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ACQUISITIONS - Summary of Identifiable Intangible Assets and Estimated Useful Lives (Details) - USD ($)
$ in Thousands
Aug. 31, 2017
Sep. 30, 2016
Milgram & Company Ltd. | Customer relationships    
Business Acquisition [Line Items]    
Estimated Life (years) 7 years  
Identifiable intangible assets $ 14,004  
APC Logistics    
Business Acquisition [Line Items]    
Identifiable intangible assets   $ 78,842
APC Logistics | Customer relationships    
Business Acquisition [Line Items]    
Estimated Life (years)   7 years
Identifiable intangible assets   $ 78,842