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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