OPERATING SEGMENTS (Total assets) (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Oct. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 3,547,711	$ 2,969,211
Operating Segments [Member] | Flight Support Group [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,127,666	1,149,737
Operating Segments [Member] | Electronic Technologies Group [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,896,671	1,643,032
Corporate And Eliminations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 523,374	$ 176,442