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Equity - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2020
Stock-based compensation |  |  |  |
Deferred vested award (in shares) | 268 |  |  |
Intrinsic value vested | $ 59,000,000 |  |  |
Share-based compensation expense | 28,600,000 | $ 23,700,000 | $ 20,800,000 |
Income tax benefit recognized | 13,500,000 | $ 8,000,000 | $ 9,900,000 |
Unrecognized compensation cost | $ 45,700,000 |  |  |
Unrecognized compensation costs, period for recognition | 1 year 3 months 18 days |  |  |
Granted (in dollars per share) | $ 76.80 |  |  |
Stock repurchase programs, authorized amount |  |  |  | $ 200,000,000
Common shares repurchased (in shares) | 100 | 2,800 | 700 |
Common shares repurchased, cost | $ 3,363,000 | $ 166,959,000 | $ 46,797,000 |
Amount remaining available for future stock repurchases | $ 146,700,000 |  |  |
Performance Stock Units |  |  |  |
Stock-based compensation |  |  |  |
Vesting period | 3 years |  |  |
Unrecognized compensation costs, period for recognition | 3 years |  |  |
Performance Stock Units | Minimum |  |  |  |
Stock-based compensation |  |  |  |
Vesting rights, percentage | 0.00% |  |  |
Performance Stock Units | Maximum |  |  |  |
Stock-based compensation |  |  |  |
Vesting rights, percentage | 200.00% |  |  |
Restricted Stock Units |  |  |  |
Stock-based compensation |  |  |  |
Granted (in dollars per share) |  | $ 74.26 | $ 66.96 |
Total fair value | $ 28,900,000 | $ 23,600,000 | $ 27,400,000 |
Restricted Stock Units | Member of Board of Directors |  |  |  |
Stock-based compensation |  |  |  |
Vesting period | 1 year |  |  |
Restricted Stock Units | Minimum |  |  |  |
Stock-based compensation |  |  |  |
Vesting period | 4 years |  |  |
Restricted Stock Units | Maximum |  |  |  |
Stock-based compensation |  |  |  |
Vesting period | 5 years |  |  |

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