OPERATING SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 368,657	$ 350,648	$ 712,089	$ 656,875
Depreciation	5,274	5,154	10,518	10,012
Amortization	9,979	10,108	19,983	19,171
Operating income	76,542	66,794	141,092	119,415
Capital expenditures	7,116	9,856	13,538	15,546
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(4,321)	(2,208)	(7,955)	(4,709)
Depreciation	53	56	106	112
Amortization	179	166	344	331
Operating income	(7,028)	(7,916)	(12,925)	(13,044)
Capital expenditures	98	88	144	390
Flight Support Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	231,809	220,290	452,710	424,866
Depreciation	3,128	2,974	6,276	5,924
Amortization	4,099	4,117	8,203	8,245
Operating income	44,744	41,308	86,107	76,788
Capital expenditures	4,688	4,710	8,560	8,415
Electronic Technologies Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	141,169	132,566	267,334	236,718
Depreciation	2,093	2,124	4,136	3,976
Amortization	5,701	5,825	11,436	10,595
Operating income	38,826	33,402	67,910	55,671
Capital expenditures	$ 2,330	$ 5,058	$ 4,834	$ 6,741