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Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
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Components of deferred tax assets and liabilities |  |
Costs deductible in future periods | $ 19,133 | $ 20,254
Deferred revenue | 6,098 | 5,197
Stock compensation | 3,617 | 3,469
Net operating loss carryforwards | 798 | 302
Amortization of goodwill and intangible assets | (26,338) | (27,054)
Capitalized software | (8,635) | (6,016)
Accounts receivable - unbilled | (35,566) | (7,854)
Property and equipment | 515 |
Property and equipment |  | (2,011)
Prepaid expenses | (3,645) | (2,927)
Other | (2,351) | (2,903)
Net deferred tax liabilities | $ (46,374) | $ (19,543)

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