Stockholders' Equity - Textuals (Details) - shares	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Stockholders' Equity [Abstract]
Common stock, shares issued	1,651	13,276	7,651	19,276
Treasury stock, shares utilized of equity awards	148,025	12,738	356,550	47,253