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Stock Plans (Tables) | 12 Months Ended
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Sep. 30, 2015
Stock Plans |
Schedule of stock option activity |
|  | Number of Options (in millions) |  | Weighted Average Exercise Price |
Balance, September 30, 2012 |  |  | 2.5 |  | $ | 22.81 |
Granted |  |  | — |  |  | — |
Exercised |  |  | (0.8 | ) |  | 18.31 |
Cancelled |  |  | (0.1 | ) |  | 26.83 |
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Balance, September 30, 2013 |  |  | 1.6 |  |  | 24.73 |
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Granted |  |  | 0.6 |  |  | 31.62 |
Exercised |  |  | (0.5 | ) |  | 23.64 |
Cancelled |  |  | (0.1 | ) |  | 26.87 |
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Balance, September 30, 2014 |  |  | 1.6 |  |  | 27.69 |
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Granted |  |  | — |  |  | — |
Exercised |  |  | (0.3 | ) |  | 24.98 |
Cancelled |  |  | — |  |  | — |
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Balance, September 30, 2015 |  |  | 1.3 |  |  | 28.26 |
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Exercisable as of September 30, 2013 |  |  | 1.4 |  |  | 24.51 |
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Exercisable as of September 30, 2014 |  |  | 0.9 |  |  | 25.16 |
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Exercisable as of September 30, 2015 |  |  | 0.7 |  |  | 25.04 |
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Summary of information concerning outstanding and exercisable options |
|  | Options Outstanding |  |  |  | Options Exercisable |
|  | Number Outstanding as of September 30, 2015 (in millions) |  | Weighted Average Remaining Contractual Life |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in millions) |  | Number Exercisable as of September 30, 2015 (in millions) |  | Weighted Average Remaining Contractual Life |  | Weighted Average Exercise Price |
Range of Exercise Prices |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$21.01 - $23.94 |  |  | 0.2 |  |  | 0.23 |  | $ | 23.19 |  | $ | 1.1 |  |  | 0.2 |  |  | 0.23 |  | $ | 23.19 |
24.45 - 27.67 |  |  | 0.4 |  |  | 1.47 |  |  | 25.43 |  |  | 0.9 |  |  | 0.4 |  |  | 1.47 |  |  | 25.43 |
28.04 - 31.62 |  |  | 0.7 |  |  | 7.67 |  |  | 31.25 |  |  | — |  |  | 0.1 |  |  | 2.01 |  |  | 28.53 |
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|  |  | 1.3 |  |  | 4.69 |  |  | 28.26 |  | $ | 2.0 |  |  | 0.7 |  |  | 1.10 |  |  | 25.04 |
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