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Stockholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2017
Stockholders' Equity and Stock-Based Compensation [Abstract] |
Dividends Declared and Paid |
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﻿ |  | Year Ended September 30,
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Dividends declared and paid |  | $ | 29,745 |  | $ | 26,606 |  | $ | 24,646
﻿Dividend per share amount |  |  | 0.485 |  |  | 0.430 |  |  | 0.380
﻿
Stock-based Compensation Expense Recognized |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Year Ended September 30,
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Employee stock-based compensation expense |  | $ | 17,282 |  | $ | 15,122 |  | $ | 14,255
﻿
Weighted Average Grant Date Fair Value of Options Granted |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Year Ended September 30,
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Weighted-average grant date fair value of options |  | $ | 24.98 |  | $ | 13.39 |  | $ | 17.02
﻿
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | Year Ended September 30,
﻿ | 2017 |  | 2016 |  | 2015
﻿Weighted-average exercise price per share |  | 62.74 |  |  | 40.26 |  |  | 46.55 |
﻿Weighted-average grant date market value of Woodward stock |  | 69.45 |  |  | 40.26 |  |  | 46.55 |
﻿Expected term (years) |  | 6.0 | - | 8.7 |  |  | 6.3 | - | 8.7 |  |  | 6.2 | - | 8.8 |
﻿Estimated volatility |  | 30.6% | - | 33.7% |  |  | 34.5% |  | 35.1% |  |  | 36.5% |
﻿Estimated dividend yield |  | 0.7% |  |  | 1.0% |  |  | 0.7% |
﻿Risk-free interest rate |  | 2.0% | - | 2.5% |  |  | 1.7% | - | 2.0% |  |  | 2.0% | - | 2.3% |
﻿
Activity for Stock Option Awards |
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﻿ |  |  |  |  |  |
﻿ |  | Number |  | Weighted-Average Exercise Price Per Share
﻿Balance at September 30, 2016 |  |  | 4,944 |  | $ | 35.35
﻿Options granted |  |  | 791 |  |  | 62.74
﻿Options exercised |  |  | (466) |  |  | 33.65
﻿Options forfeited |  |  | (33) |  |  | 44.21
﻿Balance at September 30, 2017 |  |  | 5,236 |  |  | 39.58
﻿
Changes in Nonvested Stock Options |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿ |  | Number |  | Weighted-Average Grant Date Fair Value Per Share
﻿Balance at September 30, 2016 |  |  | 2,075 |  | $ | 14.90
﻿Options granted |  |  | 791 |  |  | 24.98
﻿Options vested |  |  | (763) |  |  | 15.26
﻿Options forfeited |  |  | (31) |  |  | 15.40
﻿Balance at September 30, 2017 |  |  | 2,072 |  |  | 18.61
﻿
Stock Options Vested, Or Expected to Vest and Are Exercisable |
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﻿ |  | Number |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Life in Years |  | Aggregate Intrinsic Value
﻿Options outstanding |  |  | 5,236 |  | $ | 39.58 |  |  | 5.9 |  | $ | 199,098
﻿Options vested and exercisable |  |  | 3,164 |  |  | 32.80 |  |  | 4.5 |  |  | 141,785
﻿Options vested and expected to vest |  |  | 5,164 |  |  | 39.39 |  |  | 5.9 |  |  | 197,348
﻿
Other Stock Option Information |
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﻿ |  | Year Ended September 30,
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Total fair value of stock options vested |  | $ | 11,639 |  | $ | 10,374 |  | $ | 9,656
﻿Total intrinsic value of options exercised |  |  | 16,416 |  |  | 23,178 |  |  | 18,876
﻿Cash received from exercises of stock options |  |  | 14,196 |  |  | 15,892 |  |  | 8,400
﻿Excess tax benefit realized from exercise of stock options |  |  | 4,383 |  |  | 6,472 |  |  | 6,959
﻿
Changes in Restricted Stock Awards |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿ |  | Number |  | Fair Value per Share
﻿Balance at September 30, 2016 |  |  | 24 |  | $ | 39.43
﻿Shares granted |  |  | - |  |  | n/a
﻿Shares vested |  |  | - |  |  | n/a
﻿Shares forfeited |  |  | (24) |  |  | 39.43
﻿Balance at September 30, 2017 |  |  | - |  |  | n/a
﻿

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