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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Sep. 30, 2015
STOCK-BASED COMPENSATION |
Summary of compensation cost for stock-based payment arrangements recognized in general and administrative expense |
|  | September 30, |
|  | 2015 |  | 2014 |  | 2013 |
|  | (in thousands) |
Compensation expense |  |  |  |  |  |  |  |  |  |
Stock options |  | $ | 8,846 |  | $ | 11,268 |  | $ | 11,512 |
Restricted stock |  |  | 16,349 |  |  | 15,435 |  |  | 11,759 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 25,195 |  | $ | 26,703 |  | $ | 23,271 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Summary of weighted-average assumptions utilized in determining the fair value of options granted |
|  | 2015 |  | 2014 |  | 2013 |
Risk-free interest rate |  |  | 1.7 | % |  | 1.6 | % |  | 0.7 | %
Expected stock volatility |  |  | 36.9 | % |  | 52.6 | % |  | 53.9 | %
Dividend yield |  |  | 3.9 | % |  | 3.1 | % |  | 1.1 | %
Expected term (in years) |  |  | 5.5 |  |  | 5.5 |  |  | 5.5 |
Summary of stock option activity | The following summary reflects the stock option activity for our common stock and related information for fiscal 2015, 2014 and 2013 (shares in thousands):
|  | 2015 |  | 2014 |  | 2013 |
|  | Options |  | Weighted-Average Exercise Price |  | Options |  | Weighted-Average Exercise Price |  | Options |  | Weighted-Average Exercise Price |
Outstanding at October 1, |  |  | 2,629 |  | $ | 43.46 |  |  | 3,991 |  | $ | 34.12 |  |  | 4,690 |  | $ | 29.56 |
Granted |  |  | 420 |  |  | 68.83 |  |  | 261 |  |  | 79.67 |  |  | 365 |  |  | 54.18 |
Exercised |  |  | (255 | ) |  | 28.46 |  |  | (1,613 | ) |  | 26.08 |  |  | (1,057 | ) |  | 20.68 |
Forfeited/Expired |  |  | (18 | ) |  | 66.78 |  |  | (10 | ) |  | 68.82 |  |  | (7 | ) |  | 52.32 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding on September 30, |  |  | 2,776 |  | $ | 48.51 |  |  | 2,629 |  | $ | 43.46 |  |  | 3,991 |  | $ | 34.12 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable on September 30, |  |  | 2,014 |  | $ | 41.62 |  |  | 1,884 |  | $ | 35.93 |  |  | 3,063 |  | $ | 28.48 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Shares available to grant |  |  | 2,515 |  |  |  |  |  | 3,432 |  |  |  |  |  | 4,116 |  |  |  |
Summary of information about outstanding and exercisable stock options | The following table summarizes information about stock options at September 30, 2015 (shares in thousands):
|  | Outstanding Stock Options |  | Exercisable Stock Options |
Range of Exercise Prices |  | Options |  | Weighted-Average Remaining Life |  | Weighted-Average Exercise Price |  | Options |  | Weighted-Average Exercise Price |
$21.065 to $38.015 |  |  | 1,198 |  |  | 2.5 |  | $ | 30.13 |  |  | 1,197 |  | $ | 30.13 |
$47.29 to $59.76 |  |  | 911 |  |  | 6.3 |  | $ | 54.85 |  |  | 650 |  | $ | 54.25 |
$68.83 to $79.67 |  |  | 667 |  |  | 8.8 |  | $ | 72.85 |  |  | 167 |  | $ | 74.83 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
$21.065 to $79.67 |  |  | 2,776 |  |  | 5.3 |  | $ | 48.51 |  |  | 2,014 |  | $ | 41.62 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Summary of restricted stock awards and changes in restricted stock outstanding | A summary of the status of our restricted stock awards as of September 30, 2015, and of changes in restricted stock outstanding during the fiscal years ended September 30, 2015, 2014 and 2013, is as follows (shares in thousands):
|  | 2015 |  | 2014 |  | 2013 |
|  | Shares |  | Weighted-Average Grant Date Fair Value per Share |  | Shares |  | Weighted-Average Grant Date Fair Value per Share |  | Shares |  | Weighted-Average Grant Date Fair Value per Share |
Outstanding at October 1, |  |  | 634 |  | $ | 64.03 |  |  | 576 |  | $ | 55.17 |  |  | 430 |  | $ | 52.52 |
Granted |  |  | 275 |  |  | 68.83 |  |  | 230 |  |  | 79.67 |  |  | 307 |  |  | 54.18 |
Vested (1) |  |  | (214 | ) |  | 60.80 |  |  | (157 | ) |  | 54.08 |  |  | (155 | ) |  | 45.88 |
Forfeited |  |  | (27 | ) |  | 64.45 |  |  | (15 | ) |  | 67.92 |  |  | (6 | ) |  | 54.67 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding on September 30 |  |  | 668 |  | $ | 67.03 |  |  | 634 |  | $ | 64.03 |  |  | 576 |  | $ | 55.17 |
(1) | The number of restricted stock awards vested includes shares that we withheld on behalf of our employees to satisfy the statutory tax withholding requirements.

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