Business and Summary of Significant Accounting Policies (Unusual or Infrequent Items) (Details) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Unusual or Infrequent Item
Restatement and remediation related expenses							$ 0	$ 829	$ 22,043
Gain (Loss) Related to Litigation Settlement	$ 3,700	$ 400	$ 35,400	$ 3,000	$ 21,500	$ 38,500	$ 4,142	$ 98,433	$ 5,059