CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) shares in Thousands, $ in Millions	Jan. 31, 2020	Jan. 31, 2019
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts, accrued returns and sales discounts on accounts receivable (in dollars)	$ 0.7	$ 0.9
Preferred stock, shares authorized	1,000	1,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	120,000	120,000
Common stock, shares issued	49,396	49,387
Treasury stock, shares	1,386	678