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Debt - Narrative (Details) - USD ($) $ in Thousands | 4 Months Ended | 8 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 | May 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 07, 2023 | Dec. 22, 2021
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 215,000
Weighted average interest rate on debt |  |  | 6.00% |  |  |  |
Debt issuance costs |  |  |  |  |  | $ 9,700 |
Debt instrument, basis spread on variable rate | 1.75% | 2.25% |  |  |  |  |
Proceeds from long-term debt |  |  | $ 150,000 | $ 214,062 | $ 0 |  |
Payment for Debt Extinguishment or Debt Prepayment Cost |  |  |  | 18,900 |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.20% |  |  |  |
Repayments of Debt |  |  | $ 114,300 | $ 91,100 |  |  |
Line of Credit Facility, Increase (Decrease), Net |  |  | $ 150,000 |  |  |  |
Credit Agreement [Domain] | Line of Credit |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio, Minimum |  |  | 3 |  |  |  |
Debt Instrument, Covenant, Liquidity Ratio, Total Net Leverage Ratio |  |  | 3 |  |  |  |
Debt Instrument, Covenant, Holiday |  |  | 3.5 |  |  |  |
Total Net Leverage Ratio, Unrestricted Cash, Maximum |  |  | $ 50,000 |  |  |  |
2021 Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | 1,300 |
Secured Debt [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 350,000
Secured Debt [Member] | Base Rate | Federal Funds Rate |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 0.50% |  |  |  |
Secured Debt [Member] | Base Rate | LIBOR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 1.00% |  |  |  |
Secured Debt [Member] | Minimum | Base Rate |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Basis for Effective Rate |  |  | 0.00 |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 250,000 | 35,000
Line Of Credit Facility, Accordion Feature, Increase Limit |  |  |  |  |  | 95,000 |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.20% |  |  |  |
Revolving Credit Facility | Minimum | Base Rate |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 0.75% |  |  |  |
Revolving Credit Facility | Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 1.75% |  |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.35% |  |  |  |
Revolving Credit Facility | Maximum | Base Rate |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 1.75% |  |  |  |
Revolving Credit Facility | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 2.75% |  |  |  |
Letter of Credit |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 10,000 | 10,000
Swingline Subfacility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 10,000

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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482900/835-30-50-1 + Details
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