Dividends and Treasury Stock (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 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	169,474	0	332,651	0
Payments for Repurchase of Common Stock	$ 5,000,000	$ 0	$ 10,781,000	$ 0
Unpaid repurchases of common stock	0	0	0	0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	17,179,000		17,179,000
Payments of Ordinary Dividends, Common Stock	$ 4,648,000	$ 4,674,000	$ 14,001,000	$ 14,000,000