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, 2021			$ 543	$ 812	$ 320,747	$ 5,297	$ (5,297)	$ (8,552)	$ 1,949,521	$ 33,868	$ 2,296,939
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 225,096							(29,375)	254,471
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	24,631	$ 17,639								6,992
Comprehensive income	249,727										232,088
Cash dividends									(24,466)		(24,466)
Issuance of common stock to Savings and Investment Plan				1	9,497						9,498
Share-based compensation expense					9,815						9,815
Proceeds from stock option exercises			3	3							1,870
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					1,864
Stock Redeemed or Called During Period, Value			(1)	(1)	(25,824)						(25,826)
Distributions to noncontrolling interests		(15,759)								(1,007)	(1,007)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(12,150)
Increase to APIC from Purchase of Noncontrolling Interests and Net Assets					3,415						3,415
Adjustments to redemption amount of redeemable noncontrolling interests		8,194							(8,194)		(8,194)
Adjustments to Additional Paid in Capital, Other					(2,149)
Stockholders' Equity, Other									1		(2,148)
Ending Balance at Jul. 31, 2022			545	815	317,365	5,297	(5,297)	(37,927)	2,171,333	39,853	2,491,984
Starting Balance, 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	24,631	17,639								6,992
Noncontrolling Interest, Increase from Business Combination	42,719
Distributions to noncontrolling interests		(15,759)								(1,007)	(1,007)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(12,150)
Adjustments to redemption amount of redeemable noncontrolling interests		8,194							(8,194)		(8,194)
Temporary Equity, Other Changes	3,764
Ending Balance, Redeemable Noncontrolling Interests at Jul. 31, 2022		296,994
Beginning Balance at Apr. 30, 2022			545	814	311,053	5,297	(5,297)	(30,554)	2,100,178	38,438	2,420,474
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	75,167							(7,373)	82,540
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	10,191	8,377								1,814
Comprehensive income	85,358										76,981
Cash dividends									(12,239)		(12,239)
Issuance of common stock to Savings and Investment Plan				1	1,758						1,759
Share-based compensation expense					2,960						2,960
Proceeds from stock option exercises											260
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					260
Stock Redeemed or Called During Period, Value					(2,134)						(2,134)
Distributions to noncontrolling interests		(5,791)								(399)	(399)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(12,150)
Increase to APIC from Purchase of Noncontrolling Interests and Net Assets					3,415						3,415
Adjustments to redemption amount of redeemable noncontrolling interests		(853)							853		853
Adjustments to Additional Paid in Capital, Other					53
Stockholders' Equity, Other									1		54
Ending Balance at Jul. 31, 2022			545	815	317,365	5,297	(5,297)	(37,927)	2,171,333	39,853	2,491,984
Starting Balance, Redeemable Noncontrolling Interests at Apr. 30, 2022		303,927
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	10,191	8,377								1,814
Noncontrolling Interest, Increase from Business Combination	3,484
Distributions to noncontrolling interests		(5,791)								(399)	(399)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(12,150)
Adjustments to redemption amount of redeemable noncontrolling interests		(853)							853		853
Ending Balance, Redeemable Noncontrolling Interests at Jul. 31, 2022		296,994
Beginning Balance 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 Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	330,012							29,842	300,170
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	32,113	22,745								9,368
Comprehensive income	362,125										339,380
Cash dividends									(27,370)		(27,370)
Issuance of common stock to Savings and Investment Plan					9,222						9,222
Share-based compensation expense					10,412						10,412
Proceeds from stock option exercises			2	2							5,484
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					5,480
Stock Redeemed or Called During Period, Value					(14,847)						(14,847)
Distributions to noncontrolling interests		(23,226)								(6,708)	(6,708)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(1,059)			(1,674)						(1,674)
Adjustments to redemption amount of redeemable noncontrolling interests		3,334							(3,334)		(3,334)
Value of Stock Issued During Period for Deferred Compensation Obligation						1,021
Value of Stock Held During Period in Irrevocable Trust for Deferred Compensation Obligation							(1,021)
Adjustments to Additional Paid in Capital, Other					512
Stockholders' Equity, Other									(186)	(1)	325
Ending Balance at Jul. 31, 2023	2,959,196		547	823	406,442	6,318	(6,318)	(16,657)	2,523,212	44,829	2,959,196
Starting Balance, 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	32,113	22,745								9,368
Noncontrolling Interest, Increase from Business Combination	12,137
Distributions to noncontrolling interests		(23,226)								(6,708)	(6,708)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(1,059)			(1,674)						(1,674)
Adjustments to redemption amount of redeemable noncontrolling interests		3,334							(3,334)		(3,334)
Temporary Equity, Other Changes	2,351
Ending Balance, Redeemable Noncontrolling Interests at Jul. 31, 2023	343,883	343,883
Beginning Balance at Apr. 30, 2023			547	823	398,991	6,171	(6,171)	(17,626)	2,435,155	41,777	2,859,667
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	102,992							969	102,023
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	10,661	7,389								3,272
Comprehensive income	113,653										106,264
Cash dividends									(13,702)		(13,702)
Issuance of common stock to Savings and Investment Plan					1,462						1,462
Share-based compensation expense					4,357						4,357
Proceeds from stock option exercises											1,410
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					1,410
Stock Redeemed or Called During Period, Value					(36)						(36)
Distributions to noncontrolling interests		(7,065)								(219)	(219)
Adjustments to redemption amount of redeemable noncontrolling interests		231							(231)		(231)
Value of Stock Issued During Period for Deferred Compensation Obligation						147
Value of Stock Held During Period in Irrevocable Trust for Deferred Compensation Obligation							(147)
Adjustments to Additional Paid in Capital, Other					258
Stockholders' Equity, Other									(33)	(1)	224
Ending Balance at Jul. 31, 2023	2,959,196		$ 547	$ 823	$ 406,442	$ 6,318	$ (6,318)	$ (16,657)	2,523,212	44,829	2,959,196
Starting Balance, Redeemable Noncontrolling Interests at Apr. 30, 2023		345,833
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	10,661	7,389								3,272
Distributions to noncontrolling interests		(7,065)								$ (219)	(219)
NoncontrollingInterestDecreaseFromBusinessAcquisition	(2,505)
Adjustments to redemption amount of redeemable noncontrolling interests		231							$ (231)		$ (231)
Ending Balance, Redeemable Noncontrolling Interests at Jul. 31, 2023	$ 343,883	$ 343,883