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	$ 92,356	$ 3,880						(16,273)	95,114		88,476
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	13,515									9,635
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
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		(4)
Adjustments to Additional Paid in Capital, Other					(5)
Ending Balance at Jul. 31, 2015			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
Increase (Decrease) in Temporary Equity [Roll Forward]
Noncontrolling Interest, Increase from Business Combination		17,076
Ending Balance, Redeemable Noncontrolling Interests at Jul. 31, 2015		64,821
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	129,538	7,431						2,708	111,930		122,107
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	14,900									7,469
Cash dividends									(10,724)		(10,724)
Issuance of common stock to Savings and Investment Plan			1	1	5,913						5,915
Share-based compensation expense					4,905						4,905
Proceeds from stock option exercises				2	4,829						4,831
Tax benefit from stock option exercises					867						867
Distributions to noncontrolling interests		(7,337)								(8,819)	(8,819)
Adjustments to redemption amount of redeemable noncontrolling interests		129							(129)		(129)
Deferred compensation obligation							148
Deferred compensation obligation						(148)
Other										50	46
Adjustments to Additional Paid in Capital, Other					(4)
Ending Balance at Jul. 31, 2016	1,012,270		$ 270	$ 403	$ 302,730	$ 1,635	$ (1,635)	$ (22,372)	$ 649,131	$ 82,108	$ 1,012,270
Starting Balance, Redeemable Noncontrolling Interests at Oct. 31, 2015	91,282	91,282
Increase (Decrease) in Temporary Equity [Roll Forward]
Acquisition of noncontrolling interests		(3,599)
Ending Balance, Redeemable Noncontrolling Interests at Jul. 31, 2016	$ 87,906	$ 87,906