CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jul. 31, 2013	Jan. 31, 2013	Jul. 31, 2012
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 38,285	$ 45,947	$ 28,747
Preferred stock, shares authorized	1,000,000	1,000,000	1,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	80,000,000	80,000,000	80,000,000
Common stock, shares issued	20,889,322	20,616,957	20,524,429
Treasury stock, shares	492,225	492,225	492,225