QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Net sales:
Net sales	$ 328,672	$ 300,370	$ 291,421	$ 268,185	$ 292,223	$ 291,030	$ 282,232	$ 266,826	$ 1,188,648	$ 1,132,311	$ 1,008,757
Gross profit:
Gross profit	126,796	108,092	105,494	93,797	102,946	103,327	99,922	92,117
Net income from consolidated operations:
Net income from consolidated operations	44,031	38,938	38,504	32,091	36,078	37,352	32,780	32,562	153,564	138,772	124,561
Net income attributable to HEICO:
Net income attributable to HEICO	$ 38,250	$ 34,369	$ 33,105	$ 27,640	$ 32,105	$ 33,366	$ 28,367	$ 27,455	$ 133,364	$ 121,293	$ 102,396
Basic:
Basic (in dollars per share)	$ 0.57	$ 0.51	$ 0.50	$ 0.42	$ 0.48	$ 0.50	$ 0.43	$ 0.41	$ 2.00	$ 1.82	$ 1.54
Diluted:
Diluted (in dollars per share)	$ 0.56	$ 0.51	$ 0.49	$ 0.41	$ 0.48	$ 0.49	$ 0.42	$ 0.41	$ 1.97	$ 1.80	$ 1.53