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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Goodwill [Line Items] |  |  |
Amortization of intangible assets | $ 3,048 | $ 31 | $ 37
Amortization of intangible assets to be recognized in 2025 | 4,675 |  |
Amortization of intangible assets to be recognized in 2026 | 3,607 |  |
Amortization of intangible assets to be recognized in 2027 | 3,076 |  |
Amortization of intangible assets to be recognized in 2028 | 3,075 |  |
Amortization of intangible assets to be recognized in 2029 and thereafter | 691 |  |
MPC Partnership Holdings LLC |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Acquired During Period | $ 69,902 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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