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Debt - Schedule of Future Principal Repayments of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jan. 31, 2018
Jan. 31, 2017
Debt Instrument [Line Items]    
Deferred finance costs $ 128 $ 199
Senior Notes    
Debt Instrument [Line Items]    
Debt Payments Due by 2018 597  
Debt Payments Due by 2019 4,029  
Long-term Debt $ 4,626