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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