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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PROPERTY PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 01, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Property Classifications |  |  |  |
Total property, plant and equipment |  | $ 4,464,966 | $ 3,501,407 |
Accumulated depreciation and amortization |  | (742,197) | (691,774) |
Property, plant and equipment, net |  | 3,722,769 | 2,809,633 |
Utility | Distribution facilities |  |  |  |
Property Classifications |  |  |  |
Total property, plant and equipment |  | $ 2,688,885 | 2,419,381 |
Utility | Distribution facilities | Minimum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 38 years |  |
Utility | Distribution facilities | Maximum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 74 years |  |
Utility | Transmission facilities |  |  |  |
Property Classifications |  |  |  |
Total property, plant and equipment |  | $ 332,947 | 330,912 |
Utility | Transmission facilities | Minimum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 35 years |  |
Utility | Transmission facilities | Maximum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 56 years |  |
Utility | Storage facilities |  |  |  |
Property Classifications |  |  |  |
Total property, plant and equipment |  | $ 79,922 | 79,916 |
Utility | Storage facilities | Minimum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 34 years |  |
Utility | Storage facilities | Maximum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 47 years |  |
Nonutility | Solar property |  |  |  |
Property Classifications |  |  |  |
Total property, plant and equipment |  | $ 674,930 | $ 593,867 |
Nonutility | Solar property | Minimum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives | 15 years | 15 years | 15 years | 15 years
Nonutility | Solar property | Maximum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives | 35 years | 35 years | 25 years | 25 years
Nonutility | Storage and transportation property |  |  |  |
Property Classifications |  |  |  |
Total property, plant and equipment |  | $ 428,491 | $ 28,445 |
Nonutility | Storage and transportation property | Minimum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 5 years |  |
Nonutility | Storage and transportation property | Maximum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 50 years |  |
Nonutility | All other property |  |  |  |
Property Classifications |  |  |  |
Total property, plant and equipment |  | $ 259,791 | $ 48,886 |
Nonutility | All other property | Minimum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 5 years |  |
Nonutility | All other property | Maximum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 35 years |  |

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