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REVENUE (Disaggregation of Revenue, by Product Line) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer $ 515,648 $ 430,602 $ 981,794 $ 835,012
Flight Support Group [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 308,251 267,836 595,464 522,557
Flight Support Group [Member] | Aftermarket Replacement Parts [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer [1] 167,225 139,567 326,722 273,855
Flight Support Group [Member] | Repair and Overhaul Parts and Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer [2] 73,454 71,756 140,617 140,080
Flight Support Group [Member] | Specialty Products [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer [3] 67,572 56,513 128,125 108,622
Electronic Technologies Group [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 214,451 168,722 398,880 324,380
Electronic Technologies Group [Member] | Electronic Components for Defense, Space and Aerospace [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer [4] 161,664 130,891 299,414 248,232
Electronic Technologies Group [Member] | Other Electronic Components [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer [5] 52,787 37,831 99,466 76,148
Corporate And Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer $ (7,054) $ (5,956) $ (12,550) $ (11,925)
[1]
(1) 
Includes various jet engine and aircraft component replacement parts.
[2]
(2) 
Includes primarily the sale of parts consumed in various repair and overhaul services on selected jet engine and aircraft components, avionics, instruments, composites and flight surfaces of commercial and military aircraft.
[3]
(3) 
Includes primarily the sale of specialty components such as thermal insulation blankets, renewable/reusable insulation systems, advanced niche components, complex composite assemblies, and expanded foil mesh.
[4]
(4) 
Includes various component parts such as electro-optical infrared simulation and test equipment, electro-optical laser products, electro-optical, microwave and other power equipment, high-speed interface products, power conversion products, underwater locator beacons, emergency locator transmission beacons, traveling wave tube amplifiers, microwave power modules, three-dimensional microelectronic and stacked memory products, crashworthy and ballistically self-sealing auxiliary fuel systems, radio frequency (RF) and microwave amplifiers, transmitters and receivers, high performance communications and electronic intercept receivers and tuners and high performance active antenna systems.
[5]
(5) 
Includes various component parts such as electromagnetic and radio interference shielding, high voltage interconnection devices, high voltage advanced power electronics, harsh environment connectivity products, custom molded cable assemblies and silicone material for a variety of demanding applications.