Supplemental Disclosures - Narrative (Details) - USD ($) shares in Thousands |
3 Months Ended | 6 Months Ended | |
|---|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2021 |
Mar. 31, 2020 |
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| Payments for Repurchase of Equity [Abstract] | |||
| Repurchases of common stock | $ 165,061,000 | $ 3,363,000 | $ 166,959,000 |
| Investments in mutual funds | $ 27,100,000 | ||
| Restricted Stock Units (RSUs) | |||
| Payments for Repurchase of Equity [Abstract] | |||
| Granted (in shares) | 315 | ||
| Vesting period | 4 years | 5 years | |
| Performance-based RSUs | |||
| Payments for Repurchase of Equity [Abstract] | |||
| Granted (in shares) | 85 | ||
| Vesting period | 3 years | ||
| Common Stock | |||
| Payments for Repurchase of Equity [Abstract] | |||
| Common shares repurchased (in shares) | 2,741 | 52 | 2,767 |
| Repurchases of common stock | $ 3,400,000 | $ 167,000,000.0 | |
| Stock Repurchase Program, March 2020 | Common Stock | |||
| Payments for Repurchase of Equity [Abstract] | |||
| Stock repurchase programs, authorized amount | $ 200,000,000 | $ 200,000,000 | |
| Remaining authorized repurchase amount | $ 146,700,000 | ||
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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of stock repurchase plan authorized. No definition available.
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- Definition Amount remaining of a stock repurchase plan authorized. No definition available.
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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