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Employee Benefit Plans - Stock Options (Details) - Share-based Payment Arrangement, Option [Member] - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Stock Options |  |  |
Outstanding at beginning of year, shares | 1,115,776 | 2,224,415 | 3,184,157
Exercised, shares | (292,290) | (1,108,639) | (959,742)
Canceled or expired, shares | 0 | 0 | 0
Outstanding at end of year, shares | 823,486 | 1,115,776 | 2,224,415
Exercisable at end of year, shares | 823,486 | 1,115,776 | 2,224,415
Weighted Average Exercise Price |  |  |
Outstanding at beginning of year, weighted average exercise price, per share | $ 23.84 | $ 19.94 | $ 19.53
Exercised, weighted average exercise price, per share | 23.83 | 16.02 | 18.58
Canceled or expired, weighted average exercise price, per share | 0 | 0 | 0
Outstanding at end of year, weighted average exercise price, per share | 23.84 | 23.84 | 19.94
Exercisable at end of year, weighted average exercise price, per share | $ 23.84 | $ 23.84 | $ 19.94
Additional information - stock options |  |  |
Expiration period | 10 years |  |
Total intrinsic value of options exercised | $ 23.0 | $ 82.5 | $ 41.2
Aggregate intrinsic value of options outstanding | $ 35.8 |  |
Lower range of options outstanding exercise price | $ 23.57 |  |
Upper range of options outstanding exercise price | $ 23.86 |  |
Weighted average remaining contractual term of options outstanding | 1 year 1 month 6 days |  |

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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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