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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025
Derivatives, Fair Value [Line Items] |  |  |
Transfers into or out of Level 3 | $ 0 | $ 0 |
Change in fair value | 0 | $ 0 |
Nonrecurring [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Liabilities measured at fair value | 0 |  |
Cell C [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Investment amount owned | $ 0.0 |  | $ 0.0
Equity method investment, percentage of ownership interest | 0.00% |  |
Cell C [Member] | Marketability Discount [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Investment fair value measurement inputs | 15.00% |  | 15.00%
Cell C [Member] | Minority Discount [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Investment fair value measurement inputs | 17.00% |  | 17.00%
Cell C [Member] | Weighted Average Cost of Capital (WACC) Rate [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Increase decrease in weighted average cost of capital | (2.50%) |  |
Investment fair value measurement inputs | 23.00% |  | 24.00%
Cell C [Member] | Measurement Input Ebitda Multiple [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Increase decrease in weighted average cost of capital | 2.50% |  |
Cell C [Member] | Class A [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Investment shares owned | 75,000,000 |  |
Cell C [Member] | Class A [Member] | Marketability Discount [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Investment fair value measurement inputs | 15.00% |  |
Cell C [Member] | Class A [Member] | Minority Discount [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Investment fair value measurement inputs | 17.00% |  |

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- Definition Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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