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v3.25.3

Stock-based Compensation Plans (Tables) | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Share-Based Payment Arrangement [Abstract] |  |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | Restricted stock unit activity under the 2006 Plan is summarized below:
| Restricted stock units |  | Weighted average grant date fair value per unit
Outstanding as of September 30, 2022 | 358,732 |  |  | $ | 12.77 |
Granted | 625,518 |  |  | 12.78 |
Vested | (301,864) |  |  | 12.83 |
Cancelled | (109,103) |  |  | 12.00 |
Outstanding as of September 30, 2023 | 573,283 |  |  | 12.88 |
Granted | 301,908 |  |  | 14.91 |
Vested | (367,315) |  |  | 12.99 |
Cancelled | (54,080) |  |  | 12.85 |
Outstanding as of September 30, 2024 | 453,796 |  |  | 14.15 |
Granted | 194,334 |  |  | 26.13 |
Vested | (283,026) |  |  | 13.81 |
Cancelled | (10,770) |  |  | 18.55 |
Outstanding as of September 30, 2025 | 354,334 |  |  | $ | 20.85 |
Schedule of Nonvested Performance-based Units Activity [Table Text Block] | Stock-settled PRSUs activity under the 2006 Plan is summarized below:
Award date |  | Settlement year |  | Performance period |  | Grant date per unit fair value |  | Units awarded |  | Units forfeited |  | Net units |  | Performance factor |  | Shares earned
December 3, 2019 |  | 2023 |  | 2020 |  | $ | 11.26 |  |  | 69,988 |  |  | (2,391) |  |  | 67,597 |  |  | 0.909 |  | 61,446 |
|  |  |  | 2021 |  | 11.86 |  |  | 69,989 |  |  | (9,614) |  |  | 60,375 |  |  | 1.161 |  | 70,096 |
|  |  |  | 2022 |  | 13.81 |  |  | 69,988 |  |  | (9,614) |  |  | 60,374 |  |  | 0.700 |  | 42,262 |
November 29, 2022 |  | 2026 |  | 2023-2025 |  | 11.41 |  |  | 166,284 |  |  | (92,550) |  |  | 73,734 |  |  | 2.000 |  | 147,468 |
November 28, 2023 |  | 2027 |  | 2024-2026 |  | 13.22 |  |  | 136,983 |  |  | (30,804) |  |  | 106,179 |  |  | — |  | — |
December 3, 2024 |  | 2028 |  | 2025-2027 |  | 25.58 |  |  | 64,044 |  |  | (1,308) |  |  | 62,736 |  |  | — |  | — |
March 3, 2025 |  | 2028 |  | 2025-2027 |  | $ | 25.19 |  |  | 7,692 |  |  | — |  |  | 7,692 |  |  | — |  | —
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The table below provides information regarding MRSU awards for grants issued during our 2025 fiscal year, which were valued using Monte Carlo simulations on the grant date:
| March 3, 2025 |  | December 3, 2024
Fair value at grant date | $41.24 |  | $38.25
Units granted | 7,692 |  | 64,044
Variables used in determining grant date fair value: |  |  |
Dividend yield | 1.1 | % |  | 1.1 | %
Expected volatility | 31.0 | % |  | 29.8 | %
Risk-free rate | 3.9 | % |  | 4.1 | %
Expected term (in years) | 2.60 |  | 2.80
The assumptions used to determine the grant date fair value are indicated below for grants issued during our 2025 fiscal year:
| March 3, 2025 |  | December 3, 2024
Variables used in determining grant date fair value: |  |  |
Dividend yield | 1.4 | % |  | 1.6 | %
Expected volatility | 36.3 | % |  | 29.9 | %
Risk-free rate | 4.0 | % |  | 4.1 | %
Expected term (in years) | 6.00 |  | 6.00
Schedule of Share-based Compensation. Options | Stock option activity under the 2006 Plan is summarized below:
| Options |  | Weighted average exercise price per option |  | Weighted average remaining contractual term (years) |  | Aggregate intrinsic value (millions)
Outstanding as of September 30, 2022 | 1,013,293 |  |  | $ | 12.19 |  |  | 7.7 |  | $ | 0.3 |
Granted | 573,279 |  |  | 11.41 |  |  |  |  |
Exercised | (131,989) |  |  | 9.59 |  |  |  |  | 0.4 |
Cancelled | (327,115) |  |  | 12.16 |  |  |  |  |
Outstanding as of September 30, 2023 | 1,127,468 |  |  | 12.10 |  |  | 7.8 |  | $ | 1.0 |
Granted | 457,356 |  |  | 13.22 |  |  |  |  |
Exercised | (517,839) |  |  | 12.05 |  |  |  |  | 5.0 |
Cancelled | (135,215) |  |  | 12.69 |  |  |  |  |
Outstanding as of September 30, 2024 | 931,770 |  |  | 12.60 |  |  | 7.9 |  | $ | 8.5 |
Granted | 228,615 |  |  | 25.54 |  |  |  |  |
Exercised | (246,577) |  |  | 12.33 |  |  |  |  | 3.3 |
Cancelled | (5,604) |  |  | 19.45 |  |  |  |  |
Outstanding as of September 30, 2025 | 908,204 |  |  | $ | 15.89 |  |  | 7.8 |  | $ | 8.8 |
Exercisable as of September 30, 2025 | 374,295 |  |  | $ | 12.60 |  |  | 6.8 |  | $ | 4.8 |
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |  | The ranges of exercise prices for stock options outstanding as of September 30, 2025 are summarized below:
Exercise price |  | Outstanding Options |  | Weighted average exercise price |  | Weighted average remaining contractual term (years) |  | Exercisable options |  | Weighted average exercise price
| $ | 10.00 |  | - | $ | 14.99 |  |  |  | 682,415 |  |  | $ | 12.70 |  |  | 7.3 |  | 374,295 |  |  | $ | 12.60 |
| $ | 25.00 |  | - | $ | 29.99 |  |  |  | 225,789 |  |  | 25.54 |  |  | 9.2 |  | — |  |  | — |
|  |  |  |  |  | 908,204 |  |  | $ | 15.89 |  |  |  |  | 374,295 |  |  | $ | 12.60 |
Schedule of Share-based Compensation, Phantom Award, Activity | Phantom Plan activity is summarized below:
| Phantom Plan units |  | Weighted average grant date fair value per unit |  | Aggregate intrinsic value (millions)
Outstanding as of September 30, 2022 | 339,131 |  |  | $ | 12.74 |  |  |
Granted | 294,063 |  |  | 11.53 |  |  |
Vested | (156,012) |  |  |  |  | $ | 0.1 |
Cancelled | (120,515) |  |  | 12.22 |  |  |
Outstanding as of September 30, 2023 | 356,667 |  |  | 12.09 |  |  |
Granted | 236,250 |  |  | 13.28 |  |  |
Vested | (156,585) |  |  |  |  | $ | 1.5 |
Cancelled | (20,952) |  |  | 12.53 |  |  |
Outstanding as of September 30, 2024 | 415,380 |  |  | 12.71 |  |  |
Granted | 143,589 |  |  | 25.61 |  |  |
Vested | (195,118) |  |  |  |  | $ | 2.5 |
Cancelled | (39,482) |  |  | 16.01 |  |  |
Outstanding as of September 30, 2025 | 324,369 |  |  | $ | 18.03 |  |  |

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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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