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, 2015			$ 269	$ 400	$ 286,220	$ 1,783	$ (1,783)	$ (25,080)	$ 548,054	$ 83,408	$ 893,271
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	$ 33,257	$ 1,972						(2,463)	31,271	2,477	31,285
Cash dividends									(5,350)		(5,350)
Issuance of common stock to Savings and Investment Plan					945						945
Share-based compensation expense					1,680						1,680
Proceeds from stock option exercises					94						94
Tax benefit from stock option exercises					871						871
Distributions to noncontrolling interests		(1,860)								(836)	(836)
Adjustments to redemption amount of redeemable noncontrolling interests		(258)							258		258
Stock Held During Period Value Deferred Compensation Obligation						(148)
Stock Issued During Period Value Deferred Compensation Obligation							148
Ending Balance at Jan. 31, 2016			269	400	289,810	1,635	(1,635)	(27,543)	574,233	85,049	922,218
Starting Balance, Redeemable Noncontrolling Interests at Oct. 31, 2015		91,282
Ending Balance, Redeemable Noncontrolling Interests at Jan. 31, 2016		91,136
Starting Balance at Oct. 31, 2016	1,047,705		270	403	306,328	2,460	(2,460)	(25,326)	681,704	84,326	1,047,705
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	44,748	2,294						(1,221)	40,927	2,748	42,454
Cash dividends									(6,059)		(6,059)
Issuance of common stock to Savings and Investment Plan					893						893
Share-based compensation expense					1,451						1,451
Proceeds from stock option exercises				1	1,229						1,230
Distributions to noncontrolling interests		(1,712)								(274)	(274)
Adjustments to redemption amount of redeemable noncontrolling interests		(1,192)							1,192		1,192
Stock Held During Period Value Deferred Compensation Obligation						(140)
Stock Issued During Period Value Deferred Compensation Obligation							140
Ending Balance at Jan. 31, 2017	1,088,592		$ 270	$ 404	$ 309,901	$ 2,320	$ (2,320)	$ (26,547)	$ 717,764	$ 86,800	$ 1,088,592
Starting Balance, Redeemable Noncontrolling Interests at Oct. 31, 2016	99,512	99,512
Ending Balance, Redeemable Noncontrolling Interests at Jan. 31, 2017	$ 98,902	$ 98,902