LONG-TERM DEBT LONG-TERM DEBT - CREDIT AGREEMENT INTEREST RATE DETAILS - 2013 AMENDMENTS (Details) (2013 Amended Credit Agreement)	6 Months Ended		6 Months Ended
	Jul. 31, 2014 Eurodollar loans	Apr. 30, 2014 March 2013 Term Loans	Jul. 31, 2014 Adjusted LIBO Rate Eurodollar loans	Jul. 31, 2014 Adjusted LIBO Rate Base Rate loans	Jul. 31, 2014 Base Rate Base Rate loans	Jul. 31, 2014 Federal Funds Effective Rate Base Rate loans	Jul. 31, 2014 Corporate Credit Ratings of BB- and Ba3 or Better Base Rate loans	Jul. 31, 2014 Corporate Credit Ratings of BB- and Ba3 or Better Adjusted LIBO Rate Eurodollar loans
Debt Instrument
Interest period (in months)	3 months			1 month
Variable rate basis			Adjusted LIBO Rate		Base Rate	Federal Funds Effective Rate
Interest rate margin (as a percent)			3.00%	1.00%	2.00%	0.50%	1.75%	2.75%
Rate used to calculate reference rate (as a percent)			1.00%
Interest rate at end of period (as a percent)		4.00%