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Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Deferred tax assets/(liabilities): |  |
Costs deductible in future periods | $ 28,921 | $ 24,127
Deferred revenue | 7,878 | 8,054
Stock compensation | 3,679 | 4,140
Net operating loss carryforwards | 418 | 252
Amortization of goodwill and intangibles | (203,094) | (27,555)
Capitalized software | (11,343) | (10,076)
Accounts receivable - unbilled | (15,317) | (11,565)
Property and equipment | (910) | (2,365)
Prepaid expenses | (7,913) | (4,245)
Other | 4,033 |
Other |  | (3,589)
Net deferred tax liability | $ (193,648) | $ (22,822)

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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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