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, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense on intangible assets $ 9,509 $ 8,249 $ 17,622 $ 14,930
Future amortization expense [Abstract]        
Future amortization expense for the remainder 2019 19,565   19,565  
Future amortization expense 2020 37,226   37,226  
Future amortization expense 2021 35,753   35,753  
Future amortization expense 2022 34,112   34,112  
Future amortization expense 2023 $ 32,504   $ 32,504