| Component: (Network and Table) | |
|---|---|
| Network | 00000049 - Disclosure - Long-term Debt (Schedule of Aggregates of Long-term Debt) (Details) (http://corninggas.com/role/Disclosure-Long-termDebtScheduleofAggregatesofLong-termDebtDetails) |
| Table | (Implied) |
| Reporting Entity [Axis] | 0001582244 (http://www.sec.gov/CIK) |
| Debt Disclosure [Abstract] | Period [Axis] |
|---|---|
2016-09-30 | |
Debt Disclosure [Abstract] | |
Aggregate maturity of debt in fiscal year: | |
2017 | |
2018 | |
2019 | |
2020 | |
2021 | |
2022+ |