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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RECENTLY ADOPTED ACCOUNTING STANDARDS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Deferred taxes (current) |  | $ 0 |
Total current assets | $ 607,264 | 488,215 |
Other noncurrent assets | 68,708 | 61,915 |
Total noncurrent assets | 712,166 | 667,881 |
Total assets | 3,727,082 | 3,284,357 | $ 3,125,388
Deferred income taxes | 473,847 | 444,935 |
Total noncurrent liabilities | 925,333 | 897,706 |
Total capitalization and liabilities | 3,727,082 | 3,284,357 |
Excess tax benefits, stock compensation | 1,800 |  |
Tax benefit from stock based compensation | 1,755 | 881 | 414
Other noncurrent liabilities | 21,336 | 27,841 | 20,724
Net cash flows provided from operating activities |  | 390,947 | 358,149
Tax benefit from stock options exercised |  | 0 | 0
Tax withholding payments related to net settled stock compensation | (3,547) | (2,146) | (949)
Cash flows (used in) financing activities | $ 253,178 | (66,441) | (76,372)
As Previously Reported |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
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 |
Deferred income taxes |  | 499,616 |
Total noncurrent liabilities |  | 952,387 |
Total capitalization and liabilities |  | 3,339,038 |
Tax benefit from stock based compensation |  | 0 | 0
Other noncurrent liabilities |  | 25,695 | 19,775
Net cash flows provided from operating activities |  | 387,920 | 356,786
Tax benefit from stock options exercised |  | 881 | 414
Tax withholding payments related to net settled stock compensation |  | 0 | 0
Cash flows (used in) financing activities |  | (63,414) | (75,009)
Effect of Change |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Deferred taxes (current) |  | (56,296) |
Total current assets |  | (56,296) |
Other noncurrent assets |  | 1,615 |
Total noncurrent assets |  | 1,615 |
Total assets |  | (54,681) |
Deferred income taxes |  | (54,681) |
Total noncurrent liabilities |  | (54,681) |
Total capitalization and liabilities |  | (54,681) |
Tax benefit from stock based compensation |  | 881 | 414
Other noncurrent liabilities |  | 2,146 | 949
Net cash flows provided from operating activities |  | 3,027 | 1,363
Tax benefit from stock options exercised |  | (881) | (414)
Tax withholding payments related to net settled stock compensation |  | (2,146) | (949)
Cash flows (used in) financing activities |  | $ (3,027) | $ (1,363)

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