Debt - Schedule of Debt Instruments (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Sep. 30, 2025 |
Jun. 30, 2025 |
|---|---|---|---|
| Debt Instrument [Line Items] | |||
| Gross Amount | $ 530,000 | $ 530,000 | $ 530,000 |
| Deferred Financing Costs | (10,506) | (11,924) | (12,399) |
| Carrying Amount | 519,494 | 518,076 | 517,601 |
| 2032 Senior Notes | Senior Notes | |||
| Debt Instrument [Line Items] | |||
| Gross Amount | 300,000 | 300,000 | 300,000 |
| Deferred Financing Costs | (6,527) | (7,182) | (7,381) |
| Carrying Amount | 293,473 | 292,818 | 292,619 |
| 2029 Convertible Notes | Senior Notes | |||
| Debt Instrument [Line Items] | |||
| Gross Amount | 230,000 | 230,000 | 230,000 |
| Deferred Financing Costs | (3,979) | (4,742) | (5,018) |
| Carrying Amount | $ 226,021 | $ 225,258 | $ 224,982 |
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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