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Supplemental Disclosures - Narrative (Details) - USD ($) shares in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Payments for Repurchase of Equity [Abstract] |  |  |  |
Repurchases of common stock | $ 165,061,000 | $ 4,084,000 | $ 166,959,000 | $ 45,414,000
Investments in mutual funds | $ 18,400,000 |  | 18,400,000 |
Interest paid |  |  | 500,000 | 1,800,000
Income taxes paid |  |  | $ 52,900,000 | $ 37,200,000
Restricted Stock Units (RSUs) |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Granted (in shares) |  |  | 316 |
Vesting period |  |  | 5 years |
Restricted Stock Units (RSUs) | Member of Board of Directors |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Vesting period |  |  | 1 year |
Common Stock |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Common shares repurchased (in shares) | 2,741 | 62 | 2,767 | 716
Repurchases of common stock |  |  | $ 167,000,000.0 | $ 45,400,000
Stock Repurchase Program, March 2020 | Common Stock |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Stock repurchase programs, authorized amount | $ 200,000,000 |  | 200,000,000 |
Amount remaining available for future stock repurchases | $ 150,000,000.0 |  | $ 150,000,000.0 |

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