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Stock-based Compensation Plans (Tables) | 9 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Share-based Payment Arrangement, Activity [Table Text Block] | Grants issued during the nine months ended June 30, 2024 are as follows:
| Number granted |  | Weighted average grant date fair value per instrument |  | Total grant date fair value (in millions)
Quarter ended December 31, 2023 |  |  |  |  |
MRSUs | 136,983 |  |  | $ | 18.11 |  |  | $ | 2.5 |
PRSUs | 136,983 |  |  | 13.22 |  |  | 1.8 |
Restricted stock units | 161,943 |  |  | 13.27 |  |  | 2.1 |
Phantom Plan instruments | 230,523 |  |  | 13.22 |  |  | 3.0 |
Non-qualified stock options | 457,356 |  |  | 3.96 |  |  | 1.8 |
Employee stock purchase plan instruments | 31,139 |  |  | $ | 3.48 |  |  | 0.1 |
Total - Quarter ended December 31, 2023 |  |  |  |  | $ | 11.3 |
Quarter ended March 31, 2024 |  |  |  |  |
Restricted stock units | 81,136 |  |  | $ | 15.59 |  |  | $ | 1.3 |
Phantom Plan instruments | 2,544 |  |  | 15.71 |  |  | — |
Employee stock purchase plan instruments | 35,998 |  |  | $ | 2.62 |  |  | 0.1 |
Total - Quarter ended March 31, 2024 |  |  |  |  | 1.4 |
Quarter ended June 30, 2024 |  |  |  |  |
Restricted stock units | 55,572 |  |  | $ | 18.44 |  |  | $ | 1.0 |
Phantom Plan instruments | 3,183 |  |  | 15.70 |  |  | — |
Employee stock purchase plan instruments | 31,659 |  |  | $ | 3.01 |  |  | 0.1 |
Total - Quarter ended June 30, 2024 |  |  |  |  | 1.1 |
Total - Year to date ended June 30, 2024 |  |  |  |  | $ | 13.8 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The assumptions used to determine the grant date fair value are indicated below for awards granted to date during the current fiscal year.
|  | November 28, 2023
Variables used in determining grant date fair value: |  |
Dividend yield |  | 2.00%
Risk-free rate |  | 4.50%
Expected term (in years) |  | 2.84
The assumptions used to determine the grant date fair value are indicated below for awards granted to date during the current fiscal year.
| November 28, 2023
Variables used in determining grant date fair value: |
Dividend yield | 1.94%
Risk-free rate | 4.33%
Expected term (in years) | 6.00

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -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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