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Stock-based Compensation (Tables) | 12 Months Ended
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Sep. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Restricted Stock and Restricted Stock Unit Activity | Fiscal 2020 activity of restricted stock units subject to performance and/or market conditions is presented below:
|  | Units |  |  | Weighted Average Grant Date Fair Value Per Unit |
Nonvested at September 30, 2019 |  |  | 263,910 |  |  | $ | 73.20 |
Granted |  |  | 91,662 |  |  | $ | 76.19 |
Vested |  |  | (86,287 | ) |  | $ | 58.68 |
Forfeited |  |  | (9,341 | ) |  | $ | 79.34 |
Nonvested at September 30, 2020 |  |  | 259,944 |  |  | $ | 78.92 |
Time-vested restricted stock and stock unit activity for fiscal 2020 is presented below:
|  | Shares/ Units |  |  | Weighted Average Grant Date Fair Value Per Share |
Nonvested at September 30, 2019 |  |  | 96,277 |  |  | $ | 72.83 |
Granted |  |  | 33,350 |  |  | $ | 76.13 |
Vested |  |  | (32,326 | ) |  | $ | 65.28 |
Forfeited |  |  | (3,628 | ) |  | $ | 76.94 |
Nonvested at September 30, 2020 |  |  | 93,673 |  |  | $ | 76.45 |
Significant Assumptions Used in the Monte Carlo simulations | The significant assumptions used in the Monte Carlo simulations are as follows:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Risk-free interest rate |  | 1.57% |  |  | 2.88% |  |  | 1.76% |
Expected dividend yield of stock |  |  | — |  |  |  | — |  |  |  | — |
Expected volatility of stock |  | 16.8% |  |  | 17.0% |  |  | 16.0% |
Vesting period |  | 3.0 years |  |  | 3.0 years |  |  | 2.9 years |
Compensation Cost Recognized for Share-based Compensation Arrangements | The amounts of compensation cost recognized for share-based compensation arrangements are presented below:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Total compensation cost |  | $ | 9.4 |  |  | $ | 8.6 |  |  | $ | 6.9 |
Compensation cost capitalized |  |  | (0.6 | ) |  |  | (1.4 | ) |  |  | (1.3 | )
Prior period disallowed stock compensation capitalization |  |  | — |  |  |  | — |  |  |  | 6.9 |
Compensation cost recognized in net income |  |  | 8.8 |  |  |  | 7.2 |  |  |  | 12.5 |
Income tax benefit recognized in net income |  |  | (2.1 | ) |  |  | (1.7 | ) |  |  | (4.0 | )
Compensation cost recognized in net income, net of income tax |  | $ | 6.7 |  |  | $ | 5.5 |  |  | $ | 8.5 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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