CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Jan. 31, 2020	Jan. 31, 2019
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	2,000,000.0	2,000,000.0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	750,000,000	750,000,000.0
Common stock, shares outstanding (in shares)	219,400,000.0	219,400,000.0