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Equity - Narrative (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 02, 2022 | May 25, 2021 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Class of Stock [Line Items] |  |  |  |  |
Repurchases of Common Stock |  |  | $ 33,000,000 | $ 0 | $ 22,000,000
UGI Preferred Stock, without par value, shares authorized (in shares) |  |  | 5,000,000 | 5,000,000 |
Preferred stock, shares outstanding (in shares) |  |  | 0 | 0 |
Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Maximum number of shares authorized for repurchase (up to) (in shares) | 8,000,000 |  |  |  |
Stock repurchase program period | 4 years |  |  |  |
Stock Repurchased During Period, Shares |  |  | (1,000,000) |  | (600,000)
Common Stock | Treasury stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock Repurchased During Period, Shares |  |  | (1,000,000) |  | (600,000)
Capital Units | Preferred stock, without par value |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Units and shares sold (in shares) |  | 2,200,000 |  |  |
Notional value |  | $ 220,000,000 |  |  |
Issuance of Preferred Stock, net of issuance costs |  | $ 213,000,000 |  |  |
Capital Units | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Equity unit received by each holder (in shares) |  |  |  | 2.2973 |
Converted equity units (in shares) |  |  |  | 5,054,030 |
Convertible Preferred Stock | Preferred stock, without par value |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Units and shares sold (in shares) |  | 220,000 |  |  |

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- Definition Line items represent financial concepts included in a table. 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