Stockholders' Equity - Textuals (Details) - shares	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Stockholders' Equity [Abstract]
Common stock, shares issued	0	1,651	0	7,651
Treasury stock, shares utilized of equity awards	307,147	148,025	349,342	356,550