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, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense on intangible assets $ 8,249 $ 5,634 $ 14,930 $ 10,575
Future amortization expense [Abstract]        
Future amortization expense for the remainder 2018 17,070   17,070  
Future amortization expense 2019 32,252   32,252  
Future amortization expense 2020 30,425   30,425  
Future amortization expense 2021 29,007   29,007  
Future amortization expense 2022 $ 27,516   $ 27,516