SHAREHOLDERS' EQUITY	12 Months Ended
SHAREHOLDERS' EQUITY	Oct. 31, 2019
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, 2019, the maximum number of shares that may yet be purchased under this program was 4,886,353 of either or both of the Company's Class A Common Stock and the Company's Common Stock. The repurchase program does not have a fixed termination date. During fiscal 2019, 2018 and 2017, the Company did not repurchase any shares of Company common stock under this program. During fiscal 2019, the Company repurchased an aggregate 476,586 shares and 111,730 shares of Common Stock and Class A Common Stock, respectively, at a total cost of $53.1 million and $10.9 million, respectively. During fiscal 2018, the Company repurchased an aggregate 332,140 shares and 18,145 shares of Common Stock and Class A Common Stock, respectively, at a total cost of $23.9 million and $1.1 million, respectively. The shares repurchased represent shares tendered as payments to satisfy employee withholding taxes due upon exercises of stock option awards. The shares repurchased in fiscal 2019 and 2018 did not impact the number of shares authorized for future purchase under the Company’s share repurchase program and are reflected as redemptions of common stock related to stock option exercises in the Company's Consolidated Statements of Shareholders' Equity and Consolidated Statements of Cash Flows. Such share repurchases in fiscal 2017 were not material. Noncontrolling Interests Consistent with the Company’s past practice of increasing its ownership in certain non-wholly owned subsidiaries, on June 28, 2019, HEICO Aerospace paid dividends to HEICO and Lufthansa Technik AG (“LHT”) in proportion to their ownership interest in HEICO Aerospace of 80% and 20%, respectively (the “Transaction”). LHT received a cash dividend of $91.5 million that was funded principally using proceeds from the Company’s revolving credit facility. HEICO effectively received as its dividend the 20% noncontrolling interest held by LHT in eight of the Company’s existing subsidiaries within its HEICO Aerospace subsidiary that are principally part of the FSG’s repair and overhaul parts and services product line. HEICO did not record any gain or loss in connection with the Transaction. Immediately following the Transaction, HEICO transferred the eight businesses to HEICO Flight Support Corp., a wholly owned subsidiary of HEICO. LHT remains a 20% owner in HEICO Aerospace, a designer and manufacturer of jet engine and aircraft component replacement parts.