v3.21.1
Basis of presentation (Details) - USD ($)
$ in Thousands
Jan. 31, 2021
Jan. 31, 2020
Reclassifications [Line Items]    
Long-term debt and finance lease liabilities $ 4,864 $ 2,324
Reclassification from current finance lease liabilities (3,820)  
Long term debt and finance lease liabilities 6,471 21,540
Reclassification of long-term finance leases (5,882)  
Revision of Prior Period, Adjustment    
Reclassifications [Line Items]    
Long-term debt and finance lease liabilities   2,300
Reclassification from current finance lease liabilities   2,300
Long term debt and finance lease liabilities $ 2,100  
Reclassification of long-term finance leases   $ 2,100