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ACQUISITIONS (Details) - Summary of Goodwill and Intangible Asset Classifications - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
May. 21, 2014
Business Acquisition [Line Items]        
Goodwill $ 362,745 $ 375,294    
Customer relationships [Member]        
Business Acquisition [Line Items]        
Amortization Period (Years) 25 years      
Recent Acquirees [Member]        
Business Acquisition [Line Items]        
Goodwill $ 26,024      
Total Goodwill and Intangibles 50,399      
Recent Acquirees [Member] | Customer relationships [Member]        
Business Acquisition [Line Items]        
Amortizable intangible assets 17,706      
Recent Acquirees [Member] | Tradenames [Member]        
Business Acquisition [Line Items]        
Indefinite life intangible assets $ 6,669      
Cyclone [Member]        
Business Acquisition [Line Items]        
Goodwill       $ 14,770
Indefinite life intangible assets       3,548
Amortizable intangible assets       11,608
Total Goodwill and Intangibles       29,926
Cyclone [Member] | Customer relationships [Member]        
Business Acquisition [Line Items]        
Amortizable intangible assets       11,608
Cyclone [Member] | Tradenames [Member]        
Business Acquisition [Line Items]        
Indefinite life intangible assets       $ 3,548
Northcote [Member]        
Business Acquisition [Line Items]        
Goodwill     $ 11,254  
Indefinite life intangible assets     3,121  
Amortizable intangible assets     6,098  
Total Goodwill and Intangibles     20,473  
Northcote [Member] | Customer relationships [Member]        
Business Acquisition [Line Items]        
Amortizable intangible assets     6,098  
Northcote [Member] | Tradenames [Member]        
Business Acquisition [Line Items]        
Indefinite life intangible assets     $ 3,121