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Note 3 - Stock-based Compensation (Tables) | 12 Months Ended
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Sep. 30, 2022
Notes Tables |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |
|  |  |  |  |  | Grant Date |
|  |  |  |  |  | Fair Value |
|  | Units |  |  | Per Unit |
Nonvested at September 30, 2021 |  |  | 312,596 |  |  | $ | 74.33 |
Granted |  |  | 128,396 |  |  | $ | 67.43 |
Vested |  |  | (91,111 | ) |  | $ | 79.40 |
Forfeited |  |  | (6,357 | ) |  | $ | 69.43 |
Nonvested at September 30, 2022 |  |  | 343,524 |  |  | $ | 70.14 |
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |
|  |  |  |  |  | Grant Date |
|  | Shares/ |  |  | Fair Value |
|  | Units |  |  | Per Share |
Nonvested at September 30, 2021 |  |  | 110,300 |  |  | $ | 70.98 |
Granted |  |  | 62,945 |  |  | $ | 63.57 |
Vested |  |  | (46,970 | ) |  | $ | 72.67 |
Forfeited |  |  | (4,030 | ) |  | $ | 68.62 |
Nonvested at September 30, 2022 |  |  | 122,245 |  |  | $ | 66.60 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Risk-free interest rate |  |  | 0.79% |  |  |  | 0.22% |  |  |  | 1.57% |
Expected dividend yield of stock |  |  | — |  |  |  | — |  |  |  | — |
Expected volatility of stock |  |  | 32.2% |  |  |  | 31.4% |  |  |  | 16.8% |
Vesting period (in years) |  |  | 3.0 |  |  |  | 3.0 |  |  |  | 3.0 |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Total compensation cost |  | $ | 7.5 |  |  | $ | 16.6 |  |  | $ | 9.4 |
Compensation cost capitalized |  |  | (1.1 | ) |  |  | (2.7 | ) |  |  | (0.6 | )
Compensation cost recognized in net income |  |  | 6.4 |  |  |  | 13.9 |  |  |  | 8.8 |
Income tax benefit recognized in net income |  |  | (1.5 | ) |  |  | (3.2 | ) |  |  | (2.1 | )
Compensation cost recognized in net income, net of income tax |  | $ | 4.9 |  |  | $ | 10.7 |  |  | $ | 6.7 |

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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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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