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, 2020			$ 542	$ 809	$ 299,930	$ 4,886	$ (4,886)	$ (9,149)	$ 1,688,045	$ 30,430	$ 2,010,607
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 304,817							597	304,220
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)
Value of Stock Held During Period in Irrevocable Trust for Deferred Compensation Obligation							(411)
Value of Stock Issued During Period for Deferred Compensation Obligation						411
Adjustments to Additional Paid in Capital, Other					418
Stockholders' Equity, Other									1	(159)	260
Balances at Oct. 31, 2021			543	812	320,747	5,297	(5,297)	(8,552)	1,949,521	33,868	2,296,939
Redeemable noncontrolling interests at Oct. 31, 2020		221,208
Increase (Decrease) in Temporary Equity [Roll Forward]
Distributions to noncontrolling interests		(25,746)								(2,217)	(2,217)
Acquisitions of noncontrolling interests	(2,300)	(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
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	25,476	19,662								5,814
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	313,728							(37,947)	351,675
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]
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
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	37,250	27,442								9,808
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	409,915							6,319	403,596
Comprehensive Income (Loss)	451,403										421,838
Cash dividends									(27,370)		(27,370)
Stock Issued During Period, Value, Acquisitions				11	161,362						161,373
Issuance of Common Stock to HEICO SIP					13,677						13,677
Share-based Compensation Expense					15,475						15,475
Proceeds from stock option exercises			2	3							6,713
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition					6,708
Stock Redeemed or Called During Period, Value					(14,847)						(14,847)
Distributions to noncontrolling interests		(29,654)								(6,937)	(6,937)
Adjustments to redemption amount of redeemable noncontrolling interests		23,866							(23,866)		(23,866)
Value of Stock Held During Period in Irrevocable Trust for Deferred Compensation Obligation							(1,021)
Value of Stock Issued During Period for Deferred Compensation Obligation						1,021
Adjustments to Additional Paid in Capital, Other					771
Stockholders' Equity, Other									(308)		463
Balances at Oct. 31, 2023	3,193,151		$ 547	$ 835	578,809	$ 6,318	$ (6,318)	$ (40,180)	2,605,984	47,156	3,193,151
Increase (Decrease) in Temporary Equity [Roll Forward]
Distributions to noncontrolling interests		(29,654)								(6,937)	(6,937)
Acquisitions of noncontrolling interests	(2,700)	(1,059)			$ (1,674)						(1,674)
Noncontrolling interests assumed related to acquisition	12,137
Adjustments to redemption amount of redeemable noncontrolling interests		23,866							$ (23,866)		$ (23,866)
Temporary Equity, Other	2,351
Redeemable noncontrolling interests at Oct. 31, 2023	364,807	364,807
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	$ 41,488	$ 29,565								$ 11,923