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Stockholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Dividends Declared and Paid |
|  | Year Ended September 30,
|  | 2019 |  | 2018 |  | 2017
Dividends declared and paid |  | $ | 39,066 |  | $ | 34,003 |  | $ | 29,745
Dividend per share amount |  |  | 0.6300 |  |  | 0.5525 |  |  | 0.4850
Stock-based Compensation Expense Recognized |
|  | Year Ended September 30,
|  | 2019 |  | 2018 |  | 2017
Employee stock-based compensation expense |  | $ | 18,146 |  | $ | 18,229 |  | $ | 17,282
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Assumptions Used in Estimate of Fair Value of Stock Option Awards |
| Year Ended September 30,
| 2019 |  | 2018 |  | 2017
Weighted-average exercise price per share | $ | 79.84 |  |  | 78.91 |  |  | 62.74 |
Weighted-average grant date market value of Woodward stock | $ | 79.84 |  |  | 78.91 |  |  | 69.45 |
Expected term (years) |  | 6.5 | - | 8.7 |  |  | 6.4 | - | 8.7 |  |  | 6.0 | - | 8.7 |
Estimated volatility |  | 25.7% | - | 31.0% |  |  | 29.1% | - | 32.7% |  |  | 30.6% | - | 33.7% |
Estimated dividend yield |  | 0.6% | - | 0.8% |  |  | 0.6% |  | 0.8% |  |  | 0.7% |
Risk-free interest rate |  | 1.5% | - | 3.1% |  |  | 2.1% | - | 2.8% |  |  | 2.0% | - | 2.5% |
Weighted Average Grant Date Fair Value of Options Granted |
|  | Year Ended September 30,
|  | 2019 |  | 2018 |  | 2017
Weighted-average grant date fair value of options |  | $ | 24.12 |  | $ | 25.66 |  | $ | 24.98
Summary of Activity for Stock Option Awards |
|  | Number |  | Weighted-Average Exercise Price Per Share
Balance at September 30, 2018 |  |  | 5,611 |  | $ | 45.42
Options granted |  |  | 924 |  |  | 79.84
Options exercised |  |  | (1,102) |  |  | 32.71
Options forfeited |  |  | (44) |  |  | 68.51
Options expired |  |  | (2) |  |  | 72.58
Balance at September 30, 2019 |  |  | 5,387 |  |  | 53.73
Changes in Non-vested Stock Options |
|  | Number |  | Weighted-Average Grant Date Fair Value Per Share
Balance at September 30, 2018 |  |  | 1,988 |  | $ | 21.64
Options granted |  |  | 924 |  |  | 24.12
Options vested |  |  | (800) |  |  | 19.81
Options forfeited |  |  | (44) |  |  | 22.91
Balance at September 30, 2019 |  |  | 2,068 |  |  | 23.43
Stock Options Vested, or Expected to Vest and Exercisable |
|  | Number |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Life in Years |  | Aggregate Intrinsic Value
Options outstanding |  |  | 5,387 |  | $ | 53.73 |  |  | 5.9 |  | $ | 291,465
Options vested and exercisable |  |  | 3,320 |  |  | 42.43 |  |  | 4.5 |  |  | 217,114
Options vested and expected to vest |  |  | 5,297 |  |  | 53.30 |  |  | 5.8 |  |  | 288,839
Other Stock Option Information |
|  | Year Ended September 30,
|  | 2019 |  | 2018 |  | 2017
Total fair value of stock options vested |  | $ | 15,863 |  | $ | 13,944 |  | $ | 11,639
Total intrinsic value of options exercised |  |  | 70,866 |  |  | 16,690 |  |  | 16,416
Cash received from exercises of stock options |  |  | 36,044 |  |  | 9,132 |  |  | 14,196
Excess tax benefit realized from exercise of stock options |  |  | 13,416 |  |  | 3,524 |  |  | 4,383
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Activity for Restricted Stock Units |
|  |  | Number |  | Weighted-Average Grant Date Fair Value per Unit
Balance at September 30, 2018 |  |  | 10 |  | $ | 82.71
Units granted |  |  | 4 |  |  | 102.94
Units vested |  |  | (5) |  |  | 82.71
Units forfeited |  |  | - |  |  | n/a
Balance at September 30, 2019 |  |  | 9 |  |  | 91.55

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