Dividends and Treasury Stock (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Jan. 31, 2015
Stockholders' Equity Note [Abstract]
Stock Repurchase Program, Authorized Amount	$ 75,000,000		$ 75,000,000		$ 40,000,000
Shares repurchased, Treasury Stock	102,477	0	163,177	0
Payments for Repurchase of Common Stock	$ 3,500,000	$ 0	$ 5,781,000	$ 0
Unpaid repurchases of common stock	0	$ 0	0	$ 0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 22,179,000		$ 22,179,000