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Goodwill and Other Intangible Assets - Future Amortization Expense of Other Intangible Assets (Details) - USD ($)
$ in Thousands
Jul. 31, 2017
Jan. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 (remaining six months) $ 1,817  
2019 3,221  
2020 3,111  
2021 3,092  
2022 2,996  
Thereafter 3,284  
Net Carrying Amount $ 17,521 $ 5,848