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SENIOR CONVERTIBLE NOTES (Details 2)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2018
USD ($)
$ / shares
Jul. 31, 2017
USD ($)
Jul. 31, 2018
USD ($)
$ / shares
Jul. 31, 2017
USD ($)
Jan. 31, 2018
USD ($)
SENIOR CONVERTIBLE NOTES          
Repayments of Convertible Debt     $ 20,025 $ 19,340  
Convertible notes          
Principal value $ 45,644   45,644   $ 65,644
Coupon interest expense 2,490 $ 2,464 4,520 4,584  
Convertible Notes          
Convertible notes          
Principal value 45,644   45,644   65,644
Unamortized debt discount (1,061)   (1,061)   (2,497)
Unamortized debt issuance costs (139)   (139)   (328)
Carrying value of senior convertible notes 44,444   44,444   62,819
Carrying value of equity component, net of deferred taxes $ 14,923   $ 14,923   $ 14,923
Conversion rate     0.0231626    
Conversion price (per share of common stock) | $ / shares $ 43.17   $ 43.17    
Coupon interest expense $ 546 708 $ 1,151 1,491  
Amortization of debt discount 446 540 915 1,111  
Amortization of transaction costs 59 74 123 154  
Interest Expense $ 1,051 $ 1,322 $ 2,189 $ 2,756  
Remaining period over which unamortized debt discount will be amortized     9 months    
Effective interest rate (as a percent) 7.30% 7.30% 7.30% 7.30%