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Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Components of deferred tax assets and liabilities |  |
Costs deductible in future periods | $ 20,254 | $ 30,794
Deferred revenue | 5,197 | 20,703
Stock compensation | 3,469 | 4,976
Net operating loss carryforwards | 302 | 360
Amortization of goodwill and intangible assets | (27,054) | (36,100)
Capitalized software | (6,016) | (9,197)
Accounts receivable - unbilled | (7,854) | (12,953)
Property and equipment | (2,011) | (3,924)
Prepaid expenses | (2,927) | (3,741)
Other | (2,903) | (3,333)
Net deferred tax liabilities | $ (19,543) | $ (12,415)

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