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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PROPERTY PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Composite rate of depreciation |  | 2.25% | 2.32% | 2.31%
Depreciation and amortization |  | $ 81,841 | $ 72,748 | $ 61,399
Property Classifications |  |  |  |
Total property, plant and equipment |  | 3,211,070 | 2,955,130 |
Accumulated depreciation and amortization |  | (601,329) | (547,478) |
Property, plant and equipment, net |  | 2,609,741 | 2,407,652 |
Composite rate of depreciation | 2.40% |  |  |
Regulated Operation | Distribution facilities |  |  |  |
Property Classifications |  |  |  |
Total property, plant and equipment |  | $ 1,952,697 | 1,823,672 |
Regulated Operation | Distribution facilities | Minimum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 38 years |  |
Regulated Operation | Distribution facilities | Maximum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 74 years |  |
Regulated Operation | Transmission facilities |  |  |  |
Property Classifications |  |  |  |
Total property, plant and equipment |  | $ 294,586 | 292,433 |
Regulated Operation | Transmission facilities | Minimum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 35 years |  |
Regulated Operation | Transmission facilities | Maximum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 56 years |  |
Regulated Operation | Storage facilities |  |  |  |
Property Classifications |  |  |  |
Total property, plant and equipment |  | $ 78,245 | 78,238 |
Regulated Operation | Storage facilities | Minimum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 34 years |  |
Regulated Operation | Storage facilities | Maximum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 47 years |  |
Unregulated Operation | Solar property |  |  |  |
Property Classifications |  |  |  |
Total property, plant and equipment |  | $ 587,345 | 479,948 |
Unregulated Operation | Solar property | Minimum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 20 years |  |
Unregulated Operation | Solar property | Maximum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 25 years |  |
Unregulated Operation | Wind property |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 25 years |  |
Total property, plant and equipment |  | $ 244,764 | 228,644 |
Unregulated Operation | All other property |  |  |  |
Property Classifications |  |  |  |
Total property, plant and equipment |  | $ 53,433 | $ 52,195 |
Unregulated Operation | All other property | Minimum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 5 years |  |
Unregulated Operation | All other property | Maximum |  |  |  |
Property Classifications |  |  |  |
Estimated Useful Lives |  | 35 years |  |

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