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Note 14 - Stock Based Compensation (Tables) | 12 Months Ended
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Sep. 30, 2025
Notes Tables |
Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Restricted stock units |  | $ | 18,886 |  |  | $ | 12,505 |  |  | $ | 7,446 |
Employee stock purchase plan |  |  | 963 |  |  |  | 1,245 |  |  |  | 1,345 |
Total stock-based compensation expense for continuing operations |  | $ | 19,849 |  |  | $ | 13,750 |  |  | $ | 8,791 |
Income tax benefit |  |  | (3,374 | ) |  |  | (1,925 | ) |  |  | (1,319 | )
Total compensation expense included in the statement of operations |  | $ | 16,475 |  |  | $ | 11,825 |  |  | $ | 7,472 |
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |
|  | Shares |  |  | Grant Date |
|  | (in thousands) |  |  | Fair Value |
Unvested as of September 30, 2024 |  |  | 764,111 |  |  | $ | 59.65 |
Granted |  |  | 641,843 |  |  | $ | 45.00 |
Vested |  |  | (208,178 | ) |  | $ | 58.75 |
Forfeited |  |  | (167,942 | ) |  | $ | 68.77 |
Unvested as of September 30, 2025 |  |  | 1,029,834 |  |  | $ | 49.29 |
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Time-based restricted stock units |  |  | 448,375 |  |  |  | 282,268 |  |  |  | 311,609 |
Performance-based restricted stock units |  |  | 193,468 |  |  |  | 383,625 |  |  |  | 278,457 |
Total units |  |  | 641,843 |  |  |  | 665,893 |  |  |  | 590,066 |
Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] |
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Risk-free interest rate |  |  | 4.6 | % |  |  | 5.3 | % |  |  | 5.2 | %
Volatility |  |  | 41 | % |  |  | 47 | % |  |  | 57 | %
Expected life |  |  | 6 months |  |  |  | 6 months |  |  |  | 6 months |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(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 employee stock purchase plans, including, but not limited to: (a) expected term, (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://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 50 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/718-50/tableOfContent Reference 2: 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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