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, 2023			$ 547	$ 835	$ 578,809	$ 6,318	$ (6,318)	$ (40,180)	$ 2,605,984	$ 47,156	$ 3,193,151
Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 128,916							14,218	114,698
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	11,340	$ 7,996								3,344
Comprehensive income	140,256										132,260
Cash dividends									(13,831)		(13,831)
Issuance of common stock to Savings and Investment Plan					2,576						2,576
Share-based compensation expense					4,881						4,881
Proceeds from stock option exercises			1	1							2,254
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					2,252
Stock Redeemed or Called During Period, Value					(601)						(601)
Distributions to noncontrolling interests		(8,467)								(299)	(299)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(1,056)			(1,156)						(1,156)
Adjustments to redemption amount of redeemable noncontrolling interests		1,443							(1,443)		(1,443)
Adjustments to Additional Paid in Capital, Other					(873)
Stockholders' Equity, Other									(280)		(1,153)
Ending Balance at Jan. 31, 2024			548	836	585,888	6,318	(6,318)	(25,962)	2,705,128	50,201	3,316,639
Starting Balance, Redeemable Noncontrolling Interests at Oct. 31, 2023		364,807
Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	11,340	7,996								3,344
Distributions to noncontrolling interests		(8,467)								(299)	(299)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		1,056			1,156						1,156
Adjustments to redemption amount of redeemable noncontrolling interests		1,443							(1,443)		(1,443)
Temporary Equity, Other Changes	1,142
Ending Balance, Redeemable Noncontrolling Interests at Jan. 31, 2024		365,865
Starting Balance 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
Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	140,445							(27,510)	167,955
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	12,308	7,573								4,735
Comprehensive income	152,753										145,180
Cash dividends									(15,272)		(15,272)
Stock Issued During Period, Value, Acquisitions				1	10,122						10,123
Issuance of common stock to Savings and Investment Plan					2,679						2,679
Share-based compensation expense					4,671						4,671
Proceeds from stock option exercises											1,597
Proceeds from stock option exercises, Adjustment to Additional Paid in Capital					1,597
Stock Redeemed or Called During Period, Value					(95)						(95)
Distributions to noncontrolling interests		(8,886)								(1,063)	(1,063)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(3,258)
Adjustments to redemption amount of redeemable noncontrolling interests		34,586							(34,586)		(34,586)
Adjustments to Additional Paid in Capital, Other					249						88
Stockholders' Equity, Other									(161)
Ending Balance at Jan. 31, 2025	3,810,728		$ 550	$ 839	$ 618,622	$ 7,272	$ (7,272)	$ (53,586)	3,180,102	64,201	3,810,728
Starting Balance, Redeemable Noncontrolling Interests at Oct. 31, 2024	366,156	366,156
Temporary Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	12,308	7,573								4,735
Noncontrolling Interest, Increase from Business Combination	27,912
Distributions to noncontrolling interests		(8,886)								$ (1,063)	(1,063)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		3,258
Adjustments to redemption amount of redeemable noncontrolling interests		34,586							$ (34,586)		$ (34,586)
Ending Balance, Redeemable Noncontrolling Interests at Jan. 31, 2025	$ 424,083	$ 424,083