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, 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), attributable to HEICO	$ 409,915							6,319	403,596
Comprehensive income (loss), attributable to noncontrolling interest	41,488	$ 29,565								11,923
Comprehensive Income (Loss)	451,403										421,838
Cash dividends									(27,370)		(27,370)
Share-based Compensation Expense					15,475						15,475
Issuance of Common Stock to HEICO SIP					13,677						13,677
Proceeds from stock option exercises			2	3							6,713
Proceeds from stock option exercises, APIC					6,708
Issuance of common stock for an acquisition				11	161,362						161,373
Redemptions of common stock related to stock option exercises					(14,847)						(14,847)
Distributions to noncontrolling interests		(29,654)								(6,937)	(6,937)
Acquisitions of noncontrolling interests	2,700	1,059			1,674						1,674
Adjustments to redemption amount of redeemable noncontrolling interests		23,866							(23,866)		(23,866)
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					771
Stockholders' Equity, Other									(308)		463
Balances at Oct. 31, 2023			547	835	578,809	6,318	(6,318)	(40,180)	2,605,984	47,156	3,193,151
Redeemable noncontrolling interests at Oct. 31, 2022		327,601
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Redeemable Noncontrolling Interest	41,488	29,565								11,923
Distributions to noncontrolling interests		(29,654)								(6,937)	(6,937)
Noncontrolling interests assumed related to acquisition		12,137
Acquisitions of noncontrolling interests	(2,700)	(1,059)			(1,674)						(1,674)
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss), attributable to HEICO	528,213							14,104	514,109
Comprehensive income (loss), attributable to noncontrolling interest	45,462	31,134								14,328
Comprehensive Income (Loss)	573,675										542,541
Cash dividends									(29,069)		(29,069)
Share-based Compensation Expense					18,775						18,775
Issuance of Common Stock to HEICO SIP			1	1	15,994						15,996
Proceeds from stock option exercises			3	3							7,951
Proceeds from stock option exercises, APIC					7,945
Redemptions of common stock related to stock option exercises			(1)	(1)	(29,910)						(29,912)
Distributions to noncontrolling interests		(33,478)								(955)	(955)
Acquisitions of noncontrolling interests	26,600	26,567
Adjustments to redemption amount of redeemable noncontrolling interests		29,143							(29,143)		(29,143)
Value of Stock Issued During Period for Deferred Compensation Obligation						954
Value of Stock Held During Period in Irrevocable Trust for Deferred Compensation Obligation							(954)
Adjustments to Additional Paid in Capital, Other					7,786
Stockholders' Equity, Other									285		8,071
Balances at Oct. 31, 2024	3,697,406		550	838	599,399	7,272	(7,272)	(26,076)	3,062,166	60,529	3,697,406
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Redeemable Noncontrolling Interest	45,462	31,134								14,328
Distributions to noncontrolling interests		(33,478)								(955)	(955)
Noncontrolling interests assumed related to acquisition		8,783
Acquisitions of noncontrolling interests	(26,600)	(26,567)
Adjustments to redemption amount of redeemable noncontrolling interests		29,143							(29,143)		(29,143)
Temporary Equity, Other	(7,666)
Redeemable noncontrolling interests at Oct. 31, 2024	366,156	366,156
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss), attributable to HEICO	722,042							31,657	690,385
Comprehensive income (loss), attributable to noncontrolling interest	55,378	40,425								14,953
Comprehensive Income (Loss)	777,420										736,995
Cash dividends									(31,968)		(31,968)
Share-based Compensation Expense					34,381						34,381
Issuance of Common Stock to HEICO SIP			1	1	18,858						18,860
Proceeds from stock option exercises			1	2							13,212
Proceeds from stock option exercises, APIC					13,209
Issuance of common stock for an acquisition				1	10,122						10,123
Redemptions of common stock related to stock option exercises			(1)		(22,385)						(22,386)
Distributions to noncontrolling interests		(36,571)								(1,626)	(1,626)
Acquisitions of noncontrolling interests	5,800	5,773
Adjustments to redemption amount of redeemable noncontrolling interests		72,417							(72,417)		(72,417)
Value of Stock Issued During Period for Deferred Compensation Obligation						824
Value of Stock Held During Period in Irrevocable Trust for Deferred Compensation Obligation							(824)
Adjustments to Additional Paid in Capital, Other					(2,917)
Stockholders' Equity, Other									(488)		(3,405)
Balances at Oct. 31, 2025	4,379,175		$ 551	$ 842	$ 650,667	$ 8,096	$ (8,096)	$ 5,581	3,647,678	73,856	4,379,175
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Redeemable Noncontrolling Interest	55,378	40,425								14,953
Distributions to noncontrolling interests		(36,571)								$ (1,626)	(1,626)
Noncontrolling interests assumed related to acquisition		27,904
Acquisitions of noncontrolling interests	(5,800)	(5,773)
Adjustments to redemption amount of redeemable noncontrolling interests		72,417							$ (72,417)		$ (72,417)
Temporary Equity, Other	2,800
Redeemable noncontrolling interests at Oct. 31, 2025	$ 467,358	$ 467,358