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Employee Benefit Plans (Tables) | 12 Months Ended
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Sep. 30, 2021
Compensation Related Costs [Abstract] |
Additional information related to time-based RSU activity | The following table provides additional information related to time-based RSU activity during fiscal 2021, 2020 and 2019. The number of restricted stock units vested includes shares of common stock withheld by the Company on behalf of employees to satisfy the tax withholding requirements.
| Year Ended September 30,
| 2021 |  | 2020 |  | 2019
| Number of Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Number of Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Number of Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Outstanding at beginning of year | 4,725,701 |  |  | $ | 34.79 |  |  | 4,889,534 |  |  | $ | 33.01 |  |  | 4,797,922 |  |  | $ | 31.77 |
Granted | 856,615 |  |  | 83.13 |  |  | 1,657,935 |  |  | 35.98 |  |  | 1,796,200 |  |  | 33.75 |
Vested | (1,644,263) |  |  | 33.26 |  |  | (1,651,840) |  |  | 30.85 |  |  | (1,430,826) |  |  | 29.83 |
Cancelled | (120,788) |  |  | 39.16 |  |  | (169,928) |  |  | 33.24 |  |  | (273,762) |  |  | 32.82 |
Outstanding at end of year | 3,817,265 |  |  | $ | 46.16 |  |  | 4,725,701 |  |  | $ | 34.79 |  |  | 4,889,534 |  |  | $ | 33.01 |
Additional information related to performance-based RSUs outstanding | The following table provides additional information related to the performance-based RSUs outstanding at September 30, 2021.
Grant Date |  | Vesting Date |  | Target Number of Performance Units |  | Grant Date Fair Value per Unit |  | Compensation Expense Year Ended September 30,
| 2021 |  | 2020 |  | 2019
|  |  |  |  |  |  |  | (In millions)
November 2018 |  | September 2021 |  | 360,000 |  | $ | 37.75 |  |  | $ | 7.2 |  |  | $ | 6.7 |  |  | $ | 6.1 |
November 2019 |  | September 2022 |  | 360,000 |  | 52.54 |  |  | 10.1 |  |  | 9.3 |  |  | — |
November 2020 |  | September 2023 |  | 360,000 |  | 70.60 |  |  | 12.5 |  |  | — |  |  | — |
|  |  |  |  |  |  |  | $ | 29.8 |  |  | $ | 16.0 |  |  | $ | 6.1 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] | The following table provides information related to stock option activity during those years.
| Year Ended September 30,
| 2021 |  | 2020 |  | 2019
| Stock Options |  | Weighted Average Exercise Price |  | Stock Options |  | Weighted Average Exercise Price |  | Stock Options |  | Weighted Average Exercise Price
Outstanding at beginning of year | 2,224,415 |  |  | $ | 19.94 |  |  | 3,184,157 |  |  | $ | 19.53 |  |  | 5,856,959 |  |  | $ | 17.25 |
Exercised | (1,108,639) |  |  | 16.02 |  |  | (959,742) |  |  | 18.58 |  |  | (2,634,802) |  |  | 14.47 |
Cancelled or expired | — |  |  | — |  |  | — |  |  | — |  |  | (38,000) |  |  | 18.98 |
Outstanding at end of year | 1,115,776 |  |  | $ | 23.84 |  |  | 2,224,415 |  |  | $ | 19.94 |  |  | 3,184,157 |  |  | $ | 19.53 |
Exercisable at end of year | 1,115,776 |  |  | $ | 23.84 |  |  | 2,224,415 |  |  | $ | 19.94 |  |  | 3,184,157 |  |  | $ | 19.53 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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