OPERATING SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items]
Net sales	$ 363,299	$ 356,084	$ 350,648	$ 306,227	$ 328,672	$ 300,370	$ 291,421	$ 268,185	$ 1,376,258	$ 1,188,648	$ 1,132,311
Depreciation									20,361	17,830	17,068
Amortization									39,916	30,077	30,689
Depreciation and amortization									60,277	47,907	47,757
Operating income									265,345	229,656	203,388
Capital expenditures									30,863	18,249	16,410
Total assets	2,039,475				1,736,387				2,039,475	1,736,387	1,489,214
Flight Support Group [Member]
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items]
Net sales									875,870	809,700	762,801
Depreciation									12,113	10,859	9,809
Amortization									16,590	13,470	10,034
Operating income									163,427	149,798	136,480
Capital expenditures									18,434	11,737	9,437
Total assets	878,674				868,218				878,674	868,218	676,824
Electronic Technologies Group [Member]
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items]
Net sales									511,272	390,982	379,404
Depreciation									8,030	6,803	7,113
Amortization									22,664	15,945	19,993
Operating income									126,031	98,833	88,914
Capital expenditures									11,962	6,201	6,327
Total assets	1,017,827				746,018				1,017,827	746,018	703,144
Other Primarily Corporate and Inter Segment [Member]
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items]
Depreciation									218	168	146
Amortization									662	662	662
Operating income									(24,113)	(18,975)	(22,006)
Capital expenditures									467	311	646
Total assets	$ 142,974				$ 122,151				142,974	122,151	109,246
Consolidation, Eliminations [Member] | Other Primarily Corporate and Inter Segment [Member]
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items]
Net sales									$ (10,884)	$ (12,034)	$ (9,894)