OPERATING SEGMENTS (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Segment Reporting Information [Line Items]
Revenues		$ 538,813	$ 466,651	$ 1,029,156	$ 884,553
Depreciation		7,366	6,779	14,696	13,534
Amortization		16,119	16,137	32,011	32,385
Operating Income (Loss)		122,777	96,748	221,599	177,033
Capital expenditures		7,520	6,429	16,211	21,938
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	(4,893)	(6,718)	(9,567)	(11,700)
Depreciation	[1]	247	240	493	486
Amortization	[1]	283	287	570	561
Operating Income (Loss)	[1]	(9,408)	(10,022)	(18,550)	(15,687)
Capital expenditures	[1]	64	17	103	17
Flight Support Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues		306,313	230,280	578,994	429,614
Depreciation		3,693	3,379	7,411	6,829
Amortization		5,749	4,971	11,262	10,107
Operating Income (Loss)		66,197	35,476	118,573	61,298
Capital expenditures		4,531	2,105	8,113	4,093
Electronic Technologies Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues		237,393	243,089	459,729	466,639
Depreciation		3,426	3,160	6,792	6,219
Amortization		10,087	10,879	20,179	21,717
Operating Income (Loss)		65,988	71,294	121,576	131,422
Capital expenditures		$ 2,925	$ 4,307	$ 7,995	$ 17,828

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