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Debt - AmeriGas Propane (Details) - AmeriGas Partners - USD ($) | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Debt Instrument |  |
Aggregate principal amount of tendered notes redeemed |  | $ 1,270,000,000
Senior Notes | 5.50% due May 2025 |  |
Debt Instrument |  |
Aggregate principal amount | $ 700,000,000 |
Stated interest rate | 5.50% |
Senior Notes | 5.75% due May 2027 |  |
Debt Instrument |  |
Aggregate principal amount | $ 525,000,000 |
Stated interest rate | 5.75% |
Senior Notes | 7.00% Senior Notes |  |
Debt Instrument |  |
Stated interest rate | 7.00% |
Aggregate principal balance repaid | $ 980,800,000 |
Senior Notes | 5.625% due May 2024 |  |
Debt Instrument |  |
Aggregate principal amount |  | $ 675,000,000
Stated interest rate |  | 5.625%
Senior Notes | 5.875% due August 2026 |  |
Debt Instrument |  |
Aggregate principal amount |  | $ 675,000,000
Stated interest rate |  | 5.875%
Senior Notes | 6.50% Senior Notes, due 2021 |  |
Debt Instrument |  |
Stated interest rate |  | 6.50%
Senior Notes | 6.75% Senior Notes, due 2020 |  |
Debt Instrument |  |
Stated interest rate |  | 6.75%
Senior Notes | 6.25% Senior Notes, due 2019 |  |
Debt Instrument |  |
Stated interest rate |  | 6.25%

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