OPERATING SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 465,825	$ 391,500	$ 1,300,837	$ 1,103,589
Depreciation	5,747	5,600	17,099	16,118
Amortization	13,687	10,811	40,424	30,794
Operating income	101,423	76,122	272,548	217,214
Capital expenditures	6,441	6,907	35,898	20,445
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(5,671)	(4,326)	(17,596)	(12,281)
Depreciation	253	54	439	160
Amortization	246	204	837	548
Operating income	(9,310)	(9,085)	(26,892)	(22,010)
Capital expenditures	0	76	19,266	220
Flight Support Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	285,126	257,966	807,683	710,676
Depreciation	3,237	3,378	9,819	9,654
Amortization	4,850	4,885	14,729	13,088
Operating income	54,712	46,664	152,069	132,771
Capital expenditures	3,504	3,745	9,710	12,305
Electronic Technologies Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	186,370	137,860	510,750	405,194
Depreciation	2,257	2,168	6,841	6,304
Amortization	8,591	5,722	24,858	17,158
Operating income	56,021	38,543	147,371	106,453
Capital expenditures	$ 2,937	$ 3,086	$ 6,922	$ 7,920