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Accounting Pronouncements Recently Adopted (Details) - USD ($)
$ in Thousands
Jul. 31, 2018
Jan. 31, 2018
Jul. 31, 2017
Jan. 31, 2017
Changes To Critical Accounting Policies [Line Items]        
Cash and cash equivalents $ 175,583 $ 214,811 $ 162,417  
ASU 2016-18        
Changes To Critical Accounting Policies [Line Items]        
Cash and cash equivalents   214,811   $ 256,279
Restricted funds included in other non-current assets   $ 600   $ 600
Restricted Cash, Noncurrent, Asset, Statement of Financial Position [Extensible List]   us-gaap:OtherNoncurrentAssetsMember   us-gaap:OtherNoncurrentAssetsMember
Beginning of period balance presented in the statement of cash flows   $ 215,411   $ 256,879
ASU 2016-18 | As Previously Reported        
Changes To Critical Accounting Policies [Line Items]        
Cash and cash equivalents   $ 214,811   $ 256,279
Restricted Cash, Noncurrent, Asset, Statement of Financial Position [Extensible List]   us-gaap:OtherNoncurrentAssetsMember   us-gaap:OtherNoncurrentAssetsMember
Beginning of period balance presented in the statement of cash flows   $ 214,811   $ 256,279