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]
Starting Balance at Oct. 31, 2021			$ 543	$ 812	$ 320,747	$ 5,297	$ (5,297)	$ (8,552)	$ 1,949,521	$ 33,868	$ 2,296,939
Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 78,511							(8,410)	86,921
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	7,001	$ 4,141								2,860
Comprehensive income	85,512										81,371
Cash dividends									(12,227)		(12,227)
Issuance of common stock to Savings and Investment Plan					1,670						1,670
Share-based compensation expense					3,614						3,614
Proceeds from stock option exercises			3	3							769
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					763
Stock Redeemed or Called During Period, Value			(1)	(1)	(23,621)						(23,623)
Distributions to noncontrolling interests		(5,883)								(163)	(163)
Adjustments to redemption amount of redeemable noncontrolling interests		5,225							(5,225)		(5,225)
Adjustments to Additional Paid in Capital, Other					(1,069)						(1,069)
Ending Balance at Jan. 31, 2022			545	814	302,104	5,297	(5,297)	(16,962)	2,018,990	36,565	2,342,056
Starting Balance, Redeemable Noncontrolling Interests at Oct. 31, 2021		252,587
Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	7,001	4,141								2,860
Noncontrolling Interest, Increase from Business Combination	172
Distributions to noncontrolling interests		(5,883)								(163)	(163)
Adjustments to redemption amount of redeemable noncontrolling interests		5,225							(5,225)		(5,225)
Temporary Equity, Other Changes	2,047
Ending Balance, Redeemable Noncontrolling Interests at Jan. 31, 2022		258,289
Starting 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
Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	120,168							27,141	93,027
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	11,237	7,980								3,257
Comprehensive income	131,405										123,425
Cash dividends									(13,668)		(13,668)
Issuance of common stock to Savings and Investment Plan					1,964						1,964
Share-based compensation expense					2,812						2,812
Proceeds from stock option exercises			2	1							2,845
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					2,842
Stock Redeemed or Called During Period, Value					(14,805)						(14,805)
Distributions to noncontrolling interests		(10,901)								(390)	(390)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(1,059)			(1,674)						(1,674)
Adjustments to redemption amount of redeemable noncontrolling interests		4,616							(4,616)		(4,616)
Stock Issued During Period Value Deferred Compensation Obligation						874
Stock Held During Period Value Deferred Compensation Obligation							(874)
Adjustments to Additional Paid in Capital, Other					127						(25)
Stockholders' Equity, Other									(152)
Ending Balance at Jan. 31, 2023	2,744,174		$ 547	$ 822	388,603	$ 6,171	$ (6,171)	$ (19,358)	2,328,523	45,037	2,744,174
Starting Balance, Redeemable Noncontrolling Interests at Oct. 31, 2022	327,601	327,601
Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	11,237	7,980								3,257
Noncontrolling Interest, Increase from Business Combination	12,050
Distributions to noncontrolling interests		(10,901)								$ (390)	(390)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		1,059			$ 1,674						1,674
Adjustments to redemption amount of redeemable noncontrolling interests		4,616							$ (4,616)		$ (4,616)
Ending Balance, Redeemable Noncontrolling Interests at Jan. 31, 2023	$ 340,287	$ 340,287