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LONG-TERM DEBT - Components of Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2022
Jul. 31, 2021
Apr. 09, 2021
Jun. 18, 2014
2021 Notes            
Debt Instrument [Line Items]            
Interest expense at coupon or contractual rate $ 197 $ 197 $ 392 $ 245    
Amortization of deferred debt issuance costs 440 437 879 542    
Total interest expense 637 634 1,271 787    
Coupon interest rate         0.25%  
2014 Notes            
Debt Instrument [Line Items]            
Interest expense at coupon or contractual rate 0 482 0 1,933    
Amortization of deferred debt issuance costs 0 131 0 522    
Total interest expense 0 613 0 2,455    
Coupon interest rate           1.50%
Credit Agreement            
Debt Instrument [Line Items]            
Interest expense at coupon or contractual rate 813 537 1,373 2,297    
Impact of interest rate swap reclassified from accumulated other comprehensive loss 0 0 0 1,014    
Amortization of debt discounts 4 5 9 8    
Amortization of deferred debt issuance costs 217 223 428 495    
Total interest expense $ 1,034 $ 765 $ 1,810 $ 3,814