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Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Components of deferred tax assets and liabilities |  |
Costs deductible in future periods | $ 24,127 | $ 19,133
Deferred revenue | 8,054 | 6,098
Stock compensation | 4,140 | 3,617
Net operating loss carryforwards | 252 | 798
Amortization of goodwill and intangible assets | (27,555) | (26,338)
Capitalized software | (10,076) | (8,635)
Accounts receivable - unbilled | (11,565) | (35,566)
Property and equipment | (2,365) |
Property and equipment |  | 515
Prepaid expenses | (4,245) | (3,645)
Other | (3,589) | (2,351)
Net deferred tax liabilities | $ (22,822) | $ (46,374)

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