QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) (USD $)	3 Months Ended								12 Months Ended
	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2010	Jan. 31, 2010	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2009
Net sales:
Net sales	$ 208,919,000	$ 197,267,000	$ 184,486,000	$ 174,219,000	$ 169,370,000	$ 158,270,000	$ 153,845,000	$ 135,535,000	$ 764,891,000	$ 617,020,000	$ 538,296,000
Gross profit:
Gross profit	74,319,000	69,825,000	66,371,000	63,926,000	61,048,000	57,553,000	53,626,000	50,120,000
Net income from consolidated operations:
Net income from consolidated operations	24,412,000	26,392,000	22,126,000	22,523,000	19,891,000	19,526,000	16,908,000	16,030,000	95,453,000	72,355,000	59,845,000
Net income attributable to HEICO:
Net income attributable to HEICO	$ 18,514,000	$ 20,402,000	$ 16,830,000	$ 17,074,000	$ 15,642,000	$ 14,930,000	$ 12,573,000	$ 11,793,000	$ 72,820,000	$ 54,938,000	$ 44,626,000
Basic:
Basic (in dollars per share)	$ 0.44	$ 0.49	$ 0.40	$ 0.41	$ 0.38	$ 0.36	$ 0.31	$ 0.29	$ 1.75	$ 1.34	$ 1.09
Diluted:
Diluted (in dollars per share)	$ 0.44	$ 0.48	$ 0.40	$ 0.40	$ 0.37	$ 0.35	$ 0.30	$ 0.28	$ 1.71	$ 1.30	$ 1.06