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]
Beginning Balance at Oct. 31, 2022			$ 545	$ 821	$ 397,337	$ 5,297	$ (5,297)	$ (46,499)	$ 2,253,932	$ 42,170	$ 2,648,306
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 227,020							28,873	198,147
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	21,452	$ 15,356								6,096
Comprehensive income	248,472										233,116
Cash dividends									(13,668)		(13,668)
Issuance of common stock to Savings and Investment Plan					7,760						7,760
Share-based compensation expense					6,055						6,055
Proceeds from stock option exercises			2	2							4,074
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					4,070
Stock Redeemed or Called During Period, Value					(14,811)						(14,811)
Distributions to noncontrolling interests		(16,161)								(6,489)	(6,489)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(1,059)			(1,674)						(1,674)
Adjustments to redemption amount of redeemable noncontrolling interests		3,103							(3,103)		(3,103)
Value of Stock Issued During Period for Deferred Compensation Obligation						874
Value of Stock Held During Period in Irrevocable Trust for Deferred Compensation Obligation							(874)
Adjustments to Additional Paid in Capital, Other	254
Stockholders' Equity, Other									(153)		101
Ending Balance at Apr. 30, 2023			547	823	398,991	6,171	(6,171)	(17,626)	2,435,155	41,777	2,859,667
Starting Balance, Redeemable Noncontrolling Interests at Oct. 31, 2022		327,601
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	21,452	15,356								6,096
Noncontrolling Interest, Increase from Business Combination	14,642
Distributions to noncontrolling interests		(16,161)								(6,489)	(6,489)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(1,059)			(1,674)						(1,674)
Adjustments to redemption amount of redeemable noncontrolling interests		3,103							(3,103)		(3,103)
Temporary Equity, Other Changes	2,351
Ending Balance, Redeemable Noncontrolling Interests at Apr. 30, 2023		345,833
Beginning Balance at Jan. 31, 2023			547	822	388,603	6,171	(6,171)	(19,358)	2,328,523	45,037	2,744,174
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	106,852							1,732	105,120
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	10,215	7,376								2,839
Comprehensive income	117,067										109,691
Issuance of common stock to Savings and Investment Plan					5,796						5,796
Share-based compensation expense					3,243						3,243
Proceeds from stock option exercises				1							1,229
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					1,228
Stock Redeemed or Called During Period, Value					(6)						(6)
Distributions to noncontrolling interests		(5,260)								(6,099)	(6,099)
Adjustments to redemption amount of redeemable noncontrolling interests		(1,513)							1,513		1,513
Adjustments to Additional Paid in Capital, Other	127
Stockholders' Equity, Other									(1)		126
Ending Balance at Apr. 30, 2023			547	823	398,991	6,171	(6,171)	(17,626)	2,435,155	41,777	2,859,667
Starting Balance, Redeemable Noncontrolling Interests at Jan. 31, 2023		340,287
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	10,215	7,376								2,839
Noncontrolling Interest, Increase from Business Combination	2,592
Distributions to noncontrolling interests		(5,260)								(6,099)	(6,099)
Adjustments to redemption amount of redeemable noncontrolling interests		(1,513)							1,513		1,513
Temporary Equity, Other Changes	2,351
Ending Balance, Redeemable Noncontrolling Interests at Apr. 30, 2023		345,833
Beginning Balance 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 Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	242,347							4,503	237,844
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	22,680	15,999								6,681
Comprehensive income	265,027										249,028
Cash dividends									(13,831)		(13,831)
Issuance of common stock to Savings and Investment Plan					9,300						9,300
Share-based compensation expense					9,463						9,463
Proceeds from stock option exercises			1	1							4,151
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					4,149
Stock Redeemed or Called During Period, Value					(2,352)						(2,352)
Distributions to noncontrolling interests		(14,967)								(458)	(458)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(3,165)
Adjustments to redemption amount of redeemable noncontrolling interests		4,608							(4,608)		(4,608)
Adjustments to Additional Paid in Capital, Other					(670)
Stockholders' Equity, Other									(368)		(1,038)
Ending Balance at Apr. 30, 2024	3,442,806		548	836	598,699	6,318	(6,318)	(35,677)	2,825,021	53,379	3,442,806
Starting Balance, 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	22,680	15,999								6,681
Distributions to noncontrolling interests		(14,967)								(458)	(458)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(3,165)
Adjustments to redemption amount of redeemable noncontrolling interests		4,608							(4,608)		(4,608)
Temporary Equity, Other Changes	1,087
Ending Balance, Redeemable Noncontrolling Interests at Apr. 30, 2024	368,369	368,369
Beginning Balance at Jan. 31, 2024			548	836	585,888	6,318	(6,318)	(25,962)	2,705,128	50,201	3,316,639
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	113,431							(9,715)	123,146
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	11,340	8,003								3,337
Comprehensive income	124,771										116,768
Issuance of common stock to Savings and Investment Plan					6,724						6,724
Share-based compensation expense					4,582						4,582
Proceeds from stock option exercises											1,897
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					1,897
Stock Redeemed or Called During Period, Value					(1,751)						(1,751)
Distributions to noncontrolling interests		(6,500)								(159)	(159)
Increase to APIC from Purchase of Noncontrolling Interests and Net Assets					1,156						1,156
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(2,109)
Adjustments to redemption amount of redeemable noncontrolling interests		3,165							(3,165)		(3,165)
Adjustments to Additional Paid in Capital, Other					203
Stockholders' Equity, Other									(88)		115
Ending Balance at Apr. 30, 2024	3,442,806		$ 548	$ 836	$ 598,699	$ 6,318	$ (6,318)	$ (35,677)	2,825,021	53,379	3,442,806
Starting Balance, Redeemable Noncontrolling Interests at Jan. 31, 2024		365,865
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	11,340	8,003								3,337
Distributions to noncontrolling interests		(6,500)								$ (159)	(159)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(2,109)
Adjustments to redemption amount of redeemable noncontrolling interests		3,165							$ (3,165)		$ (3,165)
Temporary Equity, Other Changes	(55)
Ending Balance, Redeemable Noncontrolling Interests at Apr. 30, 2024	$ 368,369	$ 368,369