CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Millions	Apr. 30, 2022	Jan. 31, 2022	Apr. 30, 2021
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 16.9	$ 17.4	$ 17.5
Preferred stock, shares authorized	1,000,000	1,000,000	1,000,000
Preferred stock, shares issued	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	49,396,000	49,396,000	49,396,000
Treasury stock, shares	1,209,000	1,480,000	1,019,000