Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Narrative (Details)

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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense on intangible assets $ 5,634 $ 5,190 $ 10,575 $ 10,406
Future amortization expense [Abstract]        
Future amortization expense for the remainder 2017 11,886   11,886  
Future amortization expense 2018 21,724   21,724  
Future amortization expense 2019 20,677   20,677  
Future amortization expense 2020 19,561   19,561  
Future amortization expense 2021 $ 18,802   $ 18,802