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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Deferred tax assets/(liabilities): |  |
Costs deductible in future periods | $ 42,856 | $ 37,036
Deferred revenue | 10,459 | 8,712
Stock compensation | 7,482 | 6,212
Capital loss carryforward | 7,872 | 2,391
Net operating loss carryforwards | 35,492 | 33,278
Amortization of goodwill and intangibles | (183,406) | (189,316)
Capitalized software | (23,661) | (28,246)
Accounts receivable - unbilled | (4,731) | (7,963)
Property and equipment | 1,286 |
Property and equipment |  | (3,437)
Prepaid expenses | (11,696) | (10,906)
Financial instruments | (2,413) | (8,158)
Valuation allowance | (31,956) | (34,643)
Other | (1,901) | (6,399)
Net deferred tax liability | $ (154,317) | $ (201,439)

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- Definition The current portion of the amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the tax basis of unbilled receivables and the basis of unbilled receivables determined in accordance with generally accepted accounting principles. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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