OPERATING SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 391,500	$ 356,084	$ 1,103,589	$ 1,012,959
Depreciation	5,600	4,981	16,118	14,993
Amortization	10,811	10,439	30,794	29,610
Operating income	76,122	69,854	217,214	189,269
Capital expenditures	6,907	7,567	20,445	23,113
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(4,326)	(2,684)	(12,281)	(7,393)
Depreciation	54	54	160	166
Amortization	204	165	548	496
Operating income	(9,085)	(5,724)	(22,010)	(18,768)
Capital expenditures	76	17	220	407
Flight Support Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	257,966	222,553	710,676	647,419
Depreciation	3,378	3,049	9,654	8,973
Amortization	4,885	4,169	13,088	12,414
Operating income	46,664	41,969	132,771	118,757
Capital expenditures	3,745	5,034	12,305	13,449
Electronic Technologies Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	137,860	136,215	405,194	372,933
Depreciation	2,168	1,878	6,304	5,854
Amortization	5,722	6,105	17,158	16,700
Operating income	38,543	33,609	106,453	89,280
Capital expenditures	$ 3,086	$ 2,516	$ 7,920	$ 9,257