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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NEW ACCOUNTING STANDARD (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Sep. 30, 2015
Assets    
Deferred taxes (current)   $ 0
Total current assets $ 459,861 488,215
Other noncurrent assets 69,305 61,915
Total noncurrent assets 717,075 667,881
Total assets 3,419,594 3,284,357
Capitalization and Liabilities    
Deferred income taxes 464,343 444,935
Total noncurrent liabilities 889,854 897,706
Total capitalization and liabilities $ 3,419,594 3,284,357
As Previously Reported [Member]    
Assets    
Deferred taxes (current)   56,296
Total current assets   544,511
Other noncurrent assets   60,300
Total noncurrent assets   666,266
Total assets   3,339,038
Capitalization and Liabilities    
Deferred income taxes   499,616
Total noncurrent liabilities   952,387
Total capitalization and liabilities   3,339,038
Effect of Change [Member]    
Assets    
Deferred taxes (current)   (56,296)
Total current assets   (56,296)
Other noncurrent assets   1,615
Total noncurrent assets   1,615
Total assets   (54,681)
Capitalization and Liabilities    
Deferred income taxes   (54,681)
Total noncurrent liabilities   (54,681)
Total capitalization and liabilities   $ (54,681)