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, 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), Net of Tax, Attributable to Parent	$ 112,860							(8,433)	121,293
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	17,479	$ 5,313								12,166
Comprehensive Income (Loss)	130,339										125,026
Cash dividends									(31,215)		(31,215)
Issuance of common stock to HEICO Savings and Investment Plan					5,504						5,504
Share-based compensation expense					7,425						7,426
Proceeds from stock option exercises				1	708						708
Tax benefit from stock option exercises					93						93
Distributions to noncontrolling interests		(5,908)								(73,304)	(73,304)
Reclassification of redeemable noncontrolling interests to noncontrolling interests										19,383	19,383
Adjustments to redemption amount of redeemable noncontrolling interests		1,969							(1,969)		(1,969)
Adjustments to Additional Paid in Capital, Other					(268)
Other									(1)	(1)	(268)
Balances at Oct. 31, 2014			268	397	269,351	1,138	(1,138)	(8,289)	437,757	75,135	774,619
Redeemable noncontrolling interests at Oct. 31, 2013		59,218
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Redeemable Noncontrolling Interest	17,479	5,313								12,166
Distributions to noncontrolling interests		(5,908)								(73,304)	(73,304)
Acquisitions of noncontrolling interests		(1,243)
Reclassification of redeemable noncontrolling interests to noncontrolling interests2		(19,383)
Adjustments to redemption amount of redeemable noncontrolling interests		1,969							(1,969)		(1,969)
Redeemable noncontrolling interests at Oct. 31, 2014		39,966
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	(27,200)								(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)
Other											4
Balances 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 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	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)
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