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Supplemental Disclosures (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018
Payments for Repurchase of Equity [Abstract] |  |  |  |
Repurchases of common stock | $ 61,576,000 | $ 45,414,000 | $ 62,614,000 |
Line of Credit Facility [Abstract] |  |  |  |
Long-term debt |  | 268,000 |  | $ 374,000
Loss Contingency, Information about Litigation Matters [Abstract] |  |  |  |
Loss contingency, maximum potential loss |  | 31,000,000.0 |  |
Credit Agreement Expiring 2022 |  |  |  |
Debt Instrument, Periodic Payment [Abstract] |  |  |  |
Interest paid |  | 2,300,000 | $ 100,000 |
Credit Agreement Expiring 2022 | Line of Credit |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Long-term debt |  | 0 |  |
Mutual Fund |  |  |  |
Retirement Benefits [Abstract] |  |  |  |
Investments in mutual funds |  | $ 20,700,000 |  |
Restricted Stock Units (RSUs) |  |  |  |
Employee Benefits and Share-based Compensation, Noncash [Abstract] |  |  |  |
Granted (in shares) |  | 355,000 |  |
Vesting period |  | 5 years |  |
Restricted Stock Units (RSUs) | Member of Board of Directors |  |  |  |
Employee Benefits and Share-based Compensation, Noncash [Abstract] |  |  |  |
Vesting period |  | 1 year |  |
Common Stock |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Common shares purchased | 995,000 | 716,000 | 1,012,000 |
Stock Repurchase Program, June 2018 | Common Stock |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Stock repurchase programs, authorized amount |  | $ 200,000,000 |  |
Common shares purchased |  | 700,000 |  |
Repurchases of common stock |  | $ 45,400,000 |  |
Stock Repurchase Program, August 2015 | Common Stock |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Common shares purchased |  |  | 1,000,000.0 |
Repurchases of common stock |  |  | $ 62,600,000 |
Stock Repurchase Authorized Program, June 2018 | Common Stock |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Amount remaining available for future stock repurchases |  | $ 147,400,000 |  |

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