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Debt (Narrative) (Details) |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Jan. 18, 2024 USD ($) | Jul. 05, 2023 day | Oct. 01, 2020 day | Jun. 18, 2020 USD ($) $ / shares | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Secured term loan facility |  |  |  |  |  | $ 320,280,000 |  | $ 320,280,000 |  | $ 312,045,000
Payments of debt issuance costs |  |  |  |  |  |  |  | 10,044,000 | $ 0 |
Interest expense |  |  |  |  |  | 8,400,000 | $ 6,600,000 | 24,500,000 | 19,100,000 |
Non-cash debt extinguishment expense |  |  |  |  |  | 0 | 0 | 3,669,000 | 0 |
Current portion of long-term debt |  |  |  |  |  | 99,698,000 |  | 99,698,000 |  | 1,451,000
Long-term debt |  |  |  |  |  | 313,968,000 |  | 313,968,000 |  | 306,982,000
For Period from Second Quarter To Fourth Quarter of Fiscal Year 2024 | Secured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, net leverage ratio |  | 6.25 |  |  |  |  |  |  |  |
From First Quarter of Fiscal Year 2025 and Thereafter | Secured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, net leverage ratio |  | 5.75 |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Secured term loan facility |  |  |  |  |  | 0 |  | 0 |  | 211,500,000
Credit Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | 7,100,000 |  | 19,800,000 |  |
Credit Facility | Non-cash Amortization of Debt Issuance Costs |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | 358,000 |  | 997,000 |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  |  |  |  | $ 100,000,000.0 |  |  |  |  |
Secured term loan facility |  |  |  |  |  | 100,000,000 |  | 100,000,000 |  | 100,000,000
Interest expense |  |  |  |  |  | 1,200,000 | $ 1,200,000 | 3,700,000 | $ 3,700,000 |
Unamortized debt issuance costs |  |  |  |  |  | $ 582,000 |  | $ 582,000 |  | 1,100,000
Interest rate on amounts borrowed |  | 4.25% |  |  | 4.25% |  |  |  |  |
Effective interest rate |  |  |  |  |  | 5.05% |  | 5.05% |  |
Proceeds from issuance of convertible debt |  |  |  |  | $ 96,500,000 |  |  |  |  |
Conversion ratio |  |  |  |  | 0.0426203 |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 23.46 |  |  |  |  |
Debt fair value |  |  |  |  |  | $ 125,400,000 |  | $ 125,400,000 |  |
Convertible Senior Notes | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt |  |  |  |  |  | 100,000,000.0 |  | 100,000,000.0 |  |
Long-term debt |  |  |  |  |  |  |  |  |  | $ 100,000,000.0
Convertible Senior Notes | Circumstance I |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion trading day threshold | day |  |  |  | 20 |  |  |  |  |  |
Conversion consecutive trading day threshold | day |  |  |  | 30 |  |  |  |  |  |
Conversion percentage of stock price threshold |  |  |  | 130.00% |  |  |  |  |  |
Convertible Senior Notes | Circumstance II |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion trading day threshold | day |  |  |  | 5 |  |  |  |  |  |
Conversion consecutive trading day threshold | day |  |  |  | 5 |  |  |  |  |  |
Conversion percentage of stock price threshold |  |  |  | 98.00% |  |  |  |  |  |
Convertible Senior Notes | Circumstance After July 5, 2023 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion trading day threshold | day |  |  | 20 |  |  |  |  |  |  |
Conversion consecutive trading day threshold | day |  |  | 30 |  |  |  |  |  |  |
Conversion percentage of stock price threshold |  |  | 130.00% |  |  |  |  |  |  |
Conversion percentage of principal amount |  |  | 100.00% |  |  |  |  |  |  |
Convertible Senior Notes | Prior to Maturity |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Periodic payment, principal |  |  |  |  |  |  |  | 0 |  |
Credit and Guaranty Agreement | Secured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  | $ 350,000,000 |  |  |  |  |  |  |  |
Initial Term Loan Facility | Secured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  | 190,000,000 |  |  |  |  |  |  |  |
Secured term loan facility |  | 190,000,000 |  |  |  |  |  |  |  |
Payments of debt issuance costs |  |  |  |  |  |  |  | 6,500,000 |  |
Unamortized debt issuance costs |  |  |  |  |  | 5,700,000 |  | 5,700,000 |  |
Delayed Draw Term Loan Facility | Secured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  | $ 100,000,000 |  |  |  |  |  |  |  |
Debt issuance costs, net |  |  |  |  |  | $ 3,700,000 |  | $ 3,700,000 |  |
Commitment fee percentage |  | 1.00% |  |  |  |  |  |  |  |
Revolving Credit Facility | Secured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  | 9.28% |  | 9.28% |  |
Revolving Credit Facility | Secured Debt | Base Rate |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate on amounts borrowed |  | 3.00% |  |  |  |  |  |  |  |
Revolving Credit Facility | Secured Debt | SOFR |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate on amounts borrowed |  | 4.00% |  |  |  |  |  |  |  |
Revolving Credit Facility | Secured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  | $ 60,000,000 |  |  |  |  |  |  |  |
Debt instrument, unused borrowing capacity, amount |  | 30,000,000 |  |  |  |  |  |  |  |
Secured term loan facility |  | $ 30,000,000 |  |  |  |  |  |  |  |
Debt issuance costs, net |  |  |  |  |  | $ 3,700,000 |  | $ 3,700,000 |  |
Commitment fee percentage |  | 0.50% |  |  |  |  |  |  |  |
Revolving Credit Facility | Secured Debt | If Prepayment Occurs Prior To January 18, 2025 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt prepayment premium |  | 5.00% |  |  |  |  |  |  |  |
Revolving Credit Facility | Secured Debt | If Prepayment Occurs After January 18, 2025 And Prior To January 18, 2026 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt prepayment premium |  | 1.00% |  |  |  |  |  |  |  |
Term Loan Facilities | Secured Debt | Base Rate |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility margin |  | 5.50% |  |  |  |  |  |  |  |
Term Loan Facilities | Secured Debt | SOFR |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility margin |  | 6.50% |  |  |  |  |  |  |  |
Term Loan Facilities | Secured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Non-cash debt extinguishment expense |  |  |  |  |  |  |  | $ 3,700,000 |  |
Effective interest rate |  |  |  |  |  | 11.78% |  | 11.78% |  |
Term Loan Facilities | Secured Debt | Forecast |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, net leverage ratio | 3.75 |  |  |  |  |  |  |  |  |
Term Loan Facilities | Secured Debt | If Certain Conditions Are Met After Q2, 2025 | Forecast |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Decrease in basis spread on variable rate | 25 |  |  |  |  |  |  |  |  |
Term Loan Facilities | Secured Debt | If Certain Conditions Are Met After Q2, 2025 | Base Rate | Forecast |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility margin | 5.25% |  |  |  |  |  |  |  |  |
Term Loan Facilities | Secured Debt | If Certain Conditions Are Met After Q2, 2025 | SOFR | Forecast |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility margin | 6.25% |  |  |  |  |  |  |  |  |

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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