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Other Assets - Narrative (Details)
$ in Millions
Apr. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortization expense for remainder of fiscal 2018 $ 0.6
Amortization expense for 2019 0.7
Amortization expense for 2020 0.1
Amortization expense for 2021 0.1
Amortization expense after 2021, through 2023 $ 0.1