Stockholders' Equity - Textuals (Details) - shares	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Stockholders' Equity [Abstract]
Common stock, shares issued	0	0	0	0
Treasury stock, shares utilized of equity awards	189,313	307,147	189,471	349,342