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Debt - Schedule of Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Debt Disclosure [Abstract]    
2019 $ 575,000  
2020 0  
2021 0  
2022 0  
2023 0  
Thereafter 2,510,000  
Total long-term debt $ 3,085,000 $ 3,085,000