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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - IMPACT OF ASC 470 ON THE UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Nonutility plant and equipment, at cost | $ 1,108,512 | $ 576,174 |  |
Accumulated depreciation and amortization, nonutility plant and equipment | (140,562) | (106,614) |  |
Property, plant and equipment, net | 3,722,769 | 2,809,633 |  |
Other noncurrent assets | 85,657 | 116,059 |  |
Total noncurrent assets | 971,376 | 836,703 |  |
Total assets | 5,316,477 | 4,157,942 | $ 3,986,304 |
CAPITALIZATION |  |  |  |
Retained earnings | 947,501 | 906,076 |  |
Reclassification of certain income tax effects to retained earnings | 1,643,896 | 1,381,833 | 1,294,664 | $ 1,114,752
Total capitalization | 3,903,362 | 2,919,010 |  |
Liabilities [Abstract] |  |  |  |
Deferred income taxes | 138,081 | 145,504 |  |
Total noncurrent liabilities | 879,393 | 792,555 |  |
Total capitalization and liabilities | 5,316,477 | 4,157,942 |  |
Previously Reported |  |  |  |
Assets [Abstract] |  |  |  |
Nonutility plant and equipment, at cost | 1,430,723 | 861,904 |  |
Accumulated depreciation and amortization, nonutility plant and equipment | (202,507) | (156,033) |  |
Property, plant and equipment, net | 3,983,035 | 3,045,944 |  |
Other noncurrent assets | 78,716 | 94,791 |  |
Total noncurrent assets | 964,435 | 815,435 |  |
Total assets | 5,569,802 | 4,372,985 |  |
CAPITALIZATION |  |  |  |
Retained earnings | 1,148,297 | 1,075,960 |  |
Reclassification of certain income tax effects to retained earnings | 1,844,692 | 1,551,717 | 1,418,978 | 1,236,643
Total capitalization | 4,104,158 | 3,088,894 |  |
Liabilities [Abstract] |  |  |  |
Deferred income taxes | 190,610 | 190,663 |  |
Total noncurrent liabilities | 931,922 | 837,714 |  |
Total capitalization and liabilities | 5,569,802 | 4,372,985 |  |
Effect of Change |  |  |  |
Assets [Abstract] |  |  |  |
Nonutility plant and equipment, at cost | (322,211) | (285,730) |  |
Accumulated depreciation and amortization, nonutility plant and equipment | 61,945 | 49,419 |  |
Property, plant and equipment, net | (260,266) | (236,311) |  |
Other noncurrent assets | 6,941 | 21,268 |  |
Total noncurrent assets | 6,941 | 21,268 |  |
Total assets | (253,325) | (215,043) |  |
CAPITALIZATION |  |  |  |
Retained earnings | (200,796) | (169,884) |  |
Reclassification of certain income tax effects to retained earnings | (200,796) | (169,884) | $ (124,314) | $ (121,891)
Total capitalization | (200,796) | (169,884) |  |
Liabilities [Abstract] |  |  |  |
Deferred income taxes | (52,529) | (45,159) |  |
Total noncurrent liabilities | (52,529) | (45,159) |  |
Total capitalization and liabilities | $ (253,325) | $ (215,043) |  |

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