OPERATING SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 430,602	$ 368,657	$ 835,012	$ 712,089
Depreciation	5,724	5,274	11,352	10,518
Amortization	13,341	9,979	26,737	19,983
Operating income	91,565	76,542	171,125	141,092
Capital expenditures	21,880	7,116	29,457	13,538
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(5,956)	(4,321)	(11,925)	(7,955)
Depreciation	124	53	186	106
Amortization	246	179	591	344
Operating income	(8,053)	(7,028)	(17,582)	(12,925)
Capital expenditures	15,729	98	19,266	144
Flight Support Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	267,836	231,809	522,557	452,710
Depreciation	3,290	3,128	6,582	6,276
Amortization	4,932	4,099	9,879	8,203
Operating income	51,488	44,744	97,357	86,107
Capital expenditures	3,909	4,688	6,206	8,560
Electronic Technologies Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	168,722	141,169	324,380	267,334
Depreciation	2,310	2,093	4,584	4,136
Amortization	8,163	5,701	16,267	11,436
Operating income	48,130	38,826	91,350	67,910
Capital expenditures	$ 2,242	$ 2,330	$ 3,985	$ 4,834