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RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Jan. 31, 2016
Recently issued accounting pronouncements          
Income tax expense (benefit) $ 11,756 $ 7,939 $ 18,928 $ 12,800  
Deferred income tax liabilities, noncurrent         $ 224
Accounting Standards Update ('ASU') 2016-09 - Reduction in income tax expense: Improvements to Employee Share-Based Payment Accounting | Adjustment          
Recently issued accounting pronouncements          
Income tax expense (benefit) $ (1,000)   $ (1,100)    
Accounting Standards Update ("ASU") 2015-17 - Income Taxes: Balance Sheet Classification of Deferred Taxes | Retrospective early adoption          
Recently issued accounting pronouncements          
Deferred income tax liabilities, noncurrent         (1,100)
Deferred tax assets, Current         $ (1,100)