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	$ 149,929							(22,002)	171,931
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	14,440	$ 9,262								5,178
Comprehensive income	164,369										155,107
Cash dividends									(12,227)		(12,227)
Issuance of common stock to Savings and Investment Plan					7,739						7,739
Share-based compensation expense					6,855						6,855
Proceeds from stock option exercises			3	3							1,610
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					1,604
Stock Redeemed or Called During Period, Value			(1)	(1)	(23,690)						(23,692)
Distributions to noncontrolling interests		(9,968)								(608)	(608)
Adjustments to redemption amount of redeemable noncontrolling interests		9,047							(9,047)		(9,047)
Adjustments to Additional Paid in Capital, Other					(2,202)						(2,202)
Ending Balance at Apr. 30, 2022			545	814	311,053	5,297	(5,297)	(30,554)	2,100,178	38,438	2,420,474
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	14,440	9,262								5,178
Noncontrolling Interest, Increase from Business Combination	39,235
Distributions to noncontrolling interests		(9,968)								(608)	(608)
Adjustments to redemption amount of redeemable noncontrolling interests		9,047							(9,047)		(9,047)
Temporary Equity, Other Changes	3,764
Ending Balance, Redeemable Noncontrolling Interests at Apr. 30, 2022		303,927
Beginning Balance at Jan. 31, 2022			545	814	302,104	5,297	(5,297)	(16,962)	2,018,990	36,565	2,342,056
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	71,418							(13,592)	85,010
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	7,439	5,121								2,318
Comprehensive income	78,857										73,736
Issuance of common stock to Savings and Investment Plan					6,069						6,069
Share-based compensation expense					3,241						3,241
Proceeds from stock option exercises											841
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					841
Stock Redeemed or Called During Period, Value					(69)						(69)
Distributions to noncontrolling interests		(4,085)								(445)	(445)
Adjustments to redemption amount of redeemable noncontrolling interests		3,822							(3,822)		(3,822)
Adjustments to Additional Paid in Capital, Other					(1,133)						(1,133)
Ending Balance at Apr. 30, 2022			545	814	311,053	5,297	(5,297)	(30,554)	2,100,178	38,438	2,420,474
Starting Balance, Redeemable Noncontrolling Interests at Jan. 31, 2022		258,289
Increase (Decrease) in Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	7,439	5,121								2,318
Noncontrolling Interest, Increase from Business Combination	39,063
Distributions to noncontrolling interests		(4,085)								(445)	(445)
Adjustments to redemption amount of redeemable noncontrolling interests		3,822							(3,822)		(3,822)
Temporary Equity, Other Changes	1,717
Ending Balance, Redeemable Noncontrolling Interests at Apr. 30, 2022		303,927
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	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	2,859,667		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	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	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	2,859,667		$ 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	$ 345,833