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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2024
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | Financial assets (liabilities) measured at fair value on a recurring basis as of March 31, 2024 and September 30, 2023, are summarized in the following tables by the type of inputs applicable to the fair value measurements:
| March 31, 2024
|  |  | Total Fair Value |  |  | Quoted Prices (Level 1) |  |  | Significant Unobservable Inputs (Level 3)
Equity securities |  | $ | 13,048 |  |  | $ | 13,048 |  |  | $ | — |
Debt securities classified as trading securities |  |  | 4,444 |  |  |  | 4,444 |  |  |  | — |
Executive savings plan assets |  |  | 925 |  |  |  | 925 |  |  |  | — |
Executive savings plan liabilities |  |  | (793) |  |  |  | (793) |  |  |  | — |
Total |  | $ | 17,624 |  |  | $ | 17,624 |  |  | $ | — |
| September 30, 2023
|  |  | Total Fair Value |  |  | Quoted Prices (Level 1) |  |  | Significant Unobservable Inputs (Level 3)
Executive savings plan assets |  | $ | 783 |  |  | $ | 783 |  |  | $ | — |
Executive savings plan liabilities |  |  | (657) |  |  |  | (657) |  |  |  | — |
Contingent consideration liability |  |  | (4,465) |  |  |  | — |  |  |  | (4,465) |
Total |  | $ | (4,339) |  |  | $ | 126 |  |  | $ | (4,465) |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation | The table below presents the change in fair value of this obligation, which used significant unobservable inputs (Level 3). This obligation was settled during the six months ended March 31, 2024, and we did not have any other assets or liabilities measured using significant unobservable inputs at March 31, 2024.
|  |  | Contingent Consideration Agreements |  |
Fair value at September 30, 2023 |  |  | $ | (4,465) |  |  |
Net adjustments to fair value |  |  | (35) |  |  |
Settlements |  |  | 4,500 |  |  |
Fair value at March 31, 2024 |  |  | $ | — |  |  |
Unrealized Gain (Loss) on Investments | Our unrealized net gains (losses), which are calculated as total net gains (losses) recognized during the period less net gains (losses) recognized on securities sold during the period, were as follows:
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2024 |  | 2023 |  | 2024 |  | 2023
Unrealized loss on equity securities | $ | (1,852) |  |  | $ | — |  |  | $ | (1,852) |  |  | $ | — |
Unrealized gain (loss) on debt securities | (57) |  |  | — |  |  | 62 |  |  | — |
Total unrealized loss on trading securities | $ | (1,909) |  |  | $ | — |  |  | $ | (1,790) |  |  | $ | — |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
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