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Stockholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2014
Stockholders' Equity |
Summary of share repurchase activity |
Fiscal Year Period |  | Total Number of Shares Purchased |  | Average Price Paid per Share |  | Total Cash Paid for Shares Purchased |  | Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs(1) |
2009 |  |  | 707,462 |  | $ | 5.50 |  | $ | 3,874,000 |  | $ | 6,126,000 |
2010 |  |  | 1,225,019 |  | $ | 11.53 |  |  | 14,471,000 |  |  | 1,655,000 |
2011 |  |  | 229,575 |  | $ | 15.39 |  |  | 3,541,000 |  |  | 18,114,000 |
2012 |  |  | 505,067 |  | $ | 59.41 |  |  | 30,000,000 |  |  | 18,114,000 |
2013 |  |  | — |  |  | — |  |  | — |  |  | 31,000,000 |
2014 |  |  | 2,962,978 |  | $ | 15.90 |  | $ | 44,873,000 |  | $ | 5,127,000 |
(1) | On December 2, 2008, the Company's Board of Directors approved a share repurchase program, under which the Company was authorized to repurchase up to $10.0 million of the issued and outstanding shares of Company common stock. On each of February 2, 2010, November 30, 2010 and May 31, 2011, the Company's Board of Directors approved an additional $10.0 million for the share repurchase program. On May 17, 2012, the Company's Board of Directors approved an additional $30.0 million for the share repurchase program. On December 12, 2013, the Company's Board of Directors approved an additional approximately $12.9 million for the share repurchase program. On February 5, 2014, the Company's Board of Directors approved an additional $19.0 million for the share repurchase program.
Summary of stock option activity |
|  | Options |  | Weighted- Average Exercise Price |
Options outstanding at September 30, 2011 |  |  | 2,894,547 |  | $ | 11.55 |
Options granted |  |  | 181,783 |  |  | 34.42 |
Options exercised |  |  | (1,322,387 | ) |  | 11.72 |
Options canceled |  |  | (78,148 | ) |  | 12.72 |
Options outstanding at September 30, 2012 |  |  | 1,675,795 |  |  | 13.84 |
Options granted |  |  | 171,994 |  |  | 35.76 |
Options exercised |  |  | (223,139 | ) |  | 11.35 |
Options canceled |  |  | (32,244 | ) |  | 18.67 |
Options outstanding at September 30, 2013 |  |  | 1,592,406 |  |  | 16.46 |
Options granted |  |  | 437,755 |  |  | 22.41 |
Options exercised |  |  | (383,160 | ) |  | 10.83 |
Options canceled |  |  | (181,094 | ) |  | 18.14 |
Options outstanding at September 30, 2014 |  |  | 1,465,907 |  |  | 19.50 |
Options exercisable at September 30, 2014 |  |  | 890,103 |  |  | 16.15 |
Summary of information about options outstanding and exercisable | The following table summarizes information about options outstanding at September 30, 2014:
|  | Options Outstanding |
Range of Exercise Price |  | Number Outstanding |  | Weighted- Average Remaining Contractual Life |  | Weighted- Average Exercise Price |
$3.00 - 8.00 |  |  | 148,448 |  |  | 4.20 |  | $ | 7.38 |
$8.23 - $46.72 |  |  | 1,317,459 |  |  | 6.52 |  |  | 20.87 |
|  |  | 1,465,907 |  |  | 6.10 |  |  | 19.50 |
The following table summarizes information about options exercisable at September 30, 2014:
|  | Options Exercisable |
Range of Exercise Price |  | Number Exercisable |  | Weighted- Average Remaining Contractual Life |  | Weighted- Average Exercise Price |
$3.00 - $46.72 |  |  | 890,103 |  |  | 4.38 |  | $ | 16.15 |
Summary of information about assumptions used in valuing options granted |
|  | Year ended September 30 |
|  | 2014 |  | 2013 |  | 2012 |
Dividend yield |  |  | — |  |  | — |  |  | — |
Expected volatility |  |  | 50.9% - 60.6% |  |  | 51.8% - 60.6% |  |  | 60.4 | %
Risk-free interest rate |  |  | 0.1% - 1.2% |  |  | 0.1% - 1.0% |  |  | 0.6 | %
Expected forfeiture rate |  |  | 19.7% - 22.8% |  |  | 19.7% |  |  | 19.0 | %
Summary of restricted share activity |
|  | Restricted Shares |  | Weighted- Average Fair Value |
Unvested restricted shares at September 30, 2011 |  |  | 1,294,082 |  | $ | 13.13 |
Restricted shares granted |  |  | 633,647 |  |  | 34.05 |
Restricted shares vested |  |  | (390,068 | ) |  | 12.53 |
Restricted shares canceled |  |  | (138,052 | ) |  | 15.70 |
Unvested restricted shares at September 30, 2012 |  |  | 1,399,609 |  |  | 22.51 |
Restricted shares granted |  |  | 997,857 |  |  | 36.97 |
Restricted shares vested |  |  | (450,514 | ) |  | 21.18 |
Restricted shares canceled |  |  | (403,083 | ) |  | 35.39 |
Unvested restricted shares at September 30, 2013 |  |  | 1,543,869 |  |  | 28.89 |
Restricted shares granted |  |  | 1,040,748 |  |  | 18.78 |
Restricted shares vested |  |  | (436,204 | ) |  | 24.72 |
Restricted shares canceled |  |  | (250,586 | ) |  | 23.87 |
Unvested restricted shares at September 30, 2014 |  |  | 1,897,827 |  |  | 24.96 |

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