OPERATING SEGMENTS (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Segment Reporting Information [Line Items]
Revenues		$ 466,651	$ 468,146	$ 884,553	$ 974,421
Depreciation		6,779	6,765	13,534	13,565
Amortization		16,137	14,928	32,385	29,711
Operating Income (Loss)		96,748	108,161	177,033	219,151
Capital expenditures		6,429	5,585	21,938	12,435
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	(6,718)	(2,773)	(11,700)	(5,976)
Depreciation	[1]	240	256	486	511
Amortization	[1]	287	246	561	492
Operating Income (Loss)	[1]	(10,022)	(4,896)	(15,687)	(13,442)
Capital expenditures	[1]	17	0	17	5
Flight Support Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues		230,280	251,964	429,614	553,031
Depreciation		3,379	3,628	6,829	7,245
Amortization		4,971	4,752	10,107	9,611
Operating Income (Loss)		35,476	47,531	61,298	109,576
Capital expenditures		2,105	2,647	4,093	6,765
Electronic Technologies Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues		243,089	218,955	466,639	427,366
Depreciation		3,160	2,881	6,219	5,809
Amortization		10,879	9,930	21,717	19,608
Operating Income (Loss)		71,294	65,526	131,422	123,017
Capital expenditures		$ 4,307	$ 2,938	$ 17,828	$ 5,665

[1] Intersegment activity principally consists of net sales from the ETG to the FSG