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Commitments and Contingencies - Summary of Purchase Commitments (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Fiscal 2018 $ 56.4
Fiscal 2019 4.7
Fiscal 2020 1.1
Fiscal 2021 1.1
Fiscal 2022 1.1
Total $ 64.4