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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - RECENTLY ADOPTED ACCOUNTING STANDARDS (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Other noncurrent assets $ 74,818 $ 60,196  
Total noncurrent assets 739,322 703,654  
Total assets 3,928,507 3,718,570 $ 3,284,357
Long-term debt 997,080 1,055,038  
Total capitalization 2,233,723 2,221,629  
Total capitalization and liabilities $ 3,928,507 3,718,570  
As Previously Reported      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Other noncurrent assets   68,708  
Total noncurrent assets   712,166  
Total assets   3,727,082  
Long-term debt   1,063,550  
Total capitalization   2,230,141  
Total capitalization and liabilities   3,727,082  
Effect of Change      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Other noncurrent assets   (8,512)  
Total noncurrent assets   (8,512)  
Total assets   (8,512)  
Long-term debt   (8,512)  
Total capitalization   (8,512)  
Total capitalization and liabilities   $ (8,512)