LONG-TERM DEBT LONG-TERM DEBT - FEES (Details) (USD $)	12 Months Ended							12 Months Ended		3 Months Ended		12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Mar. 06, 2013 2013 Amended Credit Agreement	Jan. 31, 2014 2013 Amended Credit Agreement Term loans	Mar. 06, 2013 2013 Amended Credit Agreement Term loans	Jan. 31, 2013 2013 Amended Credit Agreement Term loans	Jan. 31, 2014 2013 Amended Credit Agreement Revolving credit facility	Mar. 06, 2013 2013 Amended Credit Agreement Revolving credit facility	Apr. 30, 2013 2011 Credit Agreement	Mar. 06, 2013 2011 Credit Agreement	Jan. 31, 2014 2011 Credit Agreement Term loans	Mar. 06, 2013 2011 Credit Agreement Term loans	Jan. 31, 2013 2011 Credit Agreement Term loans	Apr. 30, 2011 2011 Credit Agreement Term loans	Mar. 06, 2013 2011 Credit Agreement Revolving credit facility
Debt Instrument
Unamortized deferred costs				$ 7,500,000		$ 5,000,000			$ 2,500,000		$ 11,000,000		$ 7,500,000			$ 3,500,000
Unamortized term loan discount					2,827,000	3,300,000	0					0	2,200,000	2,199,000	3,000,000
Loss on extinguishment of debt	$ (9,879,000)	$ 0	$ (8,136,000)							$ 9,700,000		$ (9,700,000)
Commitment fee on undrawn portion (as a percent)								0.50%