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Financing Arrangements - Future minimum lease payments under non-cancelable operating leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Operating Leased Assets [Line Items]      
Operating Leases, Total Rent and Lease Expense $ 2,897 $ 2,104 $ 2,028
Minimum lease payments      
2019 2,213    
2020 1,939    
2021 728    
2022 356    
2023 140    
Thereafter $ 0