SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NATURAL GAS IN STORAGE (Details) $ in Thousands |
Jun. 30, 2026
USD ($)
Bcf
|
Sep. 30, 2025
USD ($)
Bcf
|
|---|---|---|
| Inventory [Line Items] | ||
| Natural Gas in Storage, value | $ | $ 152,941 | $ 215,836 |
| Natural Gas in Storage, Bcf | Bcf | 34.8 | 44.3 |
| NJNG | ||
| Inventory [Line Items] | ||
| Natural Gas in Storage, value | $ | $ 118,286 | $ 184,099 |
| Natural Gas in Storage, Bcf | Bcf | 20.2 | 30.8 |
| ES | ||
| Inventory [Line Items] | ||
| Natural Gas in Storage, value | $ | $ 32,912 | $ 30,686 |
| Natural Gas in Storage, Bcf | Bcf | 14.1 | 13.2 |
| S&T | ||
| Inventory [Line Items] | ||
| Natural Gas in Storage, value | $ | $ 1,743 | $ 1,051 |
| Natural Gas in Storage, Bcf | Bcf | 0.5 | 0.3 |