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Shareholders' Equity - Narrative (Details) - $ / shares | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Class of Stock [Line Items] |  |
Stock repurchased (in shares) | 3,339,530 | 4,065,837
Additional shares authorized to be repurchased (in shares) | 4,627,231 |
Weighted average |  |
Class of Stock [Line Items] |  |
Weighted average cost of repurchased stock (in dollars per share) | $ 33.58 | $ 30.46

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