Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2012	Jan. 31, 2012	Jul. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 10,353	$ 11,772	$ 12,400
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	126,638	126,676	128,164
Common Stock, shares outstanding	126,638	126,676	128,164