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Debt (Details) - USD ($)
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Oct. 31, 2016
Line of Credit Facility      
Loss on early repayment of notes $ 33,200,000 $ 0  
UGI Utilities | Senior Notes | Senior Notes due October 2046      
Line of Credit Facility      
Debt issued     $ 100,000,000
Stated interest rate     4.12%
Amerigas Propane | Senior Notes | 5.50% Senior Notes due May 2025      
Line of Credit Facility      
Debt issued $ 700,000,000    
Stated interest rate 5.50%    
Amerigas Propane | Senior Notes | 7.00% Senior Notes      
Line of Credit Facility      
Stated interest rate 7.00%    
Aggregate principal balance of notes redeemed $ 500,000,000    
Loss on early repayment of notes 33,200,000    
Redemption premium 28,700,000    
Write-off of unamortized debt issuance costs $ 4,500,000