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Stockholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2015
Dividends Declared and Paid |
|  | Year Ended September 30,
|  | 2015 |  | 2014 |  | 2013
Dividends declared and paid |  | $ | 24,646 |  | $ | 21,263 |  | $ | 21,866
Dividend per share amount |  |  | 0.38 |  |  | 0.32 |  |  | 0.32
Stock-based Compensation Expense Recognized |
|  | Year Ended September 30,
|  | 2015 |  | 2014 |  | 2013
Employee stock-based compensation expense |  | $ | 14,255 |  | $ | 11,241 |  | $ | 9,414
Stock Options [Member] |
Schedule of Assumptions Used in Estimate of Fair Value of Stock Option Awards |
| Year Ended September 30,
| 2015 |  | 2014 |  | 2013
Expected term (years) |  | 6.2 | - | 8.8 |  |  | 5.8 | - | 8.6 |  |  | 5.8 | - | 8.6 |
Estimated volatility |  | 36.5% |  |  | 38.5% |  |  | 48.7% | - | 54.9% |
Estimated dividend yield |  | 0.7% |  |  | 0.8% |  |  | 0.8% | - | 1.0% |
Risk-free interest rate |  | 2.0% | - | 2.3% |  |  | 1.7% | - | 2.5% |  |  | 0.8% | - | 1.3% |
Weighted Average Grant Date Fair Value of Options Granted |
|  | Year Ended September 30,
|  | 2015 |  | 2014 |  | 2013
Weighted-average grant date fair value of options |  | $ | 17.02 |  | $ | 15.63 |  | $ | 15.84
Activity for Stock Option Awards |
|  | Number |  | Weighted-Average Exercise Price
Balance at September 30, 2014 |  |  | 4,501 |  | $ | 28.08
Options granted |  |  | 751 |  |  | 46.55
Options exercised |  |  | (568) |  |  | 17.48
Options forfeited |  |  | (43) |  |  | 38.24
Balance at September 30, 2015 |  |  | 4,641 |  |  | 32.28
Changes in Nonvested Stock Options |
|  | Number |  | Weighted-Average Exercise Price
Balance at September 30, 2014 |  |  | 1,679 |  | $ | 34.83
Options granted |  |  | 751 |  |  | 46.55
Options vested |  |  | (664) |  |  | 33.07
Options forfeited |  |  | (42) |  |  | 38.24
Balance at September 30, 2015 |  |  | 1,724 |  |  | 40.54
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 |  |  | 4,641 |  | $ | 32.28 |  |  | 5.7 |  | $ | 43,646
Options vested and exercisable |  |  | 2,917 |  |  | 27.40 |  |  | 4.3 |  |  | 38,880
Options vested and expected to vest |  |  | 4,564 |  |  | 32.08 |  |  | 5.6 |  |  | 43,595
Other Stock Option Information |
|  | Year Ended September 30,
|  | 2015 |  | 2014 |  | 2013
Total fair value of stock options vested |  | $ | 9,656 |  | $ | 9,459 |  | $ | 7,271
Total intrinsic value of options exercised |  |  | 18,876 |  |  | 14,549 |  |  | 19,692
Cash received from exercises of stock options |  |  | 8,400 |  |  | 9,772 |  |  | 8,272
Excess tax benefit realized from exercise of stock options |  |  | 6,959 |  |  | 3,751 |  |  | 5,154
Restricted Stock Award [Member] |
Activity for Stock Option Awards |
|  | Number |  | Fair Value per Share
Balance at September 30, 2014 |  |  | 24 |  | $ | 39.43
Shares granted |  |  | - |  |  | n/a
Shares vested |  |  | - |  |  | n/a
Shares forfeited |  |  | - |  |  | n/a
Balance at September 30, 2015 |  |  | 24 |  |  | 39.43

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