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Common Stock and Equity-Based Compensation - Common Stock Share Activity (Details) - Common Stock - shares
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Common Stock Share Activity        
Beginning balance - shares Issued/Treasury (in shares) 209,304,129 174,142,997 173,987,691 173,894,141
Beginning balance - shares Outstanding (in shares) 173,748,975 173,143,737 172,960,449  
Employee and director plans - shares Issued/Treasury (in shares) 548,285 155,306 93,550  
Employee and director plans - shares Outstanding (in shares) 979,132 1,960,018 1,145,254  
Sale of reacquired common stock - Outstanding (in shares) 15,759   50,000  
AmeriGas Merger -Issued (in shares) 34,612,847      
AmeriGas Merger - Outstanding (in shares) 34,612,847      
Reacquired common stock, employee and director plans - Outstanding (in shares) (51,924) (154,780) (111,966)  
Ending balance - shares Issued/Treasury (in shares) 209,304,129 174,142,997 173,987,691 173,894,141
Ending balance - shares Outstanding (in shares) 209,004,789 173,748,975 173,143,737  
Treasury        
Common Stock Share Activity        
Beginning balance - shares Issued/Treasury (in shares) (299,340) (394,022) (843,954) (933,692)
Employee and director plans - shares Issued/Treasury (in shares) 430,847 1,804,712 1,051,704  
Sale of reacquired common stock - Treasury (in shares) 15,759   50,000  
Repurchases of common stock - Treasury (in shares) (300,000) (1,200,000) (900,000)  
Reacquired common stock, employee and director plans - Treasury (in shares) (51,924) (154,780) (111,966)  
Ending balance - shares Issued/Treasury (in shares) (299,340) (394,022) (843,954) (933,692)