CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2019
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts, accrued returns and sales discounts on accounts receivable (in dollars)	$ 2.1	$ 0.9
Accrued returns	61.2
Sales discounts	$ 102.1
Preferred stock, shares authorized	1,000,000	1,000,000
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	120,000,000	120,000,000
Common stock, shares issued	49,219,000	49,387,000
Treasury stock, shares	106,000	678,000