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Goodwill and Intangible Assets - Estimated future amortization expense related to intangible assets subject to amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Estimated future amortization expense related to intangible assets subject to amortization:    
2017 $ 13,039  
2018 11,513  
2019 10,137  
2020 7,346  
2021 3,819  
Thereafter 3,183  
Net book value $ 49,037 $ 52,349
Intangible assets weighted average amortization period 4 years 7 months 6 days