LONG-TERM DEBT LONG-TERM DEBT - 2017 CREDIT AGREEMENT - INTEREST RATE DETAILS (Details)	12 Months Ended
	Jan. 31, 2018
Variable Rate Based on Eurodollar Rate | 2017 Credit Agreement | Eurodollar loans
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	Eurodollar Rate
Variable Rate Based on Eurodollar Rate | 2017 Term Loan | Eurodollar loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Variable Rate Based on Eurodollar Rate | 2017 Term Loan - Following January 2018 Amendment | Eurodollar loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Variable Rate Based on ABR Rate | 2017 Credit Agreement | ABR Rate Loans
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	ABR rate
Variable Rate Based on ABR Rate | 2017 Term Loan | ABR Rate Loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Variable Rate Based on ABR Rate | 2017 Term Loan - Following January 2018 Amendment | ABR Rate Loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%