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ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | May 21, 2014 | Dec. 31, 2013
ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications [Line Items] |  |  |  |  |
Goodwill | $ 361,185 | $ 356,241 | $ 374,111 |  |
Customer relationships [Member] |  |  |  |  |
ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications [Line Items] |  |  |  |  |
Amortization Period (Years) | 25 years |  |  |  |
2014 Acquirees [Member] |  |  |  |  |
ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications [Line Items] |  |  |  |  |
Goodwill | $ 24,841 |  |  |  |
Indefinite life intangible assets | 6,669 |  |  |  |
Amortizable intangible assets | 17,706 |  |  |  |
Total Goodwill and Intangibles | 49,216 |  |  |  |
2014 Acquirees [Member] | Customer relationships [Member] |  |  |  |  |
ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications [Line Items] |  |  |  |  |
Amortizable intangible assets | 17,706 |  |  |  |
2014 Acquirees [Member] | Trade names [Member] |  |  |  |  |
ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications [Line Items] |  |  |  |  |
Indefinite life intangible assets | $ 6,669 |  |  |  |
Cyclone [Member] |  |  |  |  |
ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications [Line Items] |  |  |  |  |
Goodwill |  |  |  | $ 13,587 |
Indefinite life intangible assets |  |  |  | 3,548 |
Amortizable intangible assets |  |  |  | 11,608 |
Total Goodwill and Intangibles |  |  |  | 28,743 |
Cyclone [Member] | Customer relationships [Member] |  |  |  |  |
ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications [Line Items] |  |  |  |  |
Amortizable intangible assets |  |  |  | 11,608 |
Cyclone [Member] | Trade names [Member] |  |  |  |  |
ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications [Line Items] |  |  |  |  |
Indefinite life intangible assets |  |  |  | $ 3,548 |
Northcote Pottery [Member] |  |  |  |  |
ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications [Line Items] |  |  |  |  |
Goodwill |  |  |  |  | $ 11,254
Indefinite life intangible assets |  |  |  |  | 3,121
Amortizable intangible assets |  |  |  |  | 6,098
Total Goodwill and Intangibles |  |  |  |  | 20,473
Northcote Pottery [Member] | Customer relationships [Member] |  |  |  |  |
ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications [Line Items] |  |  |  |  |
Amortizable intangible assets |  |  |  |  | 6,098
Northcote Pottery [Member] | Trade names [Member] |  |  |  |  |
ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications [Line Items] |  |  |  |  |
Indefinite life intangible assets |  |  |  |  | $ 3,121

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