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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCOUNTING STANDARDS UPDATE - COMPENSATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operation and maintenance | $ 62,559 | $ 68,496 | $ 185,620 | $ 179,453
Total operating expenses | 438,961 | 580,150 | 1,951,239 | 2,049,558
Operating income | (4,019) | (36,715) | 161,725 | 218,225
Other income (expense), net | 1,829 | $ 1,731 | 5,456 | $ 8,735
Accounting Standards Update 2017-07 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operation and maintenance | 68,496 |  | 179,453 |
Total operating expenses | 580,150 |  | 2,049,558 |
Operating income | (36,715) |  | 218,225 |
Other income (expense), net | 1,731 |  | 8,735 |
Accounting Standards Update 2017-07 | As Previously Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operation and maintenance | 69,447 |  | 182,307 |
Total operating expenses | 581,101 |  | 2,052,412 |
Operating income | (37,666) |  | 215,371 |
Other income (expense), net | 2,682 |  | 11,589 |
Accounting Standards Update 2017-07 | Effect of Change |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operation and maintenance | (951) |  | (2,854) |
Total operating expenses | (951) |  | (2,854) |
Operating income | 951 |  | 2,854 |
Other income (expense), net | $ (951) |  | $ (2,854) |

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