LONG-TERM DEBT LONG-TERM DEBT - PRIOR CREDIT AGREEMENT - SUMMARY (Details) - USD ($)	Jun. 29, 2017	Jun. 18, 2014	Jan. 31, 2018	Jan. 31, 2017	Mar. 07, 2014	Feb. 03, 2014
Debt Instrument [Line Items]
Common stock issued in public offering (in shares)		5,750,000
Prior Credit Agreement (as amended)
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 943,500,000
February 2014 Term Loans
Debt Instrument [Line Items]
Long-term Debt, Gross			0	$ 130,060,000		$ 300,000,000
March 2014 Term Loans
Debt Instrument [Line Items]
Long-term Debt, Gross			0	$ 278,978,000	$ 643,500,000
Prior Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 300,000,000
Proceeds from (Repayments of) Secured Debt		$ 106,000,000
2014 Term Loans
Debt Instrument [Line Items]
Proceeds from (Repayments of) Secured Debt	$ 406,900,000	$ 530,000,000