SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NATURAL GAS IN STORAGE (Details) $ in Thousands |
Mar. 31, 2026
USD ($)
Bcf
|
Sep. 30, 2025
USD ($)
Bcf
|
|---|---|---|
| Inventory [Line Items] | ||
| Natural Gas in Storage, value | $ | $ 60,534 | $ 215,836 |
| Natural Gas in Storage, Bcf | Bcf | 12,400,000 | 44,300,000 |
| NJNG | ||
| Inventory [Line Items] | ||
| Natural Gas in Storage, value | $ | $ 42,487 | $ 184,099 |
| Natural Gas in Storage, Bcf | Bcf | 6,800,000 | 30,800,000 |
| ES | ||
| Inventory [Line Items] | ||
| Natural Gas in Storage, value | $ | $ 16,788 | $ 30,686 |
| Natural Gas in Storage, Bcf | Bcf | 5,200,000 | 13,200,000 |
| S&T | ||
| Inventory [Line Items] | ||
| Natural Gas in Storage, value | $ | $ 1,259 | $ 1,051 |
| Natural Gas in Storage, Bcf | Bcf | 400,000 | 300,000 |