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Investments, Equity Method and Joint Ventures | 6 Months Ended
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Mar. 31, 2025
Equity Method Investments and Joint Ventures [Abstract] |
Equity Method Investments and Joint Ventures Disclosure | Equity Method Investments On December 2, 2024, we paid $44,900 to acquire a 12.5% membership interest in Jett Texas Company LLC (“Jett”), an investment company, as part of the financing of Jett's investment in the CB&I storage solutions business, a designer and builder of storage facilities, tanks and terminals for energy and industrial markets, formerly owned by McDermott International, Ltd. Our investment, which was included in “Investments” on our Condensed Consolidated Balance Sheets, is measured using the equity method of accounting, wherein the carrying value of our investment is initially recorded at cost basis and subsequently adjusted for our proportionate share of earnings or losses, additional investments, and distributions. We recorded no earnings or loss on our investment in Jett in the three and six months ended March 31, 2025 and the carrying value of our investment in Jett was $44,900 at March 31, 2025.
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 equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 740 -SubTopic 323 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/740-323-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Topic 323 -Publisher FASB -URI https://asc.fasb.org/323/tableOfContent + Details
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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/940-320/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph b -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/320/tableOfContent Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-10 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/942-320/tableOfContent + Details
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