ACQUISITIONS ACQUISITIONS (Total Consideration) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Business Acquisition [Line Items]
Cash paid, net	$ 240,841	$ 59,775	$ 418,265
HEICO Electronic [Member] | AAT [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	317,500
Cash Acquired from Acquisition	(868)
Cash paid, net	316,632
Contingent purchase consideration	13,797
Additional purchase consideration	544
Total purchase consideration	$ 330,973