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Leases - Lease assets and liabilities (Details) - USD ($)
$ in Thousands
Oct. 31, 2020
Jan. 31, 2020
Oct. 31, 2019
Assets and Liabilities, Lessee [Abstract]      
Operating lease assets $ 181,187 $ 270,032 $ 293,819
Classification of operating lease assets us-gaap:OperatingLeaseRightOfUseAsset    
Total lease assets $ 181,187 270,032 293,819
Current operating lease liabilities $ 65,554 63,166 66,850
Classification current operating lease liabilities us-gaap:OperatingLeaseLiabilityCurrent    
Noncurrent operating lease liabilities $ 157,983 249,040 260,010
Classification of noncurrent operating liabilities us-gaap:OperatingLeaseLiabilityNoncurrent    
Total lease liabilities $ 223,537 $ 312,206 $ 326,860