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Common Stock and Equity-Based Compensation - Common Stock Share Activity (Details) - Common Stock - shares | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Common Stock Share Activity |  |  |  |
Beginning balance - shares Issued/Treasury (in shares) | 209,514,044 | 209,304,129 | 174,142,997 | 173,987,691
Beginning balance - shares Outstanding (in shares) | 209,004,789 | 173,748,975 | 173,143,737 |
Issued: |  |  |  |
Employee and director plans - shares Issued/Treasury (in shares) | 209,915 | 548,285 | 155,306 |
Employee and director plans - shares Outstanding (in shares) | 389,965 | 979,132 | 1,960,018 |
AmeriGas Merger -Issued (in shares) |  | 34,612,847 |  |
AmeriGas Merger - Outstanding (in shares) |  | 34,612,847 |  |
Sale of reacquired common stock - Outstanding (in shares) |  | 15,759 |  |
Reacquired common stock, employee and director plans - Outstanding (in shares) | (90,316) | (51,924) | (154,780) |
Ending balance - shares Issued/Treasury (in shares) | 209,514,044 | 209,304,129 | 174,142,997 | 173,987,691
Ending balance - shares Outstanding (in shares) | 208,354,438 | 209,004,789 | 173,748,975 |
Treasury |  |  |  |
Common Stock Share Activity |  |  |  |
Beginning balance - shares Issued/Treasury (in shares) | 1,159,606 | 299,340 | 394,022 | 843,954
Issued: |  |  |  |
Employee and director plans - shares Issued/Treasury (in shares) | 180,050 | 430,847 | 1,804,712 |
AmeriGas Merger -Issued (in shares) |  | 0 |  |
Sale of reacquired common stock - Treasury (in shares) |  | 15,759 |  |
Repurchases of common stock - Treasury (in shares) | (950,000) | (300,000) | (1,200,000) |
Reacquired common stock, employee and director plans - Treasury (in shares) | (90,316) | (51,924) | (154,780) |
Ending balance - shares Issued/Treasury (in shares) | 1,159,606 | 299,340 | 394,022 | 843,954

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