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Employee Benefit Plans (Tables) | 12 Months Ended
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Sep. 30, 2017
Compensation Related Costs [Abstract] |
Summarized information related to activity under the Company's Stock Incentive Plan | The Company did not grant stock options during fiscal 2017, 2016 or 2015, however the following table provides additional information related to stock option activity during those years.
| Year Ended September 30,
| 2017 |  | 2016 |  | 2015
| Stock Options |  | Weighted Average Exercise Price |  | Stock Options |  | Weighted Average Exercise Price |  | Stock Options |  | Weighted Average Exercise Price
Outstanding at beginning of year | 11,395,917 |  |  | $ | 16.69 |  |  | 15,337,656 |  |  | $ | 17.50 |  |  | 19,478,811 |  |  | $ | 17.37 |
Exercised | (2,770,569 | ) |  | 15.83 |  |  | (3,504,989 | ) |  | 20.02 |  |  | (3,636,655 | ) |  | 16.49 |
Cancelled or expired | (194,000 | ) |  | 18.83 |  |  | (436,750 | ) |  | 18.45 |  |  | (504,500 | ) |  | 19.89 |
Outstanding at end of year | 8,431,348 |  |  | $ | 16.92 |  |  | 11,395,917 |  |  | $ | 16.69 |  |  | 15,337,656 |  |  | $ | 17.50 |
Exercisable at end of year | 5,772,214 |  |  | $ | 16.01 |  |  | 6,645,967 |  |  | $ | 14.99 |  |  | 6,859,889 |  |  | $ | 16.51 |
Additional information related to performance-based RSUs outstanding | The following table provides additional information related to the performance-based RSUs outstanding at September 30, 2017.
Grant Date |  | Vesting Date |  | Target Number of Performance Units |  | Grant Date Fair Value per Unit |  | Compensation Expense Year Ended September 30,
| 2017 |  | 2016 |  | 2015
|  |  |  |  |  |  |  | (In millions)
November 2014 |  | September 2017 |  | 290,000 |  | $ | 23.62 |  |  | $ | 3.8 |  |  | $ | 4.1 |  |  | $ | 3.4 |
November 2015 |  | September 2018 |  | 330,000 |  | 30.81 |  |  | 6.8 |  |  | 4.0 |  |  | — |
November 2016 |  | September 2019 |  | 330,000 |  | 29.20 |  |  | 5.1 |  |  | — |  |  | — |
|  |  |  |  |  |  |  | $ | 15.7 |  |  | $ | 8.1 |  |  | $ | 3.4 |
Additional information related to time-based RSU activity | The following table provides additional information related to time-based RSU activity during fiscal 2017, 2016 and 2015.
| Year Ended September 30,
| 2017 |  | 2016 |  | 2015
| 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 | 3,478,233 |  |  | $ | 24.12 |  |  | 1,978,262 |  |  | $ | 25.60 |  |  | 26,668 |  |  | $ | 21.49 |
Granted | 1,868,660 |  |  | 28.64 |  |  | 2,117,330 |  |  | 23.14 |  |  | 2,036,900 |  |  | 26.02 |
Vested | (792,941 | ) |  | 24.48 |  |  | (423,427 | ) |  | 25.57 |  |  | (12,221 | ) |  | 21.48 |
Cancelled | (188,170 | ) |  | 25.21 |  |  | (193,932 | ) |  | 25.05 |  |  | (73,085 | ) |  | 26.06 |
Outstanding at end of year | 4,365,782 |  |  | $ | 26.09 |  |  | 3,478,233 |  |  | $ | 24.12 |  |  | 1,978,262 |  |  | $ | 25.60 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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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