CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME - UNAUDITED - USD ($) $ in Thousands	Total	Redeemable Noncontrolling Interests [Member]	Common Stock [Member]	Common Stock [Member] Class A Common Stock [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]
Starting Balance 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	$ 58,860	$ 2,288						(10,925)	60,745		56,572
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	9,040									6,752
Cash dividends									(4,666)		(4,666)
Issuance of common stock to Savings and Investment Plan			1		4,127						4,128
Share-based compensation expense					2,778						2,778
Proceeds from stock option exercises				2	2,952						2,954
Tax benefit from stock option exercises					1,405						1,405
Distributions to noncontrolling interests		(2,651)								(2,082)	(2,082)
Adjustments to redemption amount of redeemable noncontrolling interests		7,304							(7,304)		(7,304)
Deferred compensation obligation						158
Deferred compensation obligation							(158)
Other									2		(3)
Adjustments to Additional Paid in Capital, Other					(5)
Ending Balance at Apr. 30, 2015			269	399	280,608	1,296	(1,296)	(19,214)	486,534	79,805	828,401
Starting Balance, Redeemable Noncontrolling Interests at Oct. 31, 2014		39,966
Increase (Decrease) in Temporary Equity [Roll Forward]
Noncontrolling Interest, Increase from Business Combination		17,007
Ending Balance, Redeemable Noncontrolling Interests at Apr. 30, 2015		63,914
Starting Balance at Oct. 31, 2015	893,271		269	400	286,220	1,783	(1,783)	(25,080)	548,054	83,408	893,271
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	86,201	5,221						5,994	69,928		80,980
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	10,279									5,058
Cash dividends									(5,350)		(5,350)
Issuance of common stock to Savings and Investment Plan			1	1	4,846						4,848
Share-based compensation expense					3,286						3,286
Proceeds from stock option exercises					1,471						1,471
Tax benefit from stock option exercises					870						870
Distributions to noncontrolling interests		(4,086)								(1,421)	(1,421)
Acquisition of noncontrolling interests		(3,599)
Adjustments to redemption amount of redeemable noncontrolling interests		(438)							438		438
Deferred compensation obligation							148
Deferred compensation obligation						(148)
Other									2	50	48
Adjustments to Additional Paid in Capital, Other					(4)
Ending Balance at Apr. 30, 2016	978,441		$ 270	$ 401	$ 296,689	$ 1,635	$ (1,635)	$ (19,086)	$ 613,072	$ 87,095	$ 978,441
Starting Balance, Redeemable Noncontrolling Interests at Oct. 31, 2015	91,282	91,282
Ending Balance, Redeemable Noncontrolling Interests at Apr. 30, 2016	$ 88,380	$ 88,380