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Recent accounting pronouncements (Details) - USD ($)
$ in Thousands
9 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Jan. 31, 2016
New Accounting Pronouncement, Early Adoption [Line Items]      
Net Cash Provided by (Used in) Operating Activities $ 143,706 $ 122,276  
Net Cash Provided by (Used in) Financing Activities $ (163,317) (34,580)  
Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncement, Early Adoption [Line Items]      
Deferred Tax Assets, Gross     $ 48,605
Deferred tax assets valuation allowance     38,425
Cumulative Effect of New Accounting Principle in Period of Adoption     $ 10,180
Scenario, Previously Reported [Member]      
New Accounting Pronouncement, Early Adoption [Line Items]      
Net Cash Provided by (Used in) Operating Activities   119,846  
Net Cash Provided by (Used in) Financing Activities   $ (32,150)