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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCOUNTING STANDARDS UPDATE - COMPENSATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operation and maintenance | $ 62,959 | $ 56,797 | $ 123,061 | $ 110,957
Total operating expenses | 789,254 | 840,299 | 1,512,278 | 1,469,408
Operating income | 77,001 | 178,744 | 165,744 | 254,940
Other income (expense), net | 2,758 | $ 1,028 | 3,627 | $ 7,004
Accounting Standards Update 2017-07 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operation and maintenance | 56,797 |  | 110,957 |
Total operating expenses | 840,299 |  | 1,469,408 |
Operating income | 178,744 |  | 254,940 |
Other income (expense), net | 1,028 |  | 7,004 |
Accounting Standards Update 2017-07 | As Previously Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operation and maintenance | 57,749 |  | 112,860 |
Total operating expenses | 841,251 |  | 1,471,311 |
Operating income | 177,792 |  | 253,037 |
Other income (expense), net | 1,980 |  | 8,907 |
Accounting Standards Update 2017-07 | Effect of Change |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operation and maintenance | (952) |  | (1,903) |
Total operating expenses | (952) |  | (1,903) |
Operating income | 952 |  | 1,903 |
Other income (expense), net | $ (952) |  | $ (1,903) |

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