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OPERATING SEGMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 476,884 | $ 465,825 | $ 430,602 | $ 404,410 | $ 421,224 | $ 391,500 | $ 368,657 | $ 343,432 | $ 1,777,721 | $ 1,524,813 | $ 1,376,258
Depreciation |  |  |  |  |  |  |  |  | 23,239 | 21,878 | 20,361
Amortization |  |  |  |  |  |  |  |  | 53,952 | 42,945 | 39,916
Operating income |  |  |  |  |  |  |  |  | 376,245 | 306,658 | 265,345
Capital expenditures |  |  |  |  |  |  |  |  | 41,871 | 25,998 | 30,863
Total assets | 2,653,396 |  |  |  | 2,512,431 |  |  |  | 2,653,396 | 2,512,431 | 1,998,412
Flight Support Group [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,097,937 | 967,540 | 875,870
Depreciation |  |  |  |  |  |  |  |  | 13,322 | 13,042 | 12,113
Amortization |  |  |  |  |  |  |  |  | 19,530 | 18,026 | 16,590
Operating income |  |  |  |  |  |  |  |  | 206,623 | 179,278 | 163,427
Capital expenditures |  |  |  |  |  |  |  |  | 13,074 | 15,665 | 18,434
Total assets | 1,093,858 |  |  |  | 1,042,925 |  |  |  | 1,093,858 | 1,042,925 | 877,672
Electronic Technologies Group [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item For Operating Profit (Loss) and Capital Expenditure From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 701,827 | 574,261 | 511,272
Depreciation |  |  |  |  |  |  |  |  | 9,225 | 8,609 | 8,030
Amortization |  |  |  |  |  |  |  |  | 33,339 | 24,167 | 22,664
Operating income |  |  |  |  |  |  |  |  | 204,508 | 157,451 | 126,031
Capital expenditures |  |  |  |  |  |  |  |  | 9,531 | 10,100 | 11,962
Total assets | 1,391,997 |  |  |  | 1,339,363 |  |  |  | 1,391,997 | 1,339,363 | 1,015,696
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 |  |  |  |  |  |  |  |  | 692 | 227 | 218
Amortization |  |  |  |  |  |  |  |  | 1,083 | 752 | 662
Operating income |  |  |  |  |  |  |  |  | (34,886) | (30,071) | (24,113)
Capital expenditures |  |  |  |  |  |  |  |  | 19,266 | 233 | 467
Total assets | $ 167,541 |  |  |  | $ 130,143 |  |  |  | 167,541 | 130,143 | 105,044
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 |  |  |  |  |  |  |  |  | $ (22,043) | $ (16,988) | $ (10,884)

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