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Fair Value Measurements | 6 Months Ended
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Mar. 31, 2025
Fair Value Disclosures [Abstract] |
Fair Value Disclosures [Text Block] | . FAIR VALUE MEASUREMENTS Fair Value Measurement Accounting Fair value is considered the price to sell an asset, or transfer a liability, between market participants on the measurement date. Fair value measurements assume that (1) the asset or liability is exchanged in an orderly manner, (2) the exchange is in the principal market for that asset or liability, and (3) the market participants are independent, knowledgeable, and able and willing to transact an exchange. Fair value accounting and reporting establishes a framework for measuring fair value by creating a hierarchy for observable independent market inputs and unobservable market assumptions and expands disclosures about fair value measurements. Judgment is required to interpret the market data used to develop fair value estimates. As such, the estimates presented herein are not necessarily indicative of the amounts that could be realized in a current exchange. The use of different market assumptions and/or estimation methods could have a material effect on the estimated fair value. At March 31, 2025 and September 30, 2024, financial assets and liabilities measured at fair value on a recurring basis were limited to investments in marketable equity and debt securities classified as trading securities, our executive savings plan, under which certain employees are permitted to defer a portion of their base salary and/or bonus for a Plan Year (as defined in the plan), and contingent consideration liabilities related to certain of our acquisitions. Financial assets (liabilities) measured at fair value on a recurring basis as of March 31, 2025 and September 30, 2024, are summarized in the following tables by the type of inputs applicable to the fair value measurements:
| March 31, 2025
|  |  | Total Fair Value |  |  | Quoted Prices (Level 1) |  |  | Significant Unobservable Inputs (Level 3)
Marketable equity securities |  | $ | 62,339 |  |  | $ | 62,339 |  |  | $ | — |
Marketable debt securities |  |  | 3,509 |  |  |  | 3,509 |  |  |  | — |
Executive savings plan assets |  |  | 932 |  |  |  | 932 |  |  |  | — |
Executive savings plan liabilities |  |  | (803) |  |  |  | (803) |  |  |  | — |
Contingent consideration liability |  |  | (4,146) |  |  |  | — |  |  |  | (4,146) |
Total |  | $ | 61,831 |  |  | $ | 65,977 |  |  | $ | (4,146) |
| September 30, 2024
|  |  | Total Fair Value |  |  | Quoted Prices (Level 1) |  |  | Significant Unobservable Inputs (Level 3)
Marketable equity securities |  | $ | 31,639 |  |  | $ | 31,639 |  |  | $ | — |
Marketable debt securities |  |  | 3,364 |  |  |  | 3,364 |  |  |  | — |
Executive savings plan assets |  |  | 986 |  |  |  | 986 |  |  |  | — |
Executive savings plan liabilities |  |  | (852) |  |  |  | (852) |  |  |  | — |
Contingent consideration liability |  |  | (3,468) |  |  |  | — |  |  |  | (3,468) |
Total |  | $ | 31,669 |  |  | $ | 35,137 |  |  | $ | (3,468) |
On April 1, 2024, we entered into a contingent consideration arrangement under which we are obligated to pay up to $5,000 upon achievement of certain future earnings targets in connection with the acquisition of Greiner Industries, Inc. (“Greiner”) valued at $2,790 on the acquisition date. The fair value of this liability, which was included in “Other non-current liabilities” in our Condensed Consolidated Balance Sheets, is measured on a recurring basis classified within Level 3 of the fair value hierarchy. Net adjustments to its fair value were included in “Contingent consideration” in our Condensed Consolidated Statements of Comprehensive Income. The table below presents the change in fair value of liabilities measured using significant unobservable inputs (Level 3).
|  | Contingent consideration liability |
Fair value at September 30, 2024 |  | $ | (3,468) |  |
Net adjustments to fair value included in “Contingent consideration” |  | (678) |  |
Fair value at March 31, 2025 |  | $ | (4,146) |  |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | Investments in Marketable Securities Investments in marketable equity and debt securities classified as trading securities, which were included in “Marketable securities” in our Condensed Consolidated Balance Sheets, are measured at fair value on a recurring basis and classified within Level 1 of the fair value hierarchy, because we use quoted prices of identical assets in active markets. For more information, refer to Note 9, “Fair Value Measurements.” The balance of our marketable securities was as follows:
| March 31, 2025 |  | September 30, 2024
Marketable equity securities | $ | 62,339 |  |  | $ | 31,639 |
Marketable debt securities | 3,509 |  |  | 3,364 |
Marketable securities | $ | 65,848 |  |  | $ | 35,003 |
Gains and losses to measure our investments in marketable equity and debt securities at fair value were included in “Other income, net” on our Condensed Consolidated Statements of Comprehensive Income. 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,
| 2025 |  | 2024 |  | 2025 |  | 2024
Unrealized gain (loss) on marketable equity securities | $ | 5,547 |  |  | $ | (1,852) |  |  | $ | 7,862 |  |  | $ | (1,852) |
Unrealized gain (loss) on marketable debt securities | (66) |  |  | (57) |  |  | (33) |  |  | 62 |
Total unrealized gain (loss) on trading securities | $ | 5,481 |  |  | $ | (1,909) |  |  | $ | 7,829 |  |  | $ | (1,790) |
All of our debt securities classified as trading securities at March 31, 2025 mature after one year and before five years.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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