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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) |

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