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ACQUISITIONS (Details) - Acquisition of CornellCookson, Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 04, 2018 | Sep. 30, 2017
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 437,067 | $ 439,395 |  | $ 319,139
Cornell Cookson [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable |  |  | $ 30,400 |
Inventories |  |  | 12,336 |
Property, plant and equipment |  |  | 49,426 |
Goodwill |  |  | 43,183 |
Intangible assets |  |  | 67,600 |
Other current and non-current assets |  |  | 2,648 |
Total assets acquired |  |  | 205,593 |
Accounts payable and accrued liabilities |  |  | 12,507 |
Long-term liabilities |  |  | 660 |
Total liabilities assumed |  |  | 13,167 |
Total |  |  | 192,426 |
Receivables gross |  |  | 30,818 |
Allowance for accounts receivable |  |  | 418 |
Inventory, gross |  |  | 13,434 |
Inventory valuation reserves |  |  | $ 1,098 |

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