Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data	Jul. 31, 2011	Jan. 31, 2011	Jul. 31, 2010
Current assets:
Allowance for Doubtful Accounts Receivable, Current	$ 12,400	$ 11,783	$ 12,326
Stockholders' equity:
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	128,164	126,969	126,488
Common Stock, shares outstanding	128,164	126,969	126,488