Business and Summary of Significant Accounting Policies Business and Summary of Significant Accounting Policies (Unusual or Infrequent Items) (Details) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Oct. 31, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Unusual or Infrequent Item [Line Items]
Operating Expenses, Restatement and Remediation Related		$ 2,300	$ 2,100	$ 5,400	$ 12,200	$ 829	$ 22,043	$ 53,791
Gain (Loss) Related to Litigation Settlement	$ 5,100	$ 35,400	$ 3,000	$ 21,500	$ 38,500	$ 98,433	$ 5,059	$ 35,511