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Employee Benefit Plans (Tables) | 12 Months Ended
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Sep. 30, 2016
Compensation Related Costs [Abstract] |
Summarized information related to activity under the Company's Stock Incentive Plan | The following table provides additional information related to stock option activity during fiscal 2016, 2015 and 2014.
| Year Ended September 30,
| 2016 |  | 2015 |  | 2014
| Stock Options |  | Weighted Average Exercise Price |  | Stock Options |  | Weighted Average Exercise Price |  | Stock Options |  | Weighted Average Exercise Price
Outstanding at beginning of year | 15,337,656 |  |  | $ | 17.50 |  |  | 19,478,811 |  |  | $ | 17.37 |  |  | 18,962,536 |  |  | $ | 15.91 |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | 3,856,166 |  |  | 23.85 |
Exercised | (3,504,989 | ) |  | 31.21 |  |  | (3,636,655 | ) |  | 28.75 |  |  | (2,687,724 | ) |  | 16.30 |
Cancelled or expired | (436,750 | ) |  | 18.45 |  |  | (504,500 | ) |  | 19.89 |  |  | (652,167 | ) |  | 17.68 |
Outstanding at end of year | 11,395,917 |  |  | $ | 16.69 |  |  | 15,337,656 |  |  | $ | 17.50 |  |  | 19,478,811 |  |  | $ | 17.37 |
Exercisable at end of year | 6,645,967 |  |  | $ | 14.99 |  |  | 6,859,889 |  |  | $ | 16.51 |  |  | 7,207,978 |  |  | $ | 16.27 |
Weighted average assumptions of stock options | The fair value of the options was determined on the date of grant using the Black-Scholes option pricing model based on the following weighted average assumptions:
| Year Ended
| September 30, 2014
Risk free interest rate | 2.01%
Expected life (in years) | 6.48
Expected volatility | 48.80%
Expected dividend yield | 0.63%
Additional information related to performance-based RSUs outstanding | The following table provides additional information related to the performance-based RSUs outstanding at September 30, 2016.
Grant Date |  | Vesting Date |  | Target Number of Performance Units |  | Grant Date Fair Value per Unit |  | Compensation Expense Year Ended September 30,
| 2016 |  | 2015 |  | 2014
|  |  |  |  |  |  |  | (In millions)
November 2013 |  | September 2016 |  | 350,000 |  | $ | 19.64 |  |  | $ | 4.4 |  |  | $ | 5.2 |  |  | $ | 2.6 |
November 2014 |  | September 2017 |  | 290,000 |  | 23.62 |  |  | 4.1 |  |  | 3.4 |  |  | — |
November 2015 |  | September 2018 |  | 330,000 |  | 30.81 |  |  | 4.0 |  |  | — |  |  | — |
|  |  |  |  |  |  |  | $ | 12.5 |  |  | $ | 8.6 |  |  | $ | 2.6 |
Additional information related to time-based RSU activity | The following table provides additional information related to time-based RSU activity during fiscal 2016 and 2015.
| Year Ended September 30,
| 2016 |  | 2015
| 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 | 1,978,262 |  |  | $ | 25.60 |  |  | 26,668 |  |  | $ | 21.49 |
Granted | 2,117,330 |  |  | 23.14 |  |  | 2,036,900 |  |  | 26.02 |
Vested | (423,427 | ) |  | 25.57 |  |  | (12,221 | ) |  | 21.48 |
Cancelled | (193,932 | ) |  | 25.05 |  |  | (73,085 | ) |  | 26.06 |
Outstanding at end of year | 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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&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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