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]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]	Total Shareholders Equity [Member]
Starting Balance at Oct. 31, 2013			$ 268	$ 396	$ 255,889	$ 1,138	$ (1,138)	$ 144	$ 349,649	$ 116,889	$ 723,235
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	$ 86,473							(2,715)	89,188
Comprehensive income (loss)	13,506	$ 4,180								9,326
Comprehensive income (loss)	99,979										95,799
Cash dividends									(31,215)		(31,215)
Issuance of common stock to Savings and Investment Plan					3,849						3,849
Share-based compensation expense					5,873						5,874
Proceeds from stock option exercises					594						594
Tax benefit from stock option exercises					93						93
Redemptions of common stock related to stock option exercises	(273)				(273)						(273)
Distributions to noncontrolling interests		(4,141)								(72,576)	(72,576)
Acquisitions of noncontrolling interests		(1,243)
Reclassification of Redeemable Noncontrolling Interests to Noncontrolling Interests		19,383								19,383	19,383
Adjustments to redemption amount of redeemable noncontrolling interests		(526)							526		526
Other					4					1	5
Ending Balance at Jul. 31, 2014			268	397	266,029	1,138	(1,138)	(2,571)	408,148	73,023	745,294
Starting Balance, Redeemable Noncontrolling Interests at Oct. 31, 2013		59,218
Ending Balance, Redeemable Noncontrolling Interests at Jul. 31, 2014		38,105
Starting Balance at Oct. 31, 2014	774,619		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)	78,841							(16,273)	95,114
Comprehensive income (loss)	13,515	3,880								9,635
Comprehensive income (loss)	92,356										88,476
Cash dividends									(9,343)		(9,343)
Issuance of common stock to Savings and Investment Plan			1		5,090						5,091
Share-based compensation expense					4,394						4,394
Proceeds from stock option exercises				2	3,256						3,258
Tax benefit from stock option exercises					1,404						1,404
Redemptions of common stock related to stock option exercises	(5)				(5)						(5)
Distributions to noncontrolling interests		(3,623)								(3,791)	(3,791)
Adjustments to redemption amount of redeemable noncontrolling interests		7,522							(7,522)		(7,522)
Deferred compensation obligation						158
Deferred compensation obligation							(158)
Other									1		1
Ending Balance at Jul. 31, 2015	856,582		$ 269	$ 399	$ 283,490	$ 1,296	$ (1,296)	$ (24,562)	$ 516,007	$ 80,979	$ 856,582
Starting Balance, Redeemable Noncontrolling Interests at Oct. 31, 2014	39,966	39,966
Increase (Decrease) in Temporary Equity [Roll Forward]
Noncontrolling interests assumed related to acquisitions		17,076
Ending Balance, Redeemable Noncontrolling Interests at Jul. 31, 2015	$ 64,821	$ 64,821