CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Oct. 31, 2015	Jan. 31, 2015	Oct. 31, 2014
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts and sales discounts on accounts receivable (in dollars)	$ 77,606	$ 53,441	$ 60,685
Preferred stock, shares authorized	1,000,000	1,000,000	1,000,000
Preferred stock, shares issued	0	0	0
Preferred stock, shares outstanding	0	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	120,000,000	120,000,000	120,000,000
Common stock, shares issued	46,204,000	45,942,000	45,928,000
Treasury stock, shares	667,000	984,000	984,000