DEBT AND FINANCING ARRANGEMENTS (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2015	Jan. 31, 2015
Debt and financing arrangements
Long-term debt	$ 194,500	$ 213,000
Current maturities	(2,000)	(2,000)
Long-term debt less current maturities	192,500	211,000
Vendor financing program
Trade payable program liability	127,765	140,904
Long-term debt estimated fair value	194,500	211,000
Senior Secured Term Loan, due October 2018
Debt and financing arrangements
Long-term debt	194,500	196,000
Revolving Credit Agreement, through July 2016
Debt and financing arrangements
Long-term debt	0	17,000
Maximum borrowing facility	300,000
Outstanding letters of credit	39,600
Available borrowing capacity remaining	$ 147,800
Revolving Credit Agreement, through July 2016 | Minimum
Debt and financing arrangements
Minimum borrowing availability required to prevent the triggering of an EBITDA requirement covenant	50,000,000
Vendor financing program
Vendor financing program
Trade payable program availability	$ 200,000
Trade payable program liability	$ 127,800	$ 140,900