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Common Stock and Equity-Based Compensation - Common Stock Share Activity (Details) - Common Stock - shares | 12 Months Ended |
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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)

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