Annual report pursuant to Section 13 and 15(d)

Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details)

v3.8.0.1
Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Components of deferred tax assets and liabilities    
Costs deductible in future periods $ 30,794 $ 27,738
Deferred revenue 20,703 23,469
Stock compensation 4,976 5,085
Net operating loss carryforwards 360 1,291
Amortization of goodwill and intangible assets (36,100) (34,484)
Capitalized software (9,197) (10,126)
Accounts receivable - unbilled (12,953) (13,810)
Property and equipment (3,924) (5,517)
Prepaid expenses (3,741) (1,296)
Other (3,333) (519)
Net deferred tax liabilities $ (12,415) $ (8,169)