LONG-TERM DEBT LONG-TERM DEBT - 2017 CREDIT AGREEMENT ISSUANCE COSTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Debt Instrument [Line Items]
Payments of Debt Issuance Costs	$ 7,137	$ 249	$ 239
2017 Credit Agreement
Debt Instrument [Line Items]
Payments of Debt Issuance Costs	6,800
2017 Term Loan
Debt Instrument [Line Items]
Payments of Debt Issuance Costs	4,100
2017 Revolving Credit Facility
Debt Instrument [Line Items]
Payments of Debt Issuance Costs	$ 2,700