CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014	Jan. 31, 2014	Jul. 31, 2013
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable, current	$ 9,537	$ 10,337	$ 8,918
Preferred Stock, par value	$ 0.01	$ 0.01	$ 0.01
Preferred Stock, shares authorized	2,000	2,000	2,000
Preferred Stock, shares issued
Preferred Stock, shares outstanding
Common Stock, par value	$ 0.01	$ 0.01	$ 0.01
Common Stock, shares authorized	240,000	240,000	240,000
Common Stock, shares issued	129,295	128,312	127,945
Common Stock, shares outstanding	129,295	128,312	127,945