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Supplemental Disclosures - Narrative (Details) - USD ($) shares in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020
Payments for Repurchase of Equity [Abstract] |  |  |
Repurchases of common stock | $ 166,959,000 | $ 45,414,000 |
Investments in mutual funds | 21,700,000 |  |
Interest paid | 1,200,000 | 2,300,000 |
Income taxes paid | $ 55,600,000 | $ 45,900,000 |
Restricted Stock Units (RSUs) |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |
Granted (in shares) | 300 |  |
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) | 2,767 | 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
Remaining authorized repurchase amount | $ 150,000,000.0 |  |

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