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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)

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