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ACQUISITIONS (Details) - Acquisition of CornellCookson, Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 04, 2018 | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 439,395 |  | $ 319,139 | $ 306,163
Cornell Cookson [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable |  | $ 30,400 |  |
Inventories |  | 12,336 |  |
Property, plant and equipment |  | 49,426 |  |
Goodwill |  | 42,883 |  |
Intangible assets |  | 67,600 |  |
Other current and non-current assets |  | 2,648 |  |
Total assets acquired |  | 205,293 |  |
Accounts payable and accrued liabilities |  | 12,207 |  |
Long-term liabilities |  | 660 |  |
Total liabilities assumed |  | 12,867 |  |
Total |  | 192,426 |  |
Receivables gross |  | 30,818 |  |
Allowance for accounts receivable |  | 418 |  |
Inventory, gross |  | 13,433 |  |
Inventory valuation reserves |  | $ 1,098 |  |

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