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Stockholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2014
Dividends Declared and Paid |
|  | Year Ended September 30,
|  | 2014 |  | 2013 |  | 2012
Dividends declared and paid |  | $ | 21,263 |  | $ | 21,866 |  | $ | 21,351
Dividend per share amount |  |  | 0.32 |  |  | 0.32 |  |  | 0.31
Stock-based Compensation Expense Recognized |
|  | Year Ended September 30,
|  | 2014 |  | 2013 |  | 2012
Employee stock-based compensation expense |  | $ | 11,241 |  | $ | 9,414 |  | $ | 8,628
Schedule of Assumptions Used in Estimate of Fair Value of Stock Option Awards |
| Year Ended September 30,
| 2014 |  | 2013 |  | 2012
Expected term (years) |  | 5.8 | - | 8.6 |  |  | 5.8 | - | 8.6 |  |  | 5.9 | - | 8.5 |
Estimated volatility |  | 38.5% |  |  | 48.7% | - | 54.9% |  |  | 48.9% | - | 55.6% |
Estimated dividend yield |  | 0.8% |  |  | 0.8% | - | 1.0% |  |  | 0.7% | - | 1.1% |
Risk-free interest rate |  | 1.7% | - | 2.5% |  |  | 0.8% | - | 1.3% |  |  | 0.8% | - | 1.6% |
Weighted Average Grant Date Fair Value of Options Granted |
|  | Year Ended September 30,
|  | 2014 |  | 2013 |  | 2012
Weighted-average grant date fair value of options |  | $ | 15.63 |  | $ | 15.84 |  | $ | 12.14
Activity for Stock Option Awards |
|  | Number |  | Weighted-Average Exercise Price
Balance at September 30, 2013 |  |  | 4,423 |  | $ | 25.06
Options granted |  |  | 694 |  |  | 40.99
Options exercised |  |  | (562) |  |  | 19.67
Options forfeited |  |  | (54) |  |  | 34.06
Balance at September 30, 2014 |  |  | 4,501 |  |  | 28.08
Stock Options Vested, Or Expected to Vest and Are Exercisable |
|  | Number |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Life in Years |  | Aggregate Intrinsic Value
Options outstanding |  |  | 4,501 |  | $ | 28.08 |  |  | 5.6 |  | $ | 87,923
Options vested and exercisable |  |  | 2,822 |  |  | 24.07 |  |  | 4.1 |  |  | 66,458
Options vested and expected to vest |  |  | 4,419 |  |  | 27.92 |  |  | 5.5 |  |  | 87,066
Other Stock Option Information |
|  | Year Ended September 30,
|  | 2014 |  | 2013 |  | 2012
Total fair value of stock options vested |  | $ | 9,459 |  | $ | 7,271 |  | $ | 5,907
Total intrinsic value of options exercised |  |  | 14,549 |  |  | 19,692 |  |  | 12,521
Cash received from exercises of stock options |  |  | 9,772 |  |  | 8,272 |  |  | 6,180
Excess tax benefit realized from exercise of stock options |  |  | 3,751 |  |  | 5,154 |  |  | 3,990
Stock Options [Member] |
Changes in Nonvested Stock Options |
|  | Number |  | Weighted-Average Exercise Price
Balance at September 30, 2013 |  |  | 1,737 |  | $ | 29.97
Options granted |  |  | 694 |  |  | 40.99
Options vested |  |  | (698) |  |  | 28.97
Options forfeited |  |  | (54) |  |  | 33.40
Balance at September 30, 2014 |  |  | 1,679 |  |  | 34.83
Restricted Stock Award [Member] |
Changes in Restricted Stock Awards |
|  | Number |  | Fair Value per Share
Balance at September 30, 2013 |  |  | - |  | $ | n/a
Shares granted |  |  | 24 |  |  | 39.43
Shares vested |  |  | - |  |  | n/a
Shares forfeited |  |  | - |  |  | n/a
Balance at September 30, 2014 |  |  | 24 |  |  | 39.43

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