Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax expense (benefit)	$ (1,704)	$ 17,792	$ (3,204)	$ 17,622
Income (Loss) before income taxes	$ 4,228	$ 6,206	$ 8,545	$ 10,123
Effective tax rate (percent)	40.30%		37.50%
Accounting Standards Update 2016-09 [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized excess tax benefits reversed	$ 172		$ 172