Fair Value Measurements - Narrative (Details) - USD ($) |
Mar. 31, 2026 |
Sep. 30, 2025 |
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| Fair Value Disclosures [Abstract] | ||
| Allowance for credit losses | $ 0 | |
| Cost basis | $ 48,400,000 | $ 42,500,000 |
| X | ||||||||||
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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