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]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]	Total Shareholders Equity [Member]
Balances at Oct. 31, 2019			$ 541	$ 804	$ 284,609	$ 4,232	$ (4,232)	$ (16,739)	$ 1,397,327	$ 28,118	$ 1,694,660
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 321,574							7,590	313,984
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	22,218	$ 16,932								5,286
Comprehensive Income (Loss)	343,792										326,860
Cash dividends									(21,552)		(21,552)
Issuance of Common Stock to HEICO SIP			1		9,723						9,724
Share-based Compensation Expense					10,134						10,134
Proceeds from stock option exercises				6							6,955
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition					6,949
Stock Redeemed or Called During Period, Value				(1)	(12,119)						(12,120)
Distributions to noncontrolling interests	(16,176)									(1,732)	(1,732)
Adjustments to redemption amount of redeemable noncontrolling interests	1,714								(1,714)		(1,714)
Deferred Compensation Obligation						654
Stock Held During Period Value Deferred Compensation Obligation							(654)
Adjustments to Additional Paid in Capital, Other					634
Stockholders' Equity, Other										(1,242)	(608)
Balances at Oct. 31, 2020			542	809	299,930	4,886	(4,886)	(9,149)	1,688,045	30,430	2,010,607
Redeemable noncontrolling interests at Oct. 31, 2019		188,264
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Redeemable Noncontrolling Interest	22,218	16,932								5,286
Distributions to noncontrolling interests	(16,176)									(1,732)	(1,732)
Acquisitions of noncontrolling interests	(7,475)
Noncontrolling interests assumed related to acquisition		22,204
Adjustments to redemption amount of redeemable noncontrolling interests	1,714								(1,714)		(1,714)
Temporary Equity, Stock Issued During Period, Value, New Issues	14,329
Temporary Equity, Other	1,416
Redeemable noncontrolling interests at Oct. 31, 2020		221,208
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	304,817							597	304,220
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	25,476	19,662								5,814
Comprehensive Income (Loss)	330,293										310,631
Cash dividends									(23,002)		(23,002)
Issuance of Common Stock to HEICO SIP			1		9,791						9,792
Share-based Compensation Expense					9,058						9,058
Proceeds from stock option exercises				3							5,344
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition					5,341
Stock Redeemed or Called During Period, Value					(3,791)						(3,791)
Distributions to noncontrolling interests	(25,746)									(2,217)	(2,217)
Adjustments to redemption amount of redeemable noncontrolling interests	19,743								(19,743)		(19,743)
Deferred Compensation Obligation						411
Stock Held During Period Value Deferred Compensation Obligation							(411)
Adjustments to Additional Paid in Capital, Other					418
Stockholders' Equity, Other									1	(159)	260
Balances at Oct. 31, 2021	2,296,939		543	812	320,747	5,297	(5,297)	(8,552)	1,949,521	33,868	2,296,939
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Redeemable Noncontrolling Interest	25,476	19,662								5,814
Distributions to noncontrolling interests	(25,746)									(2,217)	(2,217)
Acquisitions of noncontrolling interests	(2,336)
Noncontrolling interests assumed related to acquisition		18,989
Adjustments to redemption amount of redeemable noncontrolling interests	19,743								(19,743)		(19,743)
Temporary Equity, Stock Issued During Period, Value, New Issues	1,067
Redeemable noncontrolling interests at Oct. 31, 2021	252,587	252,587
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	313,728							(37,947)	351,675
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	37,250	27,442								9,808
Comprehensive Income (Loss)	350,978										323,536
Cash dividends									(24,466)		(24,466)
Stock Issued During Period, Value, Acquisitions				6	74,999						75,005
Issuance of Common Stock to HEICO SIP				1	11,416						11,417
Share-based Compensation Expense					12,646						12,646
Proceeds from stock option exercises			3	3							2,352
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition					2,346
Stock Redeemed or Called During Period, Value			(1)	(1)	(25,944)						(25,946)
Distributions to noncontrolling interests		(23,607)								(1,485)	(1,485)
Increase to APIC from Purchase of Noncontrolling Interests and Net Assets					3,415						3,415
Adjustments to redemption amount of redeemable noncontrolling interests		22,798							(22,798)		(22,798)
Adjustments to Additional Paid in Capital, Other					(2,288)
Stockholders' Equity, Other										(21)	(2,309)
Balances at Oct. 31, 2022	2,648,306		$ 545	$ 821	$ 397,337	$ 5,297	$ (5,297)	$ (46,499)	2,253,932	42,170	2,648,306
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Redeemable Noncontrolling Interest	37,250	27,442								9,808
Distributions to noncontrolling interests		(23,607)								$ (1,485)	(1,485)
Acquisitions of noncontrolling interests	(8,700)	(12,150)
Noncontrolling interests assumed related to acquisition	56,770
Adjustments to redemption amount of redeemable noncontrolling interests		22,798							$ (22,798)		$ (22,798)
Temporary Equity, Other	3,761
Redeemable noncontrolling interests at Oct. 31, 2022	$ 327,601	$ 327,601