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Share-Based Compensation (Tables) | 12 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Share-based Payment Award, Stock options, Valuation Assumptions | Fair value is estimated at the grant date based on a Black-Scholes-Merton option-pricing model using the following weighted-average assumptions:
| Year Ended September 30,
| 2021 |  | 2020 (1) |  | 2019
Expected stock price volatility | 38 | % |  | — | % |  | 27 | %
Expected dividend yield | — | % |  | — | % |  | — | %
Risk free interest rate | 1.68 | % |  | — | % |  | 1.86 | %
Average expected life (in years) | 4.50 |  | 0.00 |  | 6.05
(1) There were no stock options granted under the plan during the year ended September 30, 2020.
Share-based Compensation, Stock Options, Activity | The following is a summary of stock option activity for the year ended September 30, 2021:
| Shares Available for Grant |  | Number of Options Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Term (in years) |  | Aggregate Intrinsic Value ($ millions)
Balances as of September 30, 2020 | 724,483 |  |  | 1,408,036 |  |  | $ | 38.79 |  |  | $ | 11.38 |  |  | 4.16 |  | $ | 17.4 |
Additional shares authorized by shareholders | 1,000,000 |  |  | — |  |  |  |  |  |  |  |  |
Granted | (277,700) |  |  | 277,700 |  |  | $ | 58.64 |  |  | $ | 19.83 |  |  |  |  |
Exercised | — |  |  | (333,121) |  |  | $ | 28.71 |  |  | $ | 12.74 |  |  |  |  |
Forfeited | 122,014 |  |  | (122,014) |  |  | $ | 47.13 |  |  | $ | 12.22 |  |  |  |  |
Expired | 1,001 |  |  | (1,001) |  |  | $ | 41.83 |  |  | $ | 9.04 |  |  |  |  |
Balances as of September 30, 2021 | 1,569,798 |  |  | 1,229,600 |  |  | $ | 45.17 |  |  | $ | 12.82 |  |  | 4.21 |  | $ | 25.5 |
Exercisable at September 30, 2021 |  |  | 237,040 |  |  | $ | 31.83 |  |  | $ | 11.94 |  |  | 0.56 |  | $ | 8.1 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range | The options outstanding as of September 30, 2021 broken down by exercise price are as follows:
Exercise Price |  | Number of Options Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Remaining Term (in Years)
$ | — |  | - | $ | 5.00 |  |  | — |  |  | n/a |  | n/a
$ | 5.00 |  | - | $ | 10.00 |  |  | — |  |  | n/a |  | n/a
$ | 10.00 |  | - | $ | 15.00 |  |  | — |  |  | n/a |  | n/a
$ | 15.00 |  | - | $ | 20.00 |  |  | — |  |  | n/a |  | n/a
$ | 20.00 |  | - | $ | 25.00 |  |  | — |  |  | n/a |  | n/a
$ | 25.00 |  | - | $ | 30.00 |  |  | 149,706 |  |  | $ | 25.91 |  |  | 0.37
$ | 30.00 |  | - | $ | 35.00 |  |  | — |  |  | n/a |  | n/a
$ | 35.00 |  | - | $ | 40.00 |  |  | 80,729 |  |  | $ | 39.79 |  |  | 1.37
$ | 40.00 |  | - | $ | 45.00 |  |  | 739,315 |  |  | $ | 44.94 |  |  | 4.92
$ | 45.00 |  | - | $ | 50.00 |  |  | — |  |  | n/a |  | n/a
$ | 50.00 |  | - | $ | 55.00 |  |  | — |  |  | n/a |  | n/a
$ | 55.00 |  | - | $ | 60.00 |  |  | 259,850 |  |  | $ | 58.61 |  |  | 5.27
|  |  |  | 1,229,600 |  |  | $ | 30.75 |  |  | 5.64
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | The following is a summary of restricted stock activity through September 30, 2021:
| Shares Available for Grant |  | Number of Shares Outstanding |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Term (in years) |  | Aggregate Intrinsic Value ($ millions)
Balances as of September 30, 2020 | 861,454 |  |  | 484,346 |  |  | $ | 42.97 |  |  | 1.37 |  | $ | 24.8 |
Granted | (307,204) |  |  | 307,204 |  |  | $ | 57.33 |  |  |  |  |
Vested | — |  |  | (210,461) |  |  | $ | 43.11 |  |  |  |  |
Forfeited | 4,048 |  |  | (4,048) |  |  | $ | 41.81 |  |  |  |  |
Balances as of September 30, 2021 | 558,298 |  |  | 577,041 |  |  | $ | 50.57 |  |  | 1.26 |  | $ | 38.0 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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