LONG-TERM DEBT - PRIOR CREDIT AGREEMENT - INTEREST RATE DETAILS (Details) - Prior Credit Agreement (as amended)
3 Months Ended
Apr. 30, 2018
Adjusted LIBO Rate | Eurodollar loans  
Debt Instrument  
Variable rate basis Adjusted LIBOR Rate
Interest rate margin (as a percent) 2.75%
Base Rate | Base Rate loans  
Debt Instrument  
Variable rate basis base rate
Interest rate margin (as a percent) 1.75%