 131,123	$ 99,512
Estimated Redemption Amount of equity interest redeemable at fair value	82,100
Estimated Redemption Amount of equity interest redeemable based on a multiple of future earnings	49,000
Payments For Repurchase Of Redeemable Noncontrolling Interest	(3,848)	$ (3,599)	$ 0
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Aggregate Redemption Amount Puttable	40,400
Potential Redemption Amount Payable	$ 21,000
FY 2011 Acquisition [Member] | Flight Support Group [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	19.90%
Percentage of company total ownership interest	100.00%
FY 2017 Acquisition [Member]
Business Acquisition [Line Items]
Payments For Repurchase Of Redeemable Noncontrolling Interest	$ (3,800)
FY 2016 Acquisition [Member]
Business Acquisition [Line Items]
Payments For Repurchase Of Redeemable Noncontrolling Interest	$ (3,600)

NET INCOME PER SHARE ATTRIBUT99

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, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Numerator:
Net income attributable to HEICO	$ 53,674	$ 45,698	$ 45,686	$ 40,927	$ 44,262	$ 42,002	$ 38,657	$ 31,271	$ 185,985	$ 156,192	$ 133,364
Denominator:
Weighted average common shares outstanding - basic									84,290	83,807	83,425
Effect of dilutive stock options									2,486	1,406	1,339
Weighted Average Number of Shares Outstanding, Diluted									86,776	85,213	84,764
Earnings Per Share, Basic	$ 0.64	$ 0.54	$ 0.54	$ 0.49	$ 0.53	$ 0.50	$ 0.46	$ 0.37	$ 2.21	$ 1.86	$ 1.60
Earnings Per Share, Diluted	$ 0.62	$ 0.53	$ 0.53	$ 0.47	$ 0.52	$ 0.49	$ 0.45	$ 0.37	$ 2.14	$ 1.83	$ 1.57
Anti-dilutive stock options excluded									511	725	515

QUARTERLY FINANCIAL INFORMAT100

QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Net sales:
Net sales	$ 421,224	$ 391,500	$ 368,657	$ 343,432	$ 363,299	$ 356,084	$ 350,648	$ 306,227	$ 1,524,813	$ 1,376,258	$ 1,188,648
Gross profit:
Gross profit	160,029	148,897	140,382	125,417	135,684	133,583	134,029	112,196
Net income from consolidated operations:
Net income from consolidated operations	59,087	51,475	50,833	46,265	49,521	46,976	43,729	35,924	207,660	176,150	153,564
Net income attributable to HEICO:
Net income attributable to HEICO	$ 53,674	$ 45,698	$ 45,686	$ 40,927	$ 44,262	$ 42,002	$ 38,657	$ 31,271	$ 185,985	$ 156,192	$ 133,364
Basic:
Basic (in dollars per share)	$ 0.64	$ 0.54	$ 0.54	$ 0.49	$ 0.53	$ 0.50	$ 0.46	$ 0.37	$ 2.21	$ 1.86	$ 1.60
Diluted:
Diluted (in dollars per share)	$ 0.62	$ 0.53	$ 0.53	$ 0.47	$ 0.52	$ 0.49	$ 0.45	$ 0.37	$ 2.14	$ 1.83	$ 1.57

QUARTERLY FINANCIAL INFORMAT101

QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details Textuals) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Weighted Average Number of Shares Outstanding, Diluted									86,776,000	85,213,000	84,764,000
Net income attributable to HEICO	$ 53,674	$ 45,698	$ 45,686	$ 40,927	$ 44,262	$ 42,002	$ 38,657	$ 31,271	$ 185,985	$ 156,192	$ 133,364
Earnings Per Share, Basic	$ 0.64	$ 0.54	$ 0.54	$ 0.49	$ 0.53	$ 0.50	$ 0.46	$ 0.37	$ 2.21	$ 1.86	$ 1.60
Earnings Per Share, Diluted	$ 0.62	$ 0.53	$ 0.53	$ 0.47	$ 0.52	$ 0.49	$ 0.45	$ 0.37	$ 2.14	$ 1.83	$ 1.57
Net Income Impact From Research And Development Credits Net Of Expenses								$ 1,700
Impact from US Federal R&D Tax Credit on Earnings Per Share, Basic								$ 0.02
FY 2016 Acquisition [Member]
Business Combination, Acquisition Related Costs								$ 3,100
Impact to Net Income from Acquisition Costs, Net of Tax								$ 2,000
Impact to Net Income from Acquisition Costs, Net of Tax Per Basic and Diluted Share								$ 0.02
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				679,000					781,000
Net income attributable to HEICO				$ 2,600
Earnings Per Share, Basic and Diluted				$ 0.03

OPERATING SEGMENTS (Details)

OPERATING SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items]
Net sales	$ 421,224	$ 391,500	$ 368,657	$ 343,432	$ 363,299	$ 356,084	$ 350,648	$ 306,227	$ 1,524,813	$ 1,376,258	$ 1,188,648
Depreciation									21,878	20,361	17,830
Amortization									42,945	39,916	30,077
Depreciation and amortization									64,823	60,277	47,907
Operating income									306,658	265,345	229,656
Capital expenditures									25,998	30,863	18,249
Total assets	2,512,431				1,998,412				2,512,431	1,998,412	1,700,857
Flight Support Group [Member]
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items]
Net sales									967,540	875,870	809,700
Depreciation									13,042	12,113	10,859
Amortization									18,026	16,590	13,470
Operating income									179,278	163,427	149,798
Capital expenditures									15,665	18,434	11,737
Total assets	1,042,925				877,672				1,042,925	877,672	867,213
Electronic Technologies Group [Member]
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items]
Net sales									574,261	511,272	390,982
Depreciation									8,609	8,030	6,803
Amortization									24,167	22,664	15,945
Operating income									157,451	126,031	98,833
Capital expenditures									10,100	11,962	6,201
Total assets	1,339,363				1,015,696				1,339,363	1,015,696	743,873
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									227	218	168
Amortization									752	662	662
Operating income									(30,071)	(24,113)	(18,975)
Capital expenditures									233	467	311
Total assets	$ 130,143				$ 105,044				130,143	105,044	89,771
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									$ (16,988)	$ (10,884)	$ (12,034)

OPERATING SEGMENTS OPERATING SE

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

3 Months Ended

12 Months Ended

Oct. 31, 2017

Jul. 31, 2017

Apr. 30, 2017

Jan. 31, 2017

Oct. 31, 2016

Jul. 31, 2016

Apr. 30, 2016

Jan. 31, 2016

Oct. 31, 2017

Oct. 31, 2016

Oct. 31, 2015

Product Information [Line Items]

Net sales

$ 421,224

$ 391,500

$ 368,657

$ 343,432

$ 363,299

$ 356,084

$ 350,648

$ 306,227

$ 1,524,813

$ 1,376,258

$ 1,188,648

Flight Support Group [Member]

Product Information [Line Items]

Net sales

967,540

875,870

809,700

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

Product Information [Line Items]

Net sales

[1]

489,644

405,108

356,070

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

Product Information [Line Items]

Net sales

[2]

270,482

251,357

258,952

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

Product Information [Line Items]

Net sales

[3]

207,414

219,405

194,678

Electronic Technologies Group [Member]

Product Information [Line Items]

Net sales

574,261

511,272

390,982

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

Product Information [Line Items]

Net sales

[4]

420,991

371,297

255,095

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

Product Information [Line Items]

Net sales

[5]

153,270

139,975

135,887

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

Product Information [Line Items]

Net sales

$ (16,988)

$ (10,884)

$ (12,034)

[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, 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

[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, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 421,224	$ 391,500	$ 368,657	$ 343,432	$ 363,299	$ 356,084	$ 350,648	$ 306,227	$ 1,524,813	$ 1,376,258	$ 1,188,648
Property, Plant and Equipment, Net	129,883				121,611				129,883	121,611	105,670
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									1,007,491	904,670	785,567
Property, Plant and Equipment, Net	97,367				94,889				97,367	94,889	85,253
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									517,322	471,588	403,081
Property, Plant and Equipment, Net	$ 32,516				$ 26,722				$ 32,516	$ 26,722	$ 20,417

COMMITMENTS AND CONTINGENCIE105

COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	Oct. 31, 2017USD ($)
Year One	$ 13,402
Year Two	12,249
Year Three	11,748
Year Four	10,904
Year Five	9,759
Thereafter	16,065
Total minimum lease commitments	$ 74,127

COMMITMENTS AND CONTINGENCIE106

COMMITMENTS AND CONTINGENCIES (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balances as of beginning of year	$ 3,351	$ 3,203
Accruals for warranties	2,254	3,025
Warranty claims settled	(2,684)	(2,877)
Balances as of end of year	$ 2,921	$ 3,351

COMMITMENTS AND CONTINGENCIE107

COMMITMENTS AND CONTINGENCIES (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Total rent expense charged to operations for operating leases	$ 15.6	$ 14.7	$ 11.9
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 4.2

SUPPLEMENTAL DISCLOSURES OF 108

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Cash paid for income taxes	$ 95,851	$ 87,486	$ 76,021
Cash received from income tax refunds	(2,953)	(1,906)	(1,211)
Cash paid for interest	9,631	8,288	4,598
Additional purchase consideration	220
Additional purchase consideration			(204)
Property, plant and equipment acquired through capital lease obligations	37	1,111	59
Other Acquisitions [Member]
Contingent purchase consideration	$ (13,797)	$ (1,225)	$ (21,355)

SUBSEQUENT EVENT SUBSEQUENT 109

SUBSEQUENT EVENT SUBSEQUENT EVENT (Details) - $ / shares shares in Thousands	Dec. 15, 2017	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Subsequent Event [Line Items]
Earnings Per Share, Basic		$ 0.64	$ 0.54	$ 0.54	$ 0.49	$ 0.53	$ 0.50	$ 0.46	$ 0.37	$ 2.21	$ 1.86	$ 1.60
Earnings Per Share, Diluted		$ 0.62	$ 0.53	$ 0.53	$ 0.47	$ 0.52	$ 0.49	$ 0.45	$ 0.37	$ 2.14	$ 1.83	$ 1.57
Weighted average common shares outstanding - basic										84,290	83,807	83,425
Weighted Average Number of Shares Outstanding, Diluted										86,776	85,213	84,764
FYE 2017 [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Earnings Per Share, Basic	$ 1.77
Earnings Per Share, Diluted	$ 1.71
Weighted average common shares outstanding - basic	105,363
Weighted Average Number of Shares Outstanding, Diluted	108,470
FYE 2016 [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Earnings Per Share, Basic	$ 1.49
Earnings Per Share, Diluted	$ 1.47
Weighted average common shares outstanding - basic	104,758
Weighted Average Number of Shares Outstanding, Diluted	106,516
FYE 2015 [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Earnings Per Share, Basic	$ 1.28
Earnings Per Share, Diluted	$ 1.26
Weighted average common shares outstanding - basic	104,281
Weighted Average Number of Shares Outstanding, Diluted	105,955

SUBSEQUENT EVENT SUBSEQUENT 110

SUBSEQUENT EVENT SUBSEQUENT EVENT (Details Textual) - Subsequent Event [Member]	Dec. 15, 2017	Nov. 30, 2017
Subsequent Event [Line Items]
Subsequent Event, Description	The stock split is payable to shareholders of record as of January 3, 2018 and the Company expects to distribute the additional shares to shareholders on January 17, 2018. Accordingly, the prices of both the Company's Class A Common Stock and Common Stock are anticipated to begin trading on a post-split basis on January 18, 2018. None of the applicable share and per share information in these consolidated financial statements on Form 10-K has been adjusted retrospectively to give effect to the pending 5-for-4 stock split.
Subsequent Event, Date	Dec. 15, 2017
Electronic Technologies Group [Member] | IDC [Member]
Subsequent Event [Line Items]
Subsequent Event, Date		Nov. 30, 2017
Business Acquisition, Name of Acquired Entity		Interface Displays & Controls, Inc.
Business Acquisition, Description of Acquired Entity		IDC designs and manufactures electronic products for aviation, marine, military, fighting vehicles, and embedded computing markets.

VALUATION AND QUALIFYING ACC111

VALUATION AND QUALIFYING ACCOUNTS VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Opening Balance		$ 3,159	$ 2,038	$ 2,143
Valuation Allowances and Reserves, Charged to Cost and Expense		7	390	248
Valuation Allowances and Reserves, Charged to Other Accounts	[1]	298	973	55
Valuation Allowances and Reserves, Deductions	[2]	(458)	(242)	(408)
Valuation Allowances and Reserves, Ending Balance		3,006	3,159	2,038
Inventory Valuation Reserve [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Opening Balance		81,449	69,654	60,608
Valuation Allowances and Reserves, Charged to Cost and Expense		6,284	10,270	7,779
Valuation Allowances and Reserves, Charged to Other Accounts	[3]	6,264	6,268	4,598
Valuation Allowances and Reserves, Deductions	[4]	(1,849)	(4,743)	(3,331)
Valuation Allowances and Reserves, Ending Balance		$ 92,148	$ 81,449	$ 69,654
[1]	Principally additions from acquisitions and foreign currency translation adjustments.
[2]	Principally write-offs of uncollectible accounts receivable, net of recoveries.
[3]	Principally additions from acquisitions and foreign currency translation adjustments
[4]	Principally write-offs of slow-moving, obsolete or damaged inventory